c++ - 错误:全局范围没有 “clock”

Question

我想在程序中使用clock函数，所以我指的是how to use clock().

我的代码:

#include <iostream>
#include <cstdio>
#include <ctime>

int main() {
    std::clock_t start;
    //clock_t start;  
    double duration;

    start = std::clock();
    //start = clock(); //This Also not working

    /* Your algorithm here */

    duration = ( std::clock() - start ) / (double) CLOCKS_PER_SEC;
    //duration = ( clock() - start ) / (double) CLOCKS_PER_SEC;

    std::cout<<"printf: "<< duration <<'\n';
}

但是我仍然有编译错误

error C2039: 'clock' : is not a member of '`global namespace'' ....\ctime
error C2873: 'clock' : symbol cannot be used in a using-declaration ....\ctime
error C3861: 'clock': identifier not found ....\main.cpp

所以我也通过在Visual Studio中打开检查了 ctime头文件

using _CSTD asctime; using _CSTD clock; using _CSTD ctime;

对于这一行，它给出了一个错误

Error: the global scope has no "clock"

请帮我解决这些错误？

Answer 1

我已经研究了我的程序包含路径。我已经看到存在time.h的两个位置。

C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include
C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\include

替换了路径 time.h的 C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\include文件，该文件通过从另一个位置应对而引用了我的程序。