试图计算两次之间的差值，不会减去 [英] Trying to calculate difference between two times, won't subtract

问题描述

我的程序所做的是首先打印当前时间，然后用户按enter键。然后，它再次打印出时间，并计算用户等待输入的时间。

What my program does is that it first prints the current time, then the user presses enter. Afterwards it prints out the time again and calculates how long the user waited to press enter.

我无法得到我的时间减去。我得到的代码打印本地时间从stackoverflow中的另一个问题。

I can't get my time to subtract. I got the code for printing the local time from another question in stackoverflow.

#include <iostream>
#include <ctime>
using namespace std;

void main()
{
    time_t rawtime;
    struct tm * timeinfo;

    time ( &rawtime );
    timeinfo = localtime ( &rawtime );
    printf ( "Current local time and date: %s", asctime (timeinfo) );

    cout << "Press enter" << endl;
    cin.ignore();

    time_t rawtime2;
    struct tm * timeinfo2;

    time ( &rawtime2 );
    timeinfo2 = localtime ( &rawtime2 );
    printf ( "Later local time and date: %s", asctime (timeinfo2) );

    printf ( "You took %s", ( asctime (timeinfo2) - asctime (timeinfo) ) ); //math won't work here
    printf ( " seconds to press enter. ");
    cout << endl;
}

推荐答案

cout << "Elapsed time: " << rawtime2 - rawtime << " seconds" << endl;

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