Thread: Simple EOF question

Hi,
I am currently studying K&R and I was looking at the example as follows:

Code:

#include <stdio.h>

main ()
{
    int c;

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

I am a little confused about the EOF. I checked and I am pretty sure that my EOF is -1 but when I input -1 in this program, the program doesn't end. -1 is treated just like the other characters. Am I missing something?