Java (do while)

比眉伴天荒 2022-09-24 11:27 143阅读 0赞

**①：迷你收款**

package Z1;
     
    import java.util.Scanner;
     
    public class Test {
        public static void main(String[] args) {
            Scanner input = new Scanner(System.in);
            System.out.println("*******************************");
            System.out.println("请选择购买的商品编号:");
            System.out.println("1.T恤\t2.网球鞋\t3.网球拍");
            System.out.println("*******************************");
            String xuan;
            double sum = 0;
            do {
               System.out.println("请输入要购买商品编号");
               int a = input.nextInt();
               System.out.println("请输入要购买商品数量");
               int b = input.nextInt();
               switch (a) {
               case 1:
               sum = 245 * b;
               break;
               case 2:
               sum = 300 * b;
               break;
              case 3:
              sum = 400 * b;
              break;
                }
         System.out.println("是否继续购买(y/n)");
         xuan = input.next();
         } while (xuan.equals('y'));
         System.out.println("折扣:0.8");
         System.out.println("应付金额:"+sum*0.8);
         System.out.print("交钱:");
         double num = input.nextDouble();
         System.out.println("找钱:"+(num-sum*0.8));
       }
    }

**②：升级版计算器**

import java.util.Scanner;
    
    public class Test1 {
    
     public static void main(String[] args) {
      Scanner input = new Scanner(System.in);
      String flag = "y";
      do {
       System.out.println("=========选择计算========");
       System.out.println("1.计算器");
       System.out.println("2.面积计算");
       System.out.println("3.退出");
       System.out.println("=====输入您要选择的功能=====");
       int i = input.nextInt();
       double result = 0;
       switch (i) {
       case 1:
        do {
         System.out.println("=======计算器======");
     
         System.out.println("1.+");
     
         System.out.println("2.-");
     
         System.out.println("3.*");
     
         System.out.println("4./");
     
         System.out.println("5.返回主菜单");
     
         System.out.println("6.退出");
     
         System.out.println("=================");
     
         System.out.println("请选择:");
     
         i = input.nextInt();
     
         if (i < 5) {
     
          System.out.println("请输入第一个数");
     
          double a = input.nextInt();
     
          System.out.println("请输入第二个数");
     
          double b = input.nextInt();
     
          switch (i) {
          case 1:
    
           result = a + b;
           break;
          case 2:
           result = a - b;
           break;
          case 3:
           result = a * b;
           break;
          case 4:
           result = a / b;
           break;
          case 5:
           break;
          default:
           flag = "n";
           break;
          }
         }
         System.out.println(result);
        } while (i < 5);
       case 2:
     
        do {
     
         System.out.println("=======计算面积=====");
     
         System.out.println("1.三角形");
     
         System.out.println("2.圆形");
     
         System.out.println("3.长方形");
     
         System.out.println("4.返回主菜单");
     
         System.out.println("5.退出");
     
         System.out.println("=================");
     
         System.out.println("请选择:");
     
         i = input.nextInt();
     
         switch (i) {
     
         case 1:
     
          System.out.println("请输入三角形的底");
     
          double c = input.nextDouble();
     
          System.out.println("请输入三角形的高");
     
          double d = input.nextDouble();
     
          result = c * d * 0.5;
     
          break;
     
         case 2:
     
          System.out.println("请输入圆的半径");
          double e = input.nextDouble();
          result = 3.14 * e * e;
          break;
     
         case 3:
     
          System.out.println("请输入长方形的底");
          double f = input.nextDouble();
          System.out.println("请输入长方形的高"); 
          double g = input.nextDouble(); 
          result = f * g;
          break;
     
         case 4:
     
          break;
         default:
          flag = "n";
          break;
     
         } 
         System.out.println(result);
        } while (i < 4);
        break;
       }
      } while (flag.equals('y'));
      System.out.println("您已退出");
     }
    }