Switch case

`switch case` 是一种控制流语句，用于根据表达式的值选择不同的执行路径。它通常用于多分支条件语句中，比如需要根据用户输入的选项执行不同的操作。

`switch case` 语法如下：

switch(expression){
    case value1:
        // 当 expression 的值等于 value1 时执行的代码
        break;
    case value2:
        // 当 expression 的值等于 value2 时执行的代码
        break;
    ...
    default:
        // 当所有 case 的值都不匹配时执行的代码
        break;
}

在使用 `switch case` 语句时，首先需要指定一个表达式 `expression`，该表达式的值将会被用来匹配后面的各个 case 值。当表达式的值与某个 case 值相同时，将会执行该 case 后面的代码块，并且在代码末尾使用 `break` 关键字来跳出整个 `switch case` 语句。如果所有的 case 都没有匹配到，将会执行 `default` 后面的代码块。

相关问题

switchcase

switch是一种流程控制语句，用于根据不同的情况执行不同的代码。它通常与break语句一起使用，以在满足某个条件时终止switch case语句的执行。以下是一个简单的示例：

int day = 3;
switch (day) {
  case 1:
    cout << "Monday";
    break;
  case 2:
    cout << "Tuesday";
    break;
  case 3:
    cout << "Wednesday";
    break;
  default:
    cout << "Invalid day";
}

在上面的示例中，我们使用switch case语句根据day变量的值来选择要执行的代码块。由于day的值为3，因此输出将是“Wednesday”。如果day的值不是1、2或3，则执行default语句块。

switch case

Switch case is a programming construct used in many programming languages, including C++, Java, and Python, that allows a program to execute different blocks of code depending on the value of a variable or an expression.

The switch statement evaluates an expression or variable and compares it with a series of case values. If the expression matches a case value, the corresponding block of code is executed. If the expression does not match any of the case values, the default block of code is executed.

Here is an example of a switch case statement in C++:

int day = 2;
switch (day) {
    case 1:
        cout << "Monday" << endl;
        break;
    case 2:
        cout << "Tuesday" << endl;
        break;
    case 3:
        cout << "Wednesday" << endl;
        break;
    default:
        cout << "Invalid day" << endl;
        break;
}

In this example, the switch statement evaluates the value of the variable `day`. If `day` is equal to 1, the program executes the code in the first case block, which outputs "Monday". If `day` is equal to 2, the program executes the code in the second case block, which outputs "Tuesday". If `day` is equal to 3, the program executes the code in the third case block, which outputs "Wednesday". If `day` does not match any of the case values, the program executes the default block, which outputs "Invalid day". The `break` statement at the end of each case block is used to exit the switch statement and prevent the program from executing the code in the other case blocks.