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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <windows.h>
  4. #include <math.h>
  5. #define num 20
  6. #define cyc 1000000000ul 
  7. using namespace std;
  8. int main(){
  9.     LARGE_INTEGER startTime, endTime, fre;
  10.     double times[num], timeAvg, timeSd;
  11.     unsigned int i;
  12.     int n;
  13.     int p=1234;
  14.     int q;
  15.     QueryPerformanceFrequency(&fre); //取得CPU頻率
  16.     printf("執行%3d輪，每輪執行 %d次\n\n", num, cyc);
  17.     for (n = 0; n < num; n++){
  18.         QueryPerformanceCounter(&startTime); //取得開機到現在經過幾個CPU Cycle
  19.         for(i = 0; i < cyc; i++){
  20.             //↓輸入測試程式↓ 
  21.             q = p*2;
  22.             //↑輸入測試程式↑ 
  23.         }
  24.         QueryPerformanceCounter(&endTime); //取得開機到程式執行完成經過幾個CPU Cycle
  25.         times[n] = ((double)endTime.QuadPart - (double)startTime.QuadPart)/fre.QuadPart;
  26.     }
  27.     timeAvg = 0;
  28.     timeSd = 0;
  29.     for (n = 0; n < num; n++){
  30.         timeAvg += times[n];
  31.         printf("第%3d輪所需時間%15.10f秒\n", n + 1, times[n]);
  32.     }
  33.     timeAvg /= num;
  34.     for (n = 0; n < num; n++){
  35.         timeSd += (times[n] - timeAvg)*(times[n] - timeAvg);
  36.     }
  37.     timeSd = sqrt(timeSd / num);
  38.     printf("\n執行完畢，\n平均執行時間%15.10f秒，\n標準差%15.10f秒\n", timeAvg, timeSd);
  39.     system("pause");
  40.     return 0;
  41. }
  42.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp:3:21: fatal error: windows.h: No such file or directory
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/Y63MJt
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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