Solution for Exercise 21-10

ex2110

#include <stdio.h>
#include <time.h>

int main()
{
    time_t now,then;
    float delay=0.0;

    time(&then);
    puts("Start");
    while(delay < 1)
    {
        time(&now);
        delay = difftime(now,then);
        printf("%f\r",delay);
    }
    puts("\nStop");
    return(0);
}

Output

Start
1.000000
Stop

Notes

* Lamentably, on my system at least, the value is in whole seconds not fractional parts. So the effect of the while loop is to pause program execution for one second. Therefore:

* Modify the code so that the value 1 in Line 11 is changed to a higher value.

* You can also use the difftime() function to perform time math. The thought of doing so frightens me utterly.

Exercise ex2201 →