1

## C語言 遞迴

1.目的:求1 * 2 * 3 ...... * 200的值
2.問題:我是用200!求答案,可是程式不會動,想知道是什麼原因
3.程式碼:

``````# include <stdio.h>
int fun(int);
main()
{

fun(200);
printf("%d\n", fun(200));

}

int fun(int x)
{

return x * fun(x - 1);

}

``````

4.程式執行畫面

wrxue iT邦新手 1 級 ‧ 2020-09-04 21:16:45 檢舉

wrxue iT邦新手 1 級 ‧ 2020-09-04 21:40:24 檢舉

### 3 個回答

3
japhenchen
iT邦大師 1 級 ‧ 2020-09-08 07:56:55

200! 有375位數，以現有的最強大的個人電腦頂多也只能定址64位元，最大也才20位數

``````1! = 1
2! = 2
3! = 6
4! = 24
5! = 120
6! = 720
7! = 5040
8! = 40320
9! = 362880
10! = 3628800
11! = 39916800
12! = 479001600
13! = 6227020800
14! = 87178291200
15! = 1307674368000
16! = 20922789888000
17! = 355687428096000
18! = 6402373705728000
19! = 121645100408832000
20! = 2432902008176640000
21! = 51090942171709440000
22! = 1124000727777607680000
23! = 25852016738884976640000
24! = 620448401733239439360000
25! = 15511210043330985984000000
26! = 403291461126605635584000000
27! = 10888869450418352160768000000
28! = 304888344611713860501504000000
29! = 8841761993739701954543616000000
30! = 265252859812191058636308480000000
31! = 8222838654177922817725562880000000
32! = 263130836933693530167218012160000000
33! = 8683317618811886495518194401280000000
34! = 295232799039604140847618609643520000000
35! = 10333147966386144929666651337523200000000
36! = 371993326789901217467999448150835200000000
37! = 13763753091226345046315979581580902400000000
38! = 523022617466601111760007224100074291200000000
39! = 20397882081197443358640281739902897356800000000
40! = 815915283247897734345611269596115894272000000000
41! = 33452526613163807108170062053440751665152000000000
42! = 1405006117752879898543142606244511569936384000000000
43! = 60415263063373835637355132068513997507264512000000000
44! = 2658271574788448768043625811014615890319638528000000000
45! = 119622220865480194561963161495657715064383733760000000000
46! = 5502622159812088949850305428800254892961651752960000000000
47! = 258623241511168180642964355153611979969197632389120000000000
48! = 12413915592536072670862289047373375038521486354677760000000000
49! = 608281864034267560872252163321295376887552831379210240000000000
50! = 30414093201713378043612608166064768844377641568960512000000000000
51! = 1551118753287382280224243016469303211063259720016986112000000000000
52! = 80658175170943878571660636856403766975289505440883277824000000000000
53! = 4274883284060025564298013753389399649690343788366813724672000000000000
54! = 230843697339241380472092742683027581083278564571807941132288000000000000
55! = 12696403353658275925965100847566516959580321051449436762275840000000000000
56! = 710998587804863451854045647463724949736497978881168458687447040000000000000
57! = 40526919504877216755680601905432322134980384796226602145184481280000000000000
58! = 2350561331282878571829474910515074683828862318181142924420699914240000000000000
59! = 138683118545689835737939019720389406345902876772687432540821294940160000000000000
60! = 8320987112741390144276341183223364380754172606361245952449277696409600000000000000
61! = 507580213877224798800856812176625227226004528988036003099405939480985600000000000000
62! = 31469973260387937525653122354950764088012280797258232192163168247821107200000000000000
63! = 1982608315404440064116146708361898137544773690227268628106279599612729753600000000000000
64! = 126886932185884164103433389335161480802865516174545192198801894375214704230400000000000000
65! = 8247650592082470666723170306785496252186258551345437492922123134388955774976000000000000000
66! = 544344939077443064003729240247842752644293064388798874532860126869671081148416000000000000000
67! = 36471110918188685288249859096605464427167635314049524593701628500267962436943872000000000000000
68! = 2480035542436830599600990418569171581047399201355367672371710738018221445712183296000000000000000
69! = 171122452428141311372468338881272839092270544893520369393648040923257279754140647424000000000000000
70! = 11978571669969891796072783721689098736458938142546425857555362864628009582789845319680000000000000000
71! = 850478588567862317521167644239926010288584608120796235886430763388588680378079017697280000000000000000
72! = 61234458376886086861524070385274672740778091784697328983823014963978384987221689274204160000000000000000
73! = 4470115461512684340891257138125051110076800700282905015819080092370422104067183317016903680000000000000000
74! = 330788544151938641225953028221253782145683251820934971170611926835411235700971565459250872320000000000000000
75! = 24809140811395398091946477116594033660926243886570122837795894512655842677572867409443815424000000000000000000
76! = 1885494701666050254987932260861146558230394535379329335672487982961844043495537923117729972224000000000000000000
77! = 145183092028285869634070784086308284983740379224208358846781574688061991349156420080065207861248000000000000000000
