Thread: Switch inside While issues

I'm trying to make a very basic program that is supposed to mimic a tv of sorts, its supposed to be for learning switch statements, and i am supposed to do it within a while loop. Here is what i have.

Code:

#include <stdio.h>

int chan = 5, i = 4;
char rem;

int main (int argc, char * const argv[]) {
    while (i){
		printf("\nCurrent channel: %d", chan);
		printf("\nUse your remote (e,p,s,m,c):");
		scanf("%c",&rem);
		switch (rem){
			case 'e':
				return 0;
				break;
			case 'm':
				printf("Muted");
				getchar();
				break;
			case 'p':
				printf("Playing");
				getchar();
				break;
			case 's':
				printf("Stopping");
				getchar();
				break;
			case 'c':
				printf("\nEnter Desired Channel: ");
				scanf("%d",&chan);
				break;
				
		}
	}
	
		
			
    return 0;
}

My problem seems to be that it skips the scanf within the loop everytime i write to the variable chan. Any ideas why? I realize i need a default but that didn't seem to fix anything, and will be added.

Because "enter-key" is a perfectly good character, but not part of a perfectly good integer. So when you hit "8 enter-key" at the prompt, the 8 is eaten but the enter-key is left behind for the next scanf.

Probably the easiest fix is to tell the second read to ignore spaces/enter-keys by using a space:

Code:

scanf(" %c", &rem);

Thanks alot guys ill try those 2 things. Thats alot!

Originally Posted by MK27

Okay, so AFAIK there is this other slightly nicer fix (thanks tabstop) but it still looks like a hack.

That may be true, but the advantage is that every single getchar() call in the program goes away, AFAICT.

The space in the scanf worked great. Thanks for the quick reply!