各位好，最近開始學習C# 目前學到陣列
有一個作業想了好幾天想不太出來..
想請問各位大神能不能提點一下 感恩
這個作業是要寫 用Array.sort來測試 分別跑1000/2000/4000/8000 筆資料 所需要的時間(ms)
目前困難點是，不知道怎樣分開紀錄時間...
第一次發文如有冒犯請見諒XD
目前寫到這裡
執行後是這樣
謝謝各位!
已邀請的邦友 {{ invite_list.length }}/5
您好!
我使用您建議的方式 產生一些錯誤 再麻煩您給我指教謝謝!
//Array.Sort 排序後
s.Reset();
s.Start();
for (int i = 0; i < A.Length - 1; i++)
{
/*Console.WriteLine("A[{0}]={1,4}", i, A[i]);*/
}
s.Stop();
float t1k, t2k, t4k, t8k;
switch (test)
{
case 1000:
t1k= 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
case 2000:
t2k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
case 4000:
t4k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
case 8000:
t8k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
}
test = test * 2;
} while (test < 8001);
Console.WriteLine(" Size\t Array.Sort ");
/*Console.WriteLine("{0} ticks", s.ElapsedTicks);*/
/*Console.WriteLine(Stopwatch.Frequency);*/
Console.Write(" 1000\t {0} \n 2000\t {1}\n 4000\t {2}\n 8000\t {3}", t1k, t2k, t4k, t8k);
什麼錯誤？可否說明一下？
s.Reset();
s.Start();
for (int i = 0; i < A.Length - 1; i++)
{
/*Console.WriteLine("A[{0}]={1,4}", i, A[i]);*/
}
s.Stop();
你要算的時間
是這個什麼事都沒做的迴圈嗎？
抱歉!
我覺得自己表達的方式可能不太好
要輸出結果的時候 它顯示錯誤 t1k, t2k, t4k, t8k不存在目前內容中
Stopwatch s = new Stopwatch();
//Array.Sort 排序前
int test = 10;
do
{
int[] A = new int[test];
for (int i = 0; i <= test - 1; i++)
{
A[i] = i;
}
Random rng = new Random();
for (int i = 0; i < A.Length - 1; i++)
{
int j = rng.Next(A.Length);
int tmp = A[i];
A[i] = A[j];
A[j] = tmp;
}
for (int i = 0; i < A.Length; i++)
{
Console.WriteLine("A[{0}]={1,4}", i, A[i]);
}
Array.Sort(A);
//Array.Sort 排序後
s.Reset();
s.Start();
for (int i = 0; i < A.Length; i++)
{
Console.WriteLine("A[{0}]={1,4}", i, A[i]);
}
s.Stop();
float t1k, t2k, t4k, t8k;
switch (test)
{
case 1000:
t1k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
case 2000:
t2k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
case 4000:
t4k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
case 8000:
t8k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
}
test = test * 2;
} while (test < 8001);
Console.WriteLine(" Size\t Array.Sort ");
Console.WriteLine("{0} ticks", s.ElapsedTicks);
Console.WriteLine(Stopwatch.Frequency);
Console.Write(" 1000\t {0} \n 2000\t {1}\n 4000\t {2}\n 8000\t {3}", t1k, t2k, t4k, t8k);
謝謝!
把float t1k, t2k, t4k, t8k;
搬到int test = 1000;的下面試看看
還是沒辦法 我再研究看看怎樣改
我是指「接在 int test=1000;的下一列」，如下：
using System.IO;
using System.Diagnostics;
using System;
class Program
{
static void Main()
{
Stopwatch s = new Stopwatch();
//Array.Sort 排序前
int test = 1000;
float t1k=0, t2k=0, t4k=0, t8k=0;
do
{
Console.WriteLine(test);
int[] A = new int[test];
for (int i = 0; i <= test - 1; i++)
{
A[i] = i;
}
// Random rng = new Random();
// for (int i = 0; i < A.Length - 1; i++)
// {
// int j = rng.Next(A.Length);
// int tmp = A[i];
// A[i] = A[j];
// A[j] = tmp;
// }
// for (int i = 0; i < A.Length; i++)
// {
// Console.WriteLine("A[{0}]={1,4}", i, A[i]);
// }
s.Reset();
s.Start();
Array.Sort(A);
s.Stop();
//Array.Sort 排序後
// s.Reset();
// s.Start();
// for (int i = 0; i < A.Length; i++)
// {
// Console.WriteLine("A[{0}]={1,4}", i, A[i]);
// }
// s.Stop();
switch (test)
{
case 1000:
t1k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
case 2000:
t2k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
case 4000:
t4k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
case 8000:
t8k = 1000.0f * s.ElapsedTicks / Stopwatch.Frequency;
break;
}
test = test * 2;
} while (test < 8001);
Console.WriteLine(" Size\t Array.Sort ");
Console.WriteLine("{0} ticks", s.ElapsedTicks);
Console.WriteLine(Stopwatch.Frequency);
Console.Write(" 1000\t {0} \n 2000\t {1}\n 4000\t {2}\n 8000\t {3}", t1k, t2k, t4k, t8k);
}
}
把Array.sort執行前的時間記下
DateTime dtBefore = DateTime.Now;
Array.Sort();
var TotalPeriod = (DateTime.Now - dtBefore).TotalSeconds;
MessageBox.Show($"總共用掉{TotalPeriod}秒");
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