C++运行时间计算

简介：只要会C++就能看懂的程序就不解释了

#include <time.h>
#include <iostream>
int fun()
{
    for (int i = 0; i < 100; i++)
    {
        for (int j = 0; j < 100; j++)
        {
            std::cout << i + j;
        }
    }
    return 0;
}
int main()
{
    clock_t start_time = clock();//记录起始时间
    fun();
    clock_t end_time = clock();//记录结束时间
    auto run_time = double(1000 * (end_time - start_time)) / CLOCKS_PER_SEC;//单位为毫秒
    std::cout << "run time: " << run_time << "ms\n";
    return 0;
}