Displaying Time to the Nearest Tenth of a Second

This is a discussion on Displaying Time to the Nearest Tenth of a Second within the C++ Programming forums, part of the General Programming Boards category; Hi, I'm trying to make this simple program that starts, and then when the user presses 1, it outputs the ...

  1. #1
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    Displaying Time to the Nearest Tenth of a Second

    Hi,

    I'm trying to make this simple program that starts, and then when the user presses 1, it outputs the length of time since the program started. Basically I want it to give the time accurate to a tenth of a second, but I can only work out how to do it to the nearest second at present. Can anyone help so that it outputs something like: "Time from when the program was run: 4.3 seconds."?

    Thanks.

    Code:
    #include <ctime>
    #include <iostream>
    #include <stdio.h>
    #include <conio.h>
    
    using namespace std;
    
    int main()
    {
        int c;
        time_t hold_time;
        hold_time = time(NULL);
    
        int time1 = hold_time;
        int time2 = hold_time+10;
    
        while (time1 < time2) 
        {
            hold_time = time(NULL);
            time1 = hold_time;
            c=kbhit();
    
            if (c != 0)
            {
                c = _getch();
                if (c == '1')
                    cout << "Time from when the program was run: " 
                         << (time1-time2) << " seconds." << endl;
            }
        }
    }

  2. #2
    and the Hat of Guessing tabstop's Avatar
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    Look into clock().

  3. #3
    and the hat of wrongness Salem's Avatar
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    But clock measures processor time, not wall-clock time.

    Getting sub-second accuracy for this problem needs something specific to your OS/Compiler.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  4. #4
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    Actually clock() did the job perfectly. Thanks.

  5. #5
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    Quote Originally Posted by bengreenwood View Post
    Actually clock() did the job perfectly. Thanks.
    Just be aware that the use of clock() for this purpose is likely to yiled the result "zero" if you use it in Linux or any other OS what clock() does what the C89 standard says that clock() should do.

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    EDIT: I take too long to type responses...

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