case-inside-do.c

#include <stdio.h>

int main()
{
  char *s;

  switch (getchar()) {
    do {
    case '0':
      s = "zero";
      break;
    case '1':
      s = "one";
      break;
    } while (0);
    puts(s);
    break;
  default:
    puts("x");
  }
}