78! = 11324281178206297831457521158732046228731749579488251990048962825668835325234200766245086213177344000000000000000000
79! = 894618213078297528685144171539831652069808216779571907213868063227837990693501860533361810841010176000000000000000000
80! = 71569457046263802294811533723186532165584657342365752577109445058227039255480148842668944867280814080000000000000000000
81! = 5797126020747367985879734231578109105412357244731625958745865049716390179693892056256184534249745940480000000000000000000
82! = 475364333701284174842138206989404946643813294067993328617160934076743994734899148613007131808479167119360000000000000000000
83! = 39455239697206586511897471180120610571436503407643446275224357528369751562996629334879591940103770870906880000000000000000000
84! = 3314240134565353266999387579130131288000666286242049487118846032383059131291716864129885722968716753156177920000000000000000000
85! = 281710411438055027694947944226061159480056634330574206405101912752560026159795933451040286452340924018275123200000000000000000000
86! = 24227095383672732381765523203441259715284870552429381750838764496720162249742450276789464634901319465571660595200000000000000000000
87! = 2107757298379527717213600518699389595229783738061356212322972511214654115727593174080683423236414793504734471782400000000000000000000
88! = 185482642257398439114796845645546284380220968949399346684421580986889562184028199319100141244804501828416633516851200000000000000000000
89! = 16507955160908461081216919262453619309839666236496541854913520707833171034378509739399912570787600662729080382999756800000000000000000000
90! = 1485715964481761497309522733620825737885569961284688766942216863704985393094065876545992131370884059645617234469978112000000000000000000000
91! = 135200152767840296255166568759495142147586866476906677791741734597153670771559994765685283954750449427751168336768008192000000000000000000000
92! = 12438414054641307255475324325873553077577991715875414356840239582938137710983519518443046123837041347353107486982656753664000000000000000000000
93! = 1156772507081641574759205162306240436214753229576413535186142281213246807121467315215203289516844845303838996289387078090752000000000000000000000
94! = 108736615665674308027365285256786601004186803580182872307497374434045199869417927630229109214583415458560865651202385340530688000000000000000000000
95! = 10329978488239059262599702099394727095397746340117372869212250571234293987594703124871765375385424468563282236864226607350415360000000000000000000000
96! = 991677934870949689209571401541893801158183648651267795444376054838492222809091499987689476037000748982075094738965754305639874560000000000000000000000
97! = 96192759682482119853328425949563698712343813919172976158104477319333745612481875498805879175589072651261284189679678167647067832320000000000000000000000
98! = 9426890448883247745626185743057242473809693764078951663494238777294707070023223798882976159207729119823605850588608460429412647567360000000000000000000000
99! = 933262154439441526816992388562667004907159682643816214685929638952175999932299156089414639761565182862536979208272237582511852109168640000000000000000000000
100! = 93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000
101! = 9425947759838359420851623124482936749562312794702543768327889353416977599316221476503087861591808346911623490003549599583369706302603264000000000000000000000000
102! = 961446671503512660926865558697259548455355905059659464369444714048531715130254590603314961882364451384985595980362059157503710042865532928000000000000000000000000
103! = 99029007164861804075467152545817733490901658221144924830052805546998766658416222832141441073883538492653516385977292093222882134415149891584000000000000000000000000
104! = 10299016745145627623848583864765044283053772454999072182325491776887871732475287174542709871683888003235965704141638377695179741979175588724736000000000000000000000000
105! = 1081396758240290900504101305800329649720646107774902579144176636573226531909905153326984536526808240339776398934872029657993872907813436816097280000000000000000000000000
106! = 114628056373470835453434738414834942870388487424139673389282723476762012382449946252660360871841673476016298287096435143747350528228224302506311680000000000000000000000000
107! = 12265202031961379393517517010387338887131568154382945052653251412013535324922144249034658613287059061933743916719318560380966506520420000368175349760000000000000000000000000
108! = 1324641819451828974499891837121832599810209360673358065686551152497461815091591578895743130235002378688844343005686404521144382704205360039762937774080000000000000000000000000
109! = 144385958320249358220488210246279753379312820313396029159834075622223337844983482099636001195615259277084033387619818092804737714758384244334160217374720000000000000000000000000
