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

It is possible to implement a "loop and a half" with it, although it might not be the best way to do it:

char password[100];
switch(0) do
{
  printf("Invalid password, try again.\n");
default:
  read_password(password, sizeof(password));
} while (!is_valid_password(password));