c++ - 如何计算我的程序运行需要多少毫秒？

Question

这将显示多少秒:

#include <iostream>
#include <time.h>
using namespace std;
int main(void)
{
    int times,timed;

    times=time(NULL);
    //CODE HERE

    timed=time(NULL);
    times=timed-times;
    cout << "time from start to end" << times;
}

这将显示多少个刻度:

#include <iostream>
#include <time.h>
using namespace std;
int main(void)
{
    int times,timed;

    times=clock();
    //CODE HERE

    timed=clock();
    times=timed-times;
    cout << "ticks from start to end" << times;
}

我如何获得毫秒数？

Answer 1

请参阅 Stack Overflow 上的问题“Convert Difference between 2 times into Milliseconds”。

或者使用这个:

static double diffclock(clock_t clock1,clock_t clock2)
{
    double diffticks=clock1-clock2;
    double diffms=(diffticks)/(CLOCKS_PER_SEC/1000);
    return diffms;
}