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Synopsis:
    #include <time.h>
    clock_t clock(void);

Description:
    The clock function returns the number of clock ticks of processor time
    used by program since the program started executing.  This can be
    converted to seconds by dividing by the value of the macro
     CLOCKS_PER_SEC.

Returns:
    The clock function returns the number of clock ticks that have occurred
    since the program started executing.

See Also:
    asctime Functions, ctime Functions, difftime, gmtime Functions, localtime Functions, mktime, strftime, time,
    tzset

Example:
    #include <stdio.h>
    #include <math.h>
    #include <time.h>

    void compute( void )
      {
        int i, j;
        double x;

        x = 0.0;
        for( i = 1; i <= 100; i++ )
          for( j = 1; j <= 100; j++ )
            x += sqrt( (double) i * j );
        printf( "%16.7f\n", x );
      }

    void main()
      {
        clock_t start_time, end_time;

        start_time = clock();
        compute();
        end_time = clock();
        printf( "Execution time was %lu seconds\n",
              (end_time - start_time) / CLOCKS_PER_SEC );
      }

Classification:
    ANSI

Systems:
    All