A program relative invocation of the system time.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <time.h>

clock_t clock(void);

None

This function is used to obtain values of type clock_t which may be used to calculate elapsed times during the execution of a program. To compute the elapsed time in seconds, divide the clock_t value by CLOCKS_PER_SEC, a macro defined in time.h.

The clock() function returns a clock_t type value representing the approximation of time since the system was started. There is no error value returned if an error occurs.

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

int main()
{
	clock_t start, end;
	double  secs = 0;
	int stop = 0;

	fprintf( stderr, "Press enter to start");
	getchar();
	start = clock();

	while(stop != 'x')
	{
		fprintf( stderr, "Press enter to end");
		getchar();
		end = clock();
		secs =  (double)(end - start) /CLOCKS_PER_SEC;
		fprintf( stderr, "Elapsed seconds = %f \n", secs);
		fprintf( stderr,"Press enter to start again ");
		fprintf(stderr, "or enter x to end:  ");		 stop = getchar();
		start = clock();
	}

	printf("\n** Program has terminated ** \n");
	return 0;
}
Output:
Press enter to start <enter>
Press enter to end <enter>
Elapsed seconds = 1.200000 
Press enter to start again or enter x to end: <enter>
Press enter to end <enter>
Elapsed seconds = 1.033333 
Press enter to start again or enter x to end: <x enter>

** Program has terminated ** 





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Last updated: August 16, 2000