110! = 15882455415227429404253703127090772871724410234473563207581748318444567162948183030959960131517678520479243672638179990208521148623422266876757623911219200000000000000000000000000
111! = 1762952551090244663872161047107075788761409536026565516041574063347346955087248316436555574598462315773196047662837978913145847497199871623320096254145331200000000000000000000000000
112! = 197450685722107402353682037275992488341277868034975337796656295094902858969771811440894224355027779366597957338237853638272334919686385621811850780464277094400000000000000000000000000
113! = 22311927486598136465966070212187151182564399087952213171022161345724023063584214692821047352118139068425569179220877461124773845924561575264739138192463311667200000000000000000000000000
114! = 2543559733472187557120132004189335234812341496026552301496526393412538629248600474981599398141467853800514886431180030568224218435400019580180261753940817530060800000000000000000000000000
115! = 292509369349301569068815180481773552003419272043053514672100535242441942363589054622883930786268803187059211939585703515345785120071002251720730101703194015956992000000000000000000000000000
116! = 33931086844518982011982560935885732032396635556994207701963662088123265314176330336254535971207181169698868584991941607780111073928236261199604691797570505851011072000000000000000000000000000
117! = 3969937160808720895401959629498630647790406360168322301129748464310422041758630649341780708631240196854767624444057168110272995649603642560353748940315749184568295424000000000000000000000000000
118! = 468452584975429065657431236280838416439267950499862031533310318788629800927518416622330123618486343228862579684398745837012213486653229822121742374957258403779058860032000000000000000000000000000
119! = 55745857612076058813234317117419771556272886109483581752463927935846946310374691578057284710599874844234646982443450754604453404911734348832487342619913750049708004343808000000000000000000000000000
120! = 6689502913449127057588118054090372586752746333138029810295671352301633557244962989366874165271984981308157637893214090552534408589408121859898481114389650005964960521256960000000000000000000000000000
121! = 809429852527344373968162284544935082997082306309701607045776233628497660426640521713391773997910182738287074185078904956856663439318382745047716214841147650721760223072092160000000000000000000000000000
122! = 98750442008336013624115798714482080125644041369783596059584700502676714572050143649033796427745042294071023050579626404736512939596842694895821378210620013388054747214795243520000000000000000000000000000
123! = 12146304367025329675766243241881295855454217088483382315328918161829235892362167668831156960612640202170735835221294047782591091570411651472186029519906261646730733907419814952960000000000000000000000000000
124! = 1506141741511140879795014161993280686076322918971939407100785852066825250652908790935063463115967385069171243567440461925041295354731044782551067660468376444194611004520057054167040000000000000000000000000000
125! = 188267717688892609974376770249160085759540364871492425887598231508353156331613598866882932889495923133646405445930057740630161919341380597818883457558547055524326375565007131770880000000000000000000000000000000
126! = 23721732428800468856771473051394170805702085973808045661837377170052497697783313457227249544076486314839447086187187275319400401837013955325179315652376928996065123321190898603130880000000000000000000000000000000
127! = 3012660018457659544809977077527059692324164918673621799053346900596667207618480809067860692097713761984609779945772783965563851033300772326297773087851869982500270661791244122597621760000000000000000000000000000000
128! = 385620482362580421735677065923463640617493109590223590278828403276373402575165543560686168588507361534030051833058916347592172932262498857766114955245039357760034644709279247692495585280000000000000000000000000000000
129! = 49745042224772874403902341504126809639656611137138843145968864022652168932196355119328515747917449637889876686464600208839390308261862352651828829226610077151044469167497022952331930501120000000000000000000000000000000
130! = 6466855489220473672507304395536485253155359447828049608975952322944781961185526165512707047229268452925683969240398027149120740074042105844737747799459310029635780991774612983803150965145600000000000000000000000000000000
131! = 847158069087882051098456875815279568163352087665474498775849754305766436915303927682164623187034167333264599970492141556534816949699515865660644961729169613882287309922474300878212776434073600000000000000000000000000000000
132! = 111824865119600430744996307607616902997562475571842633838412167568361169672820118454045730260688510087990927196104962685462595837360336094267205134948250389032461924909766607715924086489297715200000000000000000000000000000000
