C Switch Statement: Usage Guide

The switch statement is used to execute different code blocks based on the value of an expression. Its usage is as follows:

switch (expression) {
    case value1:
        // 代码块1
        break;
    case value2:
        // 代码块2
        break;
    // 可以有任意数量的case
    default:
        // 默认的代码块
}

In a switch statement, the value of the expression is matched with the values in the case clauses. If a match is found, the corresponding code block is executed. If no case values match, the default code block (if any) is executed, otherwise the switch statement ends.

It is important to note that at the end of each case block, the ‘break’ statement should be added to avoid the phenomenon of fall-through (i.e. continuing to execute code blocks of other cases). If you want multiple cases to share the same code block, you can omit the ‘break’ statement.