#include <stdio.h>
 
int main() {
  int a = 3;
  int b = 3;
  switch (a) {
  case 0:
    printf("aはゼロです\n");
    break;
  case 1:
    printf("aは1です\n");
    break;
  case 2:
    printf("aは2です\n");
  switch (b) {
    case 0:
      printf("bは0です\n");
    case 1:
      printf("bは1です\n");
    case 2:
      printf("bは2です\n");
    default:
      printf("aもbもゼロでも1でも2でもありません\n");
 
      break;
    }
    return 0;
  }
}
 

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