133! = 14872707060906857289084508911813048098675809251055070300508818286592035566485075754388082124671571841702793317081960037166525246368924700537538282948117301741317436012998958826217903503076596121600000000000000000000000000000000
134! = 1992942746161518876737324194182948445222558439641379420268181650403332765909000151088003004705990626788174304488982644980314383013435909872030129915047718433336536425741860482713199069412263880294400000000000000000000000000000000
135! = 269047270731805048359538766214698040105045389351586221736204522804449923397715020396880405635308734616403531106012657072342441706813847832724067538531441988500432417475151165166281874370655623839744000000000000000000000000000000000
136! = 36590428819525486576897272205198933454286172951815726156123815101405189582089242773975735166401987907830880230417721361838572072126683305250473185240276110436058808776620558462614334914409164842205184000000000000000000000000000000000
137! = 5012888748274991661034926292112253883237205694398754483388962668892510972746226260034675717797072343372830591567227826571884373881355612819314826377917827129740056802397016509378163883274055583382110208000000000000000000000000000000000
138! = 691778647261948849222819828311491035886734385827028118707676848307166514238979223884785249055995983385450621636277440066920043595627074569065446040152660143904127838730788278294186615891819670506731208704000000000000000000000000000000000
139! = 96157231969410890041971956135297253988256079629956908500367081914696145479218112119985149618783441690577636407442564169301886059792163365100096999581219760002673769583579570682891939608962934200435638009856000000000000000000000000000000000
140! = 13462012475717524605876073858941615558355851148193967190051391468057460367090535696797920946629681836680869097041958983702264048370902871114013579941370766400374327741701139895604871545254810788060989321379840000000000000000000000000000000000
141! = 1898143759076170969428526414110767793728175011895349373797246196996101911759765533248506853474785138972002542682916216702019230820297304827075914771733278062452780211579860725280286887880928321116599494314557440000000000000000000000000000000000
142! = 269536413788816277658850750803729026709400851689139611079208959973446471469886705721287973193419489734024361060974102771686730776482217285444779897586125484868294790044340222989800738079091821598557128192667156480000000000000000000000000000000000
143! = 38543707171800727705215657364933250819444321791546964384326881276202845420193798918144180166658987031965483631719296696351202501036957071818603525354815944336166154976340651887541505545310130488593669331551403376640000000000000000000000000000000000
144! = 5550293832739304789551054660550388117999982337982762871343070903773209740507907044212761943998894132603029642967578724274573160149321818341878907651093495984407926316593053871805976798524658790357488383743402086236160000000000000000000000000000000000
145! = 804792605747199194484902925779806277109997439007500616344745281047115412373646521410850481879839649227439298230298915019813108221651663659572441609408556917739149315905992811411866635786075524601835815642793302504243200000000000000000000000000000000000
146! = 117499720439091082394795827163851716458059626095095089986332811032878850206552392125984170354456588787206137541623641592892713800361142894297576474973649309989915800122274950466132528824767026591868029083847822165619507200000000000000000000000000000000000
147! = 17272458904546389112034986593086202319334765035978978227990923221833190980363201642519673042105118551719302218618675314155228928653088005461743741821126448568517622617974417718521481737240752909004600275325629858346067558400000000000000000000000000000000000
148! = 2556323917872865588581178015776757943261545225324888777742656636831312265093753843092911610231557545654456728355563946494973881440657024808338073789526714388140608147460213822341179297111631430532680840748193219035217998643200000000000000000000000000000000000
149! = 380892263763056972698595524350736933545970238573408427883655838887865527498969322620843829924502074302514052524979028027751108334657896696442372994639480443832950613971571859528835715269633083149369445271480789636247481797836800000000000000000000000000000000000
150! = 57133839564458545904789328652610540031895535786011264182548375833179829124845398393126574488675311145377107878746854204162666250198684504466355949195922066574942592095735778929325357290444962472405416790722118445437122269675520000000000000000000000000000000000000
151! = 8627209774233240431623188626544191544816225903687700891564804750810154197851655157362112747789971982951943289690774984828562603780001360174419748328584232052816331406456102618328128950857189333333217935399039885261005462721003520000000000000000000000000000000000000
