C++记录程序运行时间的四种方法

#include <iostream>  
#include <chrono>  
  
int main() {  
    auto start = std::chrono::high_resolution_clock::now();  
  
    // Your code here  
    // ...  
  
    auto stop = std::chrono::high_resolution_clock::now();  
    auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(stop - start).count();  
  
    std::cout << "Elapsed time: " << duration << " ms\n";  
  
    return 0;  
}

#include <iostream>  
#include <ctime>  
  
int main() {  
    clock_t start = clock(); //也可以double start = clock(); 
  
    // Your code here  
    // ...  
  
    clock_t end = clock();  
    double cpu_time_used = static_cast<double>(end - start) / CLOCKS_PER_SEC;
    //  /CLOCKS_PER_SEC将结果转为以秒为单位
  
    std::cout << "CPU time used: " << cpu_time_used << " s\n";  
  
    return 0;  
}

#include <boost/timer/timer.hpp>  
#include <iostream>  
  
int main() {  
    boost::timer::auto_cpu_timer t; // 自动测量和打印执行时间  
  
    // Your code here  
    // ...  
  
    return 0;  
}

#include <windows.h>  
#include <iostream>  
  
int main() {  
    DWORD start = GetTickCount();  
    // ... 执行你的代码 ...  
    DWORD end = GetTickCount();  
    std::cout << "程序运行时间: " << (end - start) << " 毫秒" << std::endl;  
    return 0;  
}

#include <windows.h>  
#include <iostream>  
  
int main() {  
    LARGE_INTEGER start, end, freq;  
    QueryPerformanceFrequency(&freq);  
    QueryPerformanceCounter(&start);  
    // ... 执行你的代码 ...  
    QueryPerformanceCounter(&end);  
    double elapsedTime = (double)(end.QuadPart - start.QuadPart) / freq.QuadPart * 1000.0; // 毫秒  
    std::cout << "程序运行时间: " << elapsedTime << " 毫秒" << std::endl;  
    return 0;  
}