difftime()               Find the Difference between Two Times
 
 #include <time.h>
 
 double     difftime(time2,time1);
 time_t     time2;                       Type 'time_t' defined in <time.h>
 time_t     time1;                       Type 'time_t' defined in <time.h>
 
 
    Difftime() computes the difference between 'time2' and 'time1'.
 
    Returns:    A double precision number representing the elapsed time in
                seconds of 'time2' - 'time1'.
 
  -------------------------------- Example ---------------------------------
 
    The following statements open a file, set the start time, process the
    file, set the end time, then find out how much time it took to process
    the file.
 
          #include <time.h>
          #include <stdio.h>
 
          time_t   time1, time2;
          FILE     *in;
          int      x;
 
          main()
          {
              if ((in = fopen("acct.dat","w+")) != NULL) {
                   time(&time1);
                   for (x = 1; x < 15000; x++)
                       fputc(x,in);
                   rewind(in);
                   while (!feof(in)) {
                       fgetc(in);
                   }
                   time(&time2);
                   printf("Time it took to process the file: %f\n",
                           difftime(time2,time1)
              }
           }

Seealso:


 time()