152! = 1311335885683452545606724671234717114812066337360530535517850322123143438073451583919041137664075741408695380032997797693941515774560206746511801745944803272028082373781327597985875600530292778666649126180654062559672830333592535040000000000000000000000000000000000000
153! = 200634390509568239477828874698911718566246149616161171934231099284840946025238092339613294062603588435530393145048663047173051913507711632216305667129554900620296603188543122491838966881134795135997316305640071571629943041039657861120000000000000000000000000000000000000
154! = 30897696138473508879585646703632404659201907040888820477871589289865505687886666220300447285640952619071680544337494109264649994680187591361311072737951454695525676891035640863743200899694758450943586711068571022031011228320107310612480000000000000000000000000000000000000
155! = 4789142901463393876335775239063022722176295591337767174070096339929153381622433264146569329274347655956110484372311586936020749175429076661003216274382475477806479918110524333880196139452687559896255940215628508414806740389616633144934400000000000000000000000000000000000000
156! = 747106292628289444708380937293831544659502112248691679154935029028947927533099589206864815366798234329153235562080607562019236871366935959116501738803666174537810867225241796085310597754619259343815926673638047312709851500780194770609766400000000000000000000000000000000000000
157! = 117295687942641442819215807155131552511541831623044593627324799557544824622696635505477776012587322789677057983246655387237020188804608945581290772992175589402436306154362961985393763847475223716979100487761173428095446685622490578985733324800000000000000000000000000000000000000
158! = 18532718694937347965436097530510785296823609396441045793117318330092082290386068409865488609988797000768975161352971551183449189831128213401843942132763743125584936372389347993692214687901085347282697877066265401639080576328353511479745865318400000000000000000000000000000000000000
159! = 2946702272495038326504339507351214862194953894034126281105653614484641084171384877168612688988218723122267050655122476638168421183149385930893186799109435156968004883209906330997062135376272570217948962453536198860613811636208208325279592585625600000000000000000000000000000000000000
160! = 471472363599206132240694321176194377951192623045460204976904578317542573467421580346978030238114995699562728104819596262106947389303901748942909887857509625114880781313585012959529941660203611234871833992565791817698209861793313332044734813700096000000000000000000000000000000000000000
161! = 75907050539472187290751785709367294850142012310319093001281637109124354328254874435863462868336514307629599224875954998199218529677928181579808491945059049643495805791487187086484320607292781408814365272803092482649411787748723446459202305005715456000000000000000000000000000000000000000
162! = 12296942187394494341101789284917501765723005994271693066207625211678145401177289658609880984670515317835995074429904709708273401807824365415928975695099566042246320538220924308010459938381430588227927174194100982189204709615293198326390773410925903872000000000000000000000000000000000000000
163! = 2004401576545302577599591653441552787812849977066285969791842909503537700391898214353410600501293996807267197132074467682448564494675371562796423038301229264886150247730010662205704969956173185881152129393638460096840367667292791327201696065980922331136000000000000000000000000000000000000000
164! = 328721858553429622726333031164414657201307396238870899045862237158580182864271307153959338482212215476391820329660212699921564577126760936298613378281401599441328640627721748601735615072812402484508949220556707455881820297436017777661078154820871262306304000000000000000000000000000000000000000
165! = 54239106661315887749844950142128418438215720379413698342567269131165730172604765680403290849565015553604650354393935095487058155225915554489271207416431263907819225703574088519286376487014046409943976621391856730220500349076942933314077895545443758280540160000000000000000000000000000000000000000
166! = 9003691705778437366474261723593317460743809582982673924866166675773511208652391102946946281027792581898371958829393225850851653767501982045219020431127589808697991466793298694201538496844331704050700119151048217216603057946772526930136930660543663874569666560000000000000000000000000000000000000000
167! = 1503616514864999040201201707840084015944216200358106545452649834854176371844949314192140028931641361177028117124508668717092226179172831001551576411998307498052564574954480881931656928973003394576466919898225052275172710677111011997332867420310791867053134315520000000000000000000000000000000000000000
