difftime

Finds the difference between two times.

double difftime( time_t timer1, time_t timer0 );

For additional compatibility information, see Compatibility in the Introduction.

Libraries

Return Value

difftime returns the elapsed time in seconds, from timer0 to timer1. The value returned is a double-precision floating-point number.

Parameters

timer1

Ending time

timer0

Beginning time

Remarks

The difftime function computes the difference between the two supplied time values timer0 and timer1.

Example

/* DIFFTIME.C: This program calculates the amount of time
 * needed to do a floating-point multiply 10 million times.
 */

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

void main( void )
{
   time_t   start, finish;
   long loop;
   double   result, elapsed_time;

   printf( "Multiplying 2 floating point numbers 10 million times...\n" );
   
   time( &start );
   for( loop = 0; loop < 10000000; loop++ )
      result = 3.63 * 5.27; 
   time( &finish );

   elapsed_time = difftime( finish, start );
   printf( "\nProgram takes %6.0f seconds.\n", elapsed_time );
}

Output

Multiplying 2 floats 10 million times...

Program takes      2 seconds.

Floating-Point Support Routines |  Time Management Routines

See Also   time