difftime() Library Function in C

difftime() is a C Library function. It returns the difference in time, in seconds(i.e. ending time – starting time). It is present in the <time.h> header file. 

Syntax: 

double difftime(time_t time2, time_t time1);

Parameters:

• time1: Lower bound of the time interval whose length is calculated.
• time2: Higher bound of the time interval whose length is calculated.

Return Value: Returns the difference between time1 and time2 (as measured in seconds).

Example:

C

// C program to demonstrate working of
// difftime()
#include <stdio.h>
#include <time.h>
#include <unistd.h>

// Driver Code
int main()
{
    int sec;
    time_t time1, time2;

    // Current time
    time(&time1);
    for (sec = 1; sec <= 6; sec++)
        sleep(1);

    // time after sleep in loop.
    time(&time2);
    printf("Difference is %.2f seconds",
           difftime(time2, time1));

    return 0;
}

Output

Difference is 6.00 seconds

Exception in difftime():

It never throws an exception.

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