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What is the format of switch statement?

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coldplay.xixiOriginal
2020-12-22 11:15:2229524browse

The switch statement format is [switch (expression) {case value 1: statement body 1; break; case value 2: statement body 2; break;]; where break means interrupt, and all values ​​are When there is no match, the statement body default is executed.

What is the format of switch statement?

The switch statement format is:

1. The switch statement format is:

         switch(表达式){
           case 值1:
              语句体1;
                 break;
                 case 值2:
                语句体2;
                 break;
                ...
                  default:
                  语句体n+1;
                   break;
           }

2. Format explanation:

Expression: byte, short, int, char

  • The value after case: just use To match the value of the expression

  • break: The meaning of table interruption

  • default: When all values ​​do not match , Perform the statement default;

## 3. The execution process:

A: First calculate the value of the expression

B: Compare this calculated value with the value after the case in turn. Once there is a match, execute the corresponding statement and end when encountering break.

C: If all cases are not matched, execute the statement n 1

## 4. Example code:

                        Scanner sc= new Scanner(System.in);
                        System.out.println("请输入数字1-7");
                       int i = sc.nextInt();
                       switch(i) {
                                            case 1:
                                            System.out.println("星期一");
                                            break;
                  case 2:
                     System.out.println("星期二");
                     break;
                  case 3:
                       System.out.println("星期三");
                    break;
                  case 4:
                      System.out.println("星期四");
                      break;
                  case 5:
                    System.out.println("星期五");
                    break;
                  case 6:
                    System.out.println("星期六");
                    break;
                case 7:
                    System.out.println("星期天1");
                    break;
                    default:
                        System.out.println("请输入正确数字:");
                  break;

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