Four Season

#include <stdio.h>
int main(void) {
  int month = 4;
  switch (month) {
    case 12: case 1: case 2:
      puts("冬です"); break;
    case 3: case 4: case 5:
      puts("春です"); break;
    case 6: case 7: case 8:
      puts("夏です"); break;
    case 9: case 10: case 11:
      puts("秋です"); break;
    default:
      break;
  }
  int mdiv = month / 3;
  if (mdiv == 0 || mdiv == 4) puts("冬です");
  else if (mdiv == 1) puts("春です");
  else if (mdiv == 2) puts("夏です");
  else puts("秋です");
  return 0;
}