cc65/testcode/lib/div-test.c

/* div-test.c
**
** This program tests the division and modulo operators
** and the div() library function.
**
** 2002-10-24, Greg King
*/

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

static bool test(int dividend, int divisor) {
	div_t result;

       	result = div(dividend, divisor);
	printf("%+d/%+d= %+d, %+d%%%+d= %+d, div()= %+d, %+d\n",
		dividend, divisor, dividend / divisor,
		dividend, divisor, dividend % divisor,
		result.quot, result.rem);
	return result.quot * divisor + result.rem != dividend;
	}

int main(void) {
	bool t;

	printf("\nTest of division and modulus operations:\n\n");
	t =	test(+40, +3) ||
		test(+40, -3) ||
		test(-40, +3) ||
		test(-40, -3);
	if (t)
		printf("\nThe div() function made a wrong result!\n");
#ifdef __ATARI__
	/* Atari DOS 2 clears the screen after program-termination, so wait. */
	printf("\nTap a key, to exit. ");
	getchar();
#endif
	return (int)t;
	}