168! = 252607574497319838753801886917134114678628321660161899636045172255501630469951484784279524860515748677740723676917456344471493998101035608260664837215715659672830848592352788164518364067464570288846442542901808782229015393754650015551921726612213033664926565007360000000000000000000000000000000000000000
169! = 42690680090047052749392518888995665380688186360567361038491634111179775549421800928543239701427161526538182301399050122215682485679075017796052357489455946484708413412107621199803603527401512378815048789750405684196703601544535852628274771797464002689372589486243840000000000000000000000000000000000000000
170! = 7257415615307998967396728211129263114716991681296451376543577798900561843401706157852350749242617459511490991237838520776666022565442753025328900773207510902400430280058295603966612599658257104398558294257568966313439612262571094946806711205568880457193340212661452800000000000000000000000000000000000000000
171! = 1241018070217667823424840524103103992616605577501693185388951803611996075221691752992751978120487585576464959501670387052809889858690710767331242032218484364310473577889968548278290754541561964852153468318044293239598173696899657235903947616152278558180061176365108428800000000000000000000000000000000000000000
172! = 213455108077438865629072570145733886730056159330291227886899710221263324938130981514753340236723864719151973034287306573083301055694802251980973629541579310661401455397074590303866009781148657954570396550703618437210885875866741044575478989978191912006970522334798649753600000000000000000000000000000000000000000
173! = 36927733697396923753829554635211962404299715564140382424433649868278555214296659802052327860953228596413291334931704037143411082635200789592708437910693220744422451783693904122568819692138717826140678603271725989637483256524946200711557865266227200777205900363920166407372800000000000000000000000000000000000000000
174! = 6425425663347064733166342506526881458348150508160426541851455077080468607287618805557105047805861775775912692278116502462953528378524937389131268196460620409529506610362739317326974626432136901748478076969280322196922086635340638923811068556323532935233826663322108954882867200000000000000000000000000000000000000000
175! = 1124449491085736328304109938642204255210926338928074644824004638489082006275333290972493383366025810760784721148670387931016867466241864043097971934380608571667663656813479380532220559625623957805983663469624056384461365161184611811666936997356618263665919666081369067104501760000000000000000000000000000000000000000000
176! = 197903110431089593781523349201027948917123035651341137489024816374078433104458659211158835472420542693898110922165988275858968674058568071585243060450987108613508803599172370973670818494109816573853124770653833923665200268368491678853380911534764814405201861230320955810392309760000000000000000000000000000000000000000000
177! = 35028850546302858099329632808581946958330777310287381335557392498211882659489182680375113878618436056819965633223379924827037455308366548670588021699824718224591058237053509662339734873457437533572003084405728604488740447501223027157048421341653372149720729437766809178439438827520000000000000000000000000000000000000000000
178! = 6235135397241908741680674639927586558582878361231153877729215864681715113389074517106770270394081618113953882713761626619212667044889245663364667862568799843977208366195524719896472807475423880975816549024219691598995799655217698833954618998814300242650289839922492033762220111298560000000000000000000000000000000000000000000
179! = 1116089236106301664760840760547037993986335226660376544113529639778027005296644338562111878400540609642397745005763331164839067401035174973742275547399815172071920297548998924861468632538100874694671162275335324796220248138283968091277876800787759743434401881346126074043437399922442240000000000000000000000000000000000000000000
180! = 200896062499134299656951336898466838917540340798867777940435335160044860953395980941180138112097309735631594101037399609671032132186331495273609598531966730972945653558819806475064353856858157445040809209560358463319644664891114256430017824141796753818192338642302693327818731986039603200000000000000000000000000000000000000000000
181! = 36362187312343308237908191978622497844074801684595067807218795663968119832564672550353604998289613062149318532287769329350456815925726000644523337334285978306103163294146384971986648048091326497552386466930424881860855684345291680413833226169665212441092813294256787492335190489473168179200000000000000000000000000000000000000000000
182! = 6617918090846482099299290940109294607621613906596302340913820810842197809526770404164356109688709577311175972876374017941783140498482132117303247394840048051710775719534642064901569944752621422554534336981337328498675734550843085835317647162879068664278892019554735323605004669084116608614400000000000000000000000000000000000000000000
