Timer Concept Using Preprocessor

#include <time.h>

#include <stdlib.h>

clock_t startm, stopm;

#define START if ( (startm = clock()) == -1) {printf("Error calling clock");exit(1);}

#define STOP if ( (stopm = clock()) == -1) {printf("Error calling clock");exit(1);}

#define PRINTTIME printf( "%6.3f seconds used by the processor.", ((double)stopm-startm)/CLOCKS_PER_SEC);

Usage:

main() {

     START;

     // Do stuff you want to time

     STOP;

     PRINTTIME;

}