5回答

• 

  5元

  2020-06-07 20:38:52

  int i = 1;

  Scanner nc = new Scanner(System.in);

  System.out.print("请输入数字:");

  do {

  int x = nc.nextInt();

  i++;

  if (x == 1) {

  System.out.println("A");

  } else if (x == 2) {

  System.out.println("B");

  } else {

  System.out.print("请重新尝试输入:");

  x = nc.nextInt();

  }

  
  

  } while (true);

  // 只能重复输入一次，之后就要重新运行了

  0 0
• 

  芒果味的琦宝

  2020-05-06 14:48:42

  干嘛用break呢，你都在跳出来了，还怎么进去

  0 0
• 

  芒果味的琦宝

  2020-05-06 14:47:46

  package day_1;

  
  

  import java.util.Scanner;

  
  

  public class aa {

  
  

  public static void main(String[] args) {

  int i = 1;

  Scanner nc = new Scanner (System.in);

  System.out.println("请输入数字");

  do{int x=nc.nextInt();

  i++;

  if (x==1) {System.out.println("A");

  System.out.println(i);

  }else if(x==2){

  System.out.println("B");

  System.out.println(i);

  }else {

  System.out.println("请重新尝试输入____");

  System.out.println(i);

  }

  }while(i+1<=4);

  }

  }

  
  

  0 0
• 

  weibo_慕莱坞7212575

  2020-03-09 12:32:01

  //这个是规范的写法：

  import java.util.Scanner;

  
  

  public class Do_while03 {

  
  

  public static void main(String[] args) {

  // 键盘录入

  Scanner nc = new Scanner(System.in);

  System.out.println("请输入数字");

  // x值不等于1或2时,实现重新接收键盘输入的数字

  do {

  int x = nc.nextInt();// 接收键盘录入的数据

  if (x == 1) {

  System.out.println("A");

  break;

  } else if (x == 2) {

  System.out.println("B");

  break;

  } else {

  System.out.println("请重新尝试输入____");

  } // 此处的大括号容易被丢

  } while (true);

  }

  }

  
  

  0 0
• 

  weibo_慕莱坞7212575

  2020-03-09 12:21:29

  import java.util.Scanner;

  
  

  public class Do_while03 {

  
  

  public static void main(String[] args) {

  //键盘录入

  Scanner nc = new Scanner (System.in);

  System.out.println("请输入数字");

  //x值不等于1或2时,实现重新接收键盘输入的数字

  do{int x=nc.nextInt();//接收键盘录入的数据

  if (x==1) {System.out.println("A");

  break;

  }else if(x==2){System.out.println("B");

  break;

  }else {

  System.out.println("请重新尝试输入____");

  }//此处的大括号容易被丢

  }while(true);//单词错误

  }

  }

  
  

  0 0