#include <stdio.h>
void update(int *a, int *b) {
// Complete this function
*a = *a + *b ;
*b = *a - *b - *b ;
if( *b < 0) *b = 0 - *b ;
}
int main() {
int a, b;
int *pa = &a, *pb = &b;
scanf("%d %d", &a, &b);
update(pa, pb);
printf("%d\n%d", a, b);
return 0;
}
A pointer in C++ is used to share a memory address among different contexts (primarily functions). They are used whenever a function needs to modify the content of a variable, but it does not have ownership.
In order to access the memory address of a variable, val
, prepend it with &
sign. For example, &val
returns the memory address of val
.
This memory address is assigned to a pointer and can be shared among functions. For example, int *p = &val
assigns the memory address of val
to pointer p
. To access the content of the memory pointed to, prepend the variable name with a *
. For example, *p
will return the value stored in val
and any modification to it will be performed on val
.
void increment(int * v) { (* v)++; }
int main() {
int a;
scanf("%d", &a);
increment(&a);
printf("%d", a);
return 0;
}
Function Description
Complete the update function in the editor below.
update has the following parameters:
● int *a
: an integer
● int *b
: an integer
Returns
●The function is declared with a void return type, so there is no value to return. Modify the values in memory so that a
contains their sum and b
contains their absoluted difference.
● a' = a + b
● b' = |a - b|
Input Format
Input will contain two integers, a
and b
, separated by a newline.
Sample Input4
5
Sample Output9
1
Explanation
● a' = 4 + 5 = 9
● b' = |4 - 5| = 1
我查了一下你標題裡的 HakerRanker, Google 建議改成 HackerRank.
感謝提醒,已修正。