A practice excercise from K&R. Kindly read the comments within the program. I'd be very grateful to people who helped. Why is it that I get the wierd face-like characters on the screen instead of the boolean output 0s or 1s?

Code:
#include <stdio.h>

/*This program is made to check that leaving the brackets around the epxression (c=getchar()) in 
the statement while ((c=getchar()) !=EOF) produces a boolean output in C which would either be 
0 (false) or 1 (true). This would happen because the relational operator != has precedence over the assignment
operator =.
*/

void main()
{

	int c;

	while (c=getchar() != EOF) putchar(c);

	/* Surprisingly, it doesn't produce zeros while I type; rather it produces some wierd characters that look
	half like zeros and half like smileys. And doing a Ctrl+Z, which I thought was the substitute for EOF does
	not produce a 1 (true value) */

}