Valid, but worthless syntax in switch-case?

Question

Through a little typo, I accidentally found this construct:

int main(void) {
    char foo = \'c\';

    switch(foo)
    {
        printf(\"Cant Touch This\\n\");         


        

Answer 1

Not only for variable declaration but advanced jumping as well. You can utilize it well if and only if you're not prone to spaghetti code.

int main()
{
    int i = 1;
    switch(i)
    {
        nocase:
        printf("no case\n");

        case 0: printf("0\n"); break;
        case 1: printf("1\n"); goto nocase;
    }
    return 0;
}

Prints

1
no case
0 /* Notice how "0" prints even though i = 1 */

It should be noted that switch-case is one of the fastest control flow clauses. So it must be very flexible to the programmer, which sometimes involves cases like this.