Question

想知道是否有人可以帮助我将“If else声明”更改为“切换” 那么伪代码就是。请帮忙。

IF month is 1,2, or 3, season = "Winter
Else if month is 4, 5, or 6, season = "Spring"
Else if month is 7,8, 9, season = "Summer"
Else if month is 10,11, or 12, season = "Fall"
If season is "Winter", season = "Spring"
Else if season is "Spring", season = "Summer"
Else if season is "Summer", season = "Fall"
Else season = "Winter"

2.我的代码是

   import java.util.Scanner;
    public class mylab

     {
      public static void main(String[] args) 

      { Scanner in = new Scanner(System.in);

        int month;
        int day;
        String season= "seasons";


         System.out.print("type a two digit month");
         System.out.print(" and day");
         month = in.nextInt();
         day = in.nextInt();


        String fall = " fall";
        String winter = " winter ";
        String summer = " summer";
        String spring = " spring";

      System.out.print(" Month="+ month +" Day= "+day);

      if( month <= 3)
      { System.out.println(" Winter");   
        season= winter; }
        else if ( month <=6)
        { System.out.println(" Spring ");   
          season=spring;  }

         else if ( month<= 9)
        { System.out.println(" Summer ");  
           season= spring; }

          else if ( month<=12)
         { System.out.println(" Fall");   
            season= fall; }

3.我只需要将第1部分更改为switch语句。这就是我到目前为止所拥有的

switch( month )
  { case 1: season= " winter";if ( month <= 3) ;break;
    case 2: season= " spring"; if ( month <= 6) ;break;
    case 3: season = " summer"; if (month  <= 9); break;
    case 4: season= " fall"; if (month <= 12); break ;
  }

，但它不起作用。

Answer 1

如果月份为1,2或3，则赛季=“冬季

会变成......

String season = "";
switch (month) {
    case 1:
    case 2:
    case 3:
        season = "Winter";
        break;
    case ...: // etc...
}

除非case

，否则

case会落到下一个break

请查看The switch Statement了解详情

Answer 2

某些整数除法怎么样？

switch( (month + 2) / 12 ) {
    case 1:
        // winter
        break;
    case 2:
        // spring
        break; // WOOHOO SPRING BREAK!
    case 3:
        // summer
        break;
    case 4:
        // fall
        break;  // winter is coming...
    default:
        break;
}

Answer 3

提示：

您需要两个switch语句。一个用于第一个if / else链，一个用于第二个。（虽然你可以轻松地将两条链折叠成一条！）
Java教程here中说明了switch语句的语法。
以下声明不执行任何操作：
```
  if ( month <= 3) ;
```
它说“测试月份是否小于或等于3，然后执行空语句。这是Java语法中的”gotcha！“ ...以及一些原因之一人们认为你应该总是在Java和类似语言中使用if和loop语句的大括号。

将“If else语句”更改为switch语句

3 个答案: