gistfile1.txt

#include <stdio.h>

#define test(n, op) do { \
	int value; \
	printf("Take %d (%s, x: %d, y: %d)\n", n, #op, x,y); \
	printf(#op ": %s ", (value = op) ? "TRUE" : "FALSE"); \
	printf(" X: %d Y: %d\n\n", x, y); \
} while(0)

int main(void) {
	int x=10, y=10;
	test(1, 5 != 2);
	test(2, 5 != 5);
	x = 5; y = 2;
	test(3, x =! y);
	x = 5; y = 5;
	test(4, x =! y);
	x = 5; y = 2;
	test(5, x != y);
	x = 5; y = 5;
	test(6, x != y);
}
Take 1 (5 != 2, x: 10, y: 10)
5 != 2: TRUE  X: 10 Y: 10

Take 2 (5 != 5, x: 10, y: 10)
5 != 5: FALSE  X: 10 Y: 10

Take 3 (x =! y, x: 5, y: 2)
x =! y: FALSE  X: 0 Y: 2

Take 4 (x =! y, x: 5, y: 5)
x =! y: FALSE  X: 0 Y: 5

Take 5 (x != y, x: 5, y: 2)
x != y: TRUE  X: 5 Y: 2

Take 6 (x != y, x: 5, y: 5)
x != y: FALSE  X: 5 Y: 5