difftime() C library function

The C library function difftime() returns the difference, in seconds between starting time and ending time.(ending time-starting time)

// It is present in time.h header file
#include 

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).

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

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