计算程序执行时间c_c++

这里使用的是c++11

#include <chrono>

auto start = std::chrono::steady_clock::now();

// do stuff

auto end = std::chrono::steady_clock::now();

auto diff = end - start;

std::cout << "Program running " << std::chrono::duration <double, std::milli> (diff).count() << "ms" << std::endl;

[1] https://solarianprogrammer.com/2012/10/14/cpp-11-timing-code-performance/
[2] http://www.cplusplus.com/reference/chrono/

#include <time.h>
clock_t starttime = clock();
clock_t endtime = clock();
double duration = (double)(endtime - starttime) * 1000.0 / CLOCKS_PER_SEC;
printf("Time elapsed in ms: %f", duration);
int cnduration = (int)duration;
if (cnduration > 1000 * 60 * 60) // > 1h
{
    printf("%dh", cnduration / 1000 * 60 * 60);
    cnduration = cnduration - (cnduration / (1000 * 60 * 60)) * 1000 * 60 * 60;
}
if (cnduration > 1000 * 60) // > 1min
{
    printf("%dmin", cnduration / 1000 * 60);
    cnduration = cnduration - (cnduration / (1000 * 60)) * 1000 * 60;
}
if (cnduration > 1000) // > 1s
{
    printf("%ds", cnduration / 1000);
    cnduration = cnduration - (cnduration / 1000) * 1000;
}
if (cnduration < 1000)
{
    printf("%dms\n", cnduration);
}

[1] http://www.geeksforgeeks.org/how-to-measure-time-taken-by-a-program-in-c/