183! = 1211079010624906224171770242040000913194755344907123328387229208384122199143398983962077168073033852647945203036376445283346314711222230177466494273255728793463071956674839497876987299889729720327479783667584731115257659422804284707863129430806869565563037239578516564219715854442393339376435200000000000000000000000000000000000000000000
184! = 222838537954982745247605724535360168027834983462910692423250174342678484642385413049022198925438228887221917358693265932135721906864890352653834946279054097997205240028170467609365663179710268540256280194835590525207409333795988386246815815268464000063598852082447047816427717217400374445264076800000000000000000000000000000000000000000000
185! = 41225129521671807870807059039041631085149471940638478098301282253395519658841301414069106801206072344136054711358254197445108552770004715240959465061625008129482969405211536507732647688246399679947411836044584247163370726752257851455660925824665840011765787635252703846039127685219069272373854208000000000000000000000000000000000000000000000
186! = 7667874091030956263970112981261743381837801780958756926284038499131566656544482063016853865024329456009306176312635280724790190815220877034818460501462251512083832309369345790438272470013830340470218601504292669972386955175919960370752932203387846242188436500157002915363277749450746884661536882688000000000000000000000000000000000000000000000
187! = 1433892455022788821362411127495946012403668933039287545215115199337602964773818145784151672759549608273740254970462797495535765682446304005511052113773441032759676641852067662811956951892586273667930878481302729284836360617897032589330798322033527247289237625529359545172932939147289667431707397062656000000000000000000000000000000000000000000000
188! = 269571781544284298416133291969237850331889759411386058500441657475469357377477811407420514478795326355463167934447005929160723948299905153036077797389406914158819208668188720608647906955806219449571005154484913105549235796164642126794190084542303122490376673599519594492511392559690457477160990647779328000000000000000000000000000000000000000000000
189! = 50949066711869732400649192182185953712727164528751965056583473262863708544343306356002477236492316681182538739610484120611376826228682073923818703706597906776016830438287668195034454414647375475968919974197648576948805565475117361964101925978495290150681191310309203359084653193781496463183427232430292992000000000000000000000000000000000000000000000
190! = 9680322675255249156123346514615331205418161260462873360750859919944104623425228207640470674933540169424682360525991982916161596983449594045525553704253602287443197783274656957056546338783001340434094795097553229620273057440272298773179365935914105128629426348958748638226084106818484328004851174161755668480000000000000000000000000000000000000000000000
191! = 1848941630973752588819559184291528260234868800748408811903414244709323983074218587659329898912306172360114330860464468736986865023838872462695380757512438036901650776605459478797800350707553256022912105863632666857472153971092009065677258893759594079568220432651120989901182064402330506648926574264895332679680000000000000000000000000000000000000000000000
192! = 354996793146960497053355363383973425965094809743694491885455534984190204750249968830591340591162785093141951525209177997501478084577063512837513105442388103085116949108248219929177667335850225156399124325817472036634653562449665740610033707601842063277098323069015230061026956365247457276593902258859903874498560000000000000000000000000000000000000000000000
193! = 68514381077363375931297585133106871211263298280533036933892918251948709516798243984304128734094417522976396644365371353517785270323373257977640029350380903895427571177891906446331289795819093455185030994882772103070488137552785487937736505567155518212479976352319939401778202578492759254382623135959961447778222080000000000000000000000000000000000000000000000
194! = 13291789929008494930671731515822733014985079866423409165175226140878049646258859332955000974414316999457420949006882042582450342442734412047662165693973895355712948808511029850588270220388904130305896013007257787995674698685240384659920882080028170533221115412350068243944971300227595295350228888376232520868975083520000000000000000000000000000000000000000000000
195! = 2591899036156656511480987645585432937922090573952564787209169097471219681020477569926225190010791814894197085056341998303577816776333210349294122310324909594364025017659650820864712692975836305409649722536415268659156566243621875008684572005605493253978117505408263307569269403544381082593294633233365341569450141286400000000000000000000000000000000000000000000000
