How to use switch statement in c++

The switch statement is a control flow statement used to execute different blocks of code based on the value of a variable or expression. The syntax is: switch (variable) { case value1: // Code block for value 1 break; ... default: // Default code block to be executed if the variable does not match any case }. It is often used to select actions based on values, select code paths based on state or input, or create menu-driven programs.

The switch statement in C

What is the switch statement?

The switch statement is a control flow statement used to execute different blocks of code based on the value of a variable or expression.

Syntax:

<code class="cpp">switch (variable) {
  case value1:
    // 针对值 1 的代码块
    break;
  case value2:
    // 针对值 2 的代码块
    break;
  ...
  default:
    // 如果变量不匹配任何 case，则执行的默认代码块
}</code>

Working principle:

• variable is to be checked variable or expression. The
• case statement specifies each value to match. The
• break statement is used to exit the current case block and continue executing subsequent code.
• default block is optional and is used to handle all values ​​that do not match any case.

Usage:

The switch statement is usually used in the following situations:

• Select different operations based on the value.
• Select different code paths based on status or input.
• Create menu-driven programs.

Example:

The following example shows how to use a switch statement to perform different actions based on user input:

<code class="cpp">#include <iostream>

int main() {
  int choice;

  std::cout << "请选择以下选项：" << std::endl;
  std::cout << "1. 添加" << std::endl;
  std::cout << "2. 减法" << std::endl;
  std::cout << "3. 乘法" << std::endl;
  std::cout << "4. 除法" << std::endl;

  std::cin >> choice;

  switch (choice) {
    case 1:
      // 执行加法操作
      break;
    case 2:
      // 执行减法操作
      break;
    case 3:
      // 执行乘法操作
      break;
    case 4:
      // 执行除法操作
      break;
    default:
      // 输入无效
      std::cout << "无效选项" << std::endl;
  }

  return 0;
}</code>

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