Thread: Not able to compare a char variable

First of all, hello everyone.

I'm pretty much a virgin, here and in programming.

So the problem is:

Code:

do
	{
	printf("Introduza o nome do contacto(max. 32 caracteres):\n");
	getchar();
	gets(contacto1.nome);

	printf("Introduza o número de telefone:\n");
	scanf("%d", &contacto1.num);

	printf("Introduza a Data de Aniversário(dd/mm/aaaa):\n"); //É preciso implementar verificação de data correcta
	for(i=0;i<12;i++)
	{
		scanf("%c", &contacto1.bday[i]);
	}

	printf("Os dados são:\nNome: %s\nNúmero: %d\nData de Nascimento: ", contacto1.nome, contacto1.num);
	for(i=0;i<12;i++)
	{
		printf("%c", contacto1.bday[i]);
	}
	printf("\nPretende guardar este contacto?(S\\N)\n");
	scanf("%c", &o);
	
	}while(o!='S' || o!='s');

when I'm trying to terminate the loop by answering "S" or "s" it doesn't terminate. It just goes on and on, no matter what I input to $o. Can anyone explain me why it doesn't break the loop?

Thank you and sorry for my english. I'm portuguese as you can see by the piece of code in there.