switch(today){
      case '一':
      case '三':
      case '五':
          System.out.println("吃包子");
          break;
      case '二':
      case '四':
      case '六':
          System.out.println("吃油条");
          break;
      case '日':
          System.out.println("吃主席套餐");
          break;