Quick OR operator question

I am learning Obj C and I tried my own version of the 'OR' operator from the book I am learning from. I simply am having the NSLog display text if the person presses a key that is 'a' through 'n'. If they don't the 'while' loop returns them to the question. Everything works but if they press a key that is out of the range it runs the loop twice again before I can use the 'scanf' again to enter a new character. It's like the Loop is stuck in a loop. Here is the code.

Code:

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

	char crit;
	int testNum = 0;
	
	while ( testNum == 0)
	{
	NSLog(@"What was the Crit:");
	scanf("%c", &crit);
		
		if ( crit < 'a' || crit > 'm')
	
			NSLog(@"That is not a correct responce");
	
		else
			testNum++;
	}
	
	NSLog(@"You selected %c", crit);
	
	
    [pool drain];
    return 0;
}

Any help would be great!

 

Thanks. I'm still new to Programing and I am not sure what newline is. If is a character's ASCII number representation?

-Lars

 

Thanks for those links.

-Lars