C++实现获取系统时间的方法小结

#include <iostream>
#include <sys/time.h>
 
int main() {
    struct timeval start, end;
    double totalTime;
 
    gettimeofday(&start, NULL);
 
    // 在这里执行代码
    ...
 
    gettimeofday(&end, NULL);
 
    totalTime = (end.tv_sec - start.tv_sec) + (end.tv_usec - start.tv_usec) / 1000000.0;
 
    std::cout << "Total time: " << totalTime << " seconds" << std::endl;
 
    return 0;
}

#include <iostream>
#include <time.h>
 
int main() {
    struct timespec start, end;
    double totalTime;
 
    clock_gettime(CLOCK_MONOTONIC, &start);
 
    // 在这里执行代码
    ...
 
    clock_gettime(CLOCK_MONOTONIC, &end);
 
    totalTime = (end.tv_sec - start.tv_sec) + (end.tv_nsec - start.tv_nsec) / 1e9;
 
    std::cout << "Total time: " << totalTime << " seconds" << std::endl;
 
    return 0;
}

#include <iostream>
#include <windows.h>
 
int main() {
    LARGE_INTEGER frequency, start, end;
    double totalTime;
 
    QueryPerformanceFrequency(&frequency);
 
    QueryPerformanceCounter(&start);
 
    // 在这里执行代码
    ...
 
    QueryPerformanceCounter(&end);
 
    totalTime = static_cast<double>(end.QuadPart - start.QuadPart) / frequency.QuadPart;
 
    std::cout << "Total time: " << totalTime << " seconds" << std::endl;
 
    return 0;
}

#include <iostream>
#include <chrono>
 
int main() {
    auto start = std::chrono::high_resolution_clock::now();
 
    // 在这里执行代码
    ...
 
    auto end = std::chrono::high_resolution_clock::now();
 
    std::chrono::duration<double> totalTime = end - start;
 
    std::cout << "Total time: " << totalTime.count() << " seconds" << std::endl;
 
    return 0;
}

#include <iostream>
#include <ctime>
 
int main() {
    clock_t start = clock();
 
    // 在这里执行代码
    ...
 
    clock_t end = clock();
 
    double totalTime = static_cast<double>(end - start) / CLOCKS_PER_SEC;
 
    std::cout << "Total time: " << totalTime << " seconds" << std::endl;
 
    return 0;
}