Wierd output instead of 0s and 1s

From: Sathyaish (VisualBasicLearner_at_yahoo.com)
Date: 03/01/04 

Date: 1 Mar 2004 02:33:41 -0800

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?

#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) */

}