#include <time.h>  // clock(), clock_t, CLK_TCK
#include <stdio.h> // printf()
#include <conio.h> // gotoxy()

#define REPS_1 (100000000L)
#define REPS_2 (10000000L)
#define REPS_3 (100000L)

int main(void)
{

	long i;
	clock_t start, stop;
	double passtime;

	// Time an empty loop for reference purposes
	start = clock();
	for(i = 0; i < REPS_1; i++)
		;
	stop = clock();
	gotoxy(1, 2);
	printf("Start, Stop : ");
	printf("<%li, %li>\n", (long) start, (long) stop);
	passtime = ((double)(stop - start)/(double) CLK_TCK) / (double) REPS_1;
	printf("Time to execute each pass of empty loop: ");
	printf("%.3f us\n", 1e6*passtime);

	// Time loop that moves the screen cursor
	start = clock();
	for(i = 0; i < REPS_2; i++)
		gotoxy(10,24);
	stop = clock();
	gotoxy(1, 5);
	printf("Start, Stop : ");
	printf("<%li, %li>\n", (long) start, (long) stop);
	passtime = ((double)(stop - start)/(double) CLK_TCK) / (double) REPS_2;
	printf("Time to execute each pass of loop with screen cursor move: ");
	printf("%.3f us\n", 1e6*passtime);

	// Time loop that outputs a character to the screen
	start = clock();
	for(i = 0; i < REPS_3; i++)
	{
		gotoxy(10,24);
		printf("*");
	}
	stop = clock();
	gotoxy(1, 8);
	printf("Start, Stop : ");
	printf("<%li, %li>\n", (long) start, (long) stop);
	passtime = ((double)(stop - start)/(double) CLK_TCK) / (double) REPS_3;
	printf("Time to execute each pass of loop with screen output: ");
	printf("%.3f us\n", 1e6*passtime);

	// Time loop that outputs ten characters to the screen
	start = clock();
	for(i = 0; i < REPS_3; i++)
	{
		gotoxy(10,24);
		printf("0123456789");
	}
	stop = clock();
	gotoxy(1, 11);
	printf("Start, Stop : ");
	printf("<%li, %li>\n", (long) start, (long) stop);
	passtime = ((double)(stop - start)/(double) CLK_TCK) / (double) REPS_3;
	printf("Time to prints ten characters: ");
	printf("%.3f us\n", 1e6*passtime);

	// Time loop that outputs ten characters to the screen with two calls
	start = clock();
	for(i = 0; i < REPS_3; i++)
	{
		gotoxy(10,24);
		printf("01234");
		printf("56789");
	}
	stop = clock();
	gotoxy(1, 14);
	printf("Start, Stop : ");
	printf("<%li, %li>\n", (long) start, (long) stop);
	passtime = ((double)(stop - start)/(double) CLK_TCK) / (double) REPS_3;
	printf("Time to printf 2x5 characters: ");
	printf("%.3f us\n", 1e6*passtime);

	return(0);

}