Very simple C question using getchar() and putchar()

Question

Hello I am teaching myself C and going through the K & R book and I am having some trouble (I am running OS X). This is from section 1.5.1 "File Copying" which is supposed to take a character as input, then output the character. Here is the code:

#include <stdio.h>

/* --  Copy input to output -- */ 
int main(void)
{
int c;

c = getchar();

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


}

So, I think my problem is not with the code itself but with compling and running. First of all, when compiling I get the following errors

/Volumes/Goliath/Dropbox/C programs/prog1_5_1.c: In function ‘main’:
/Volumes/Goliath/Dropbox/C programs/prog1_5_1.c:12: warning: assignment makes integer from pointer without a        cast
/Volumes/Goliath/Dropbox/C programs/prog1_5_1.c:16: warning: control reaches end of non-void function

Then when I run the output file (in terminal) it has a small space, then when I input a letter, say I type

a

then I hit Return

and I get a new line. If I then hit a new key, the screen starts going crazy with question marks all over the place.

I am not sure if I am making much sense but I am finding this an odd problem to have. Thank you very much in advance