196! = 508012211086704676250273578534744855832729752494702698292997143104359057480013603705540137242115195719262628671043031667501252088161309228461647972823682280495348903461291560889483687823263915860291345617137392657194686983749887501702176113098676677779711031060019608283576803094698692188285748113739606947612227692134400000000000000000000000000000000000000000000000
197! = 100078405584080821221303894971344736599047761241456431563720437191558734323562679929991407036696693556694737848195477238497746661367777918006944650646265409257583733981874437495228286501182991424477395086576066353467353335798727837835328694280439305522603073118823862831864630209655642361092292378406702568679608855350476800000000000000000000000000000000000000000000000
198! = 19815524305648002601818171204326257846611456725808373449616646563928629396065410626138298593265945324225558093942704493222553838950820027765375040827960551033001579328411138624055200727234232302046524227142061137986535960488148111891395081467526982493475408477527124840709196781511817187496273890924527108598562553359394406400000000000000000000000000000000000000000000000
199! = 3943289336823952517761816069660925311475679888435866316473712666221797249817016714601521420059923119520886060694598194151288213951213185525309633124764149655567314286353816586186984944719612228107258321201270166459320656137141474266387621212037869516201606287027897843301130159520851620311758504293980894611113948118519486873600000000000000000000000000000000000000000000000
200! = 788657867364790503552363213932185062295135977687173263294742533244359449963403342920304284011984623904177212138919638830257642790242637105061926624952829931113462857270763317237396988943922445621451664240254033291864131227428294853277524242407573903240321257405579568660226031904170324062351700858796178922222789623703897374720000000000000000000000000000000000000000000000000

``````

Multipled 函數跑遞迴處理，由右至左逐位乘上去

``````using System;

namespace MathGame
{
class Program
{
static void Main(string[] args)
{
int maxDecCnt = 1000; // 最大位數...1000個0 (大概到300!就OVER了)
byte[] res = new byte[maxDecCnt];
for (int i = 0; i < res.Length; i++) res[i] = 0xFF;
res[res.Length - 1] = 1;
int actlevel = 200;  //  階乘基底

for (int x = 1; x <= actlevel; x++)
{
res = Multipled(res, x, 1);
Console.WriteLine(\$"{x}! = {getString(res)} ");
}
}

/// <summary>
/// 遞迴作法
/// </summary>
/// <param name="inbytes">乘數</param>
/// <param name="M">被乘數</param>
/// <param name="qp">位數</param>
/// <param name="n">進位</param>
/// <returns></returns>
private static byte[] Multipled(byte[] inbytes, int M, int qp, int n = 0)
{
int ndigits = (int)Math.Log10(M); //
byte[] rsum = reset(inbytes);
byte[] c = new byte[inbytes.Length];
for (int degree = 0; degree <= ndigits; degree++)
{
inbytes.CopyTo(c, 0);
int tx = (int)(M % Math.Pow(10, degree + 1) / Math.Pow(10, degree));
int vn = inbytes[inbytes.Length - qp];
int next = vn * tx + n;
int o = (byte)(next / 10); // 十位數進位
c[c.Length - qp] = (byte)((next) % 10); // 取個位數
if ((qp + 1) < c.Length && c[c.Length - (qp + 1)] == 0xFF)
{
if (o > 0)
{
c[c.Length - (qp + 1)] = (byte)(next / 10);
}
}
else if ((qp + 1) < c.Length && c[c.Length - (qp + 1)] != 0xFF)
{
c = Multipled(c, tx, qp + 1, o);  // 下一位有數字
}
var xc = ShiftLeft(c, degree);
rsum = add(rsum, xc);
}
return rsum;
}

private static byte[] add(byte[] rs, byte[] vs)
{
int maxL = rs.Length > vs.Length ? rs.Length : vs.Length;
byte[] ret = reset(new byte[maxL]);
int pint = 0;
for (int i = 1; i <= maxL; i++)
{
var ps = (rs.Length - i >= 0 && rs[rs.Length - i] != 0xFF ? rs[rs.Length - i] : 0) +
(vs.Length - i >= 0 && vs[vs.Length - i] != 0xFF ? vs[vs.Length - i] : 0) + pint;
if (ps > 0)
{
ret[maxL - i] = (byte)(ps % 10);
pint = ps >= 10 ? 1 : 0;
}
else
{
if(rs[rs.Length - i] != 0xFF || vs[vs.Length - i] != 0xFF)
ret[maxL - i] = 0;
pint = 0;
}
}
return ret;
}

private static byte[] ShiftLeft(byte[] inbytes, int offset)
{
byte[] ret = reset(inbytes);
if (offset > 0)
{
for (int x = offset; x < ret.Length; x++)
ret[x - offset] = inbytes[x];
for (int y = ret.Length - offset; y < ret.Length; y++)
ret[y] = 0;
}
else
{
ret = inbytes;
}
return ret;
}

private static byte[] reset(byte[] res, byte withByte = 0xFF)
{
byte[] ret = new byte[res.Length];
for (int x = 0; x < ret.Length; x++) ret[x] = withByte;
return ret;
}

private static string getString(byte[] res)
{
string R = "";
bool numbegin = false;
foreach (byte b in res)
{
R = R + (b != 0xFF ? b.ToString() : numbegin ? "0": "");
if(b!=0xFF) numbegin=true;
}
return R;
}
}
}

``````

1
richardsuma
iT邦大師 1 級 ‧ 2020-09-04 23:57:09
1

iT邦大神 1 級 ‧ 2020-09-06 11:10:09
``````#include <stdio.h>

int fun(int);

int main() {
printf("%d\n", fun(10));
}

int fun(int x) {
if (x==1) {
printf("%d = ", x);
return 1;
} else {
printf("%d * ", x);
return x * fun(x - 1);
}
}
``````