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 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)
               }
           }