6.22.8 difftime Function

Find the difference between two times.

Include

<time.h>

Prototype

double difftime(time_t t1, time_t t0);

Arguments

t1

ending time

t0

beginning time

Return Value

Returns the number of seconds between t1 and t0.

Remarks

By default, both MPLAB XC16 and XC-DSC compilers returns the time as instruction cycles so difftime returns the number of ticks between t1 and t0.

Example

See the notes at the beginning of this chapter or section for information on using printf() or scanf() (and other functions reading and writing the stdin or stdout streams) in the example code.

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

volatile int i;

int main(void)
{
  time_t start, stop;
  double elapsed;

  start = clock();
  for (i = 0; i < 10; i++)
    stop = clock();
  printf("start = %ld\n", start);
  printf("stop = %ld\n", stop);
  elapsed = difftime(stop, start);
  printf("Elapsed time = %.0f\n", elapsed);
}

Example Output

start = 0
stop = 317
Elapsed time = 317