The role of default in C language switch statement

default is a special situation in C language switch statements. It is used to deal with situations where all case statements do not match switch conditions, ensuring that the switch statement always executes a branch to prevent unexpected behavior or code errors.

default in C language switch statement

default is a special case in C switch statements, used to deal with cases when the switch condition does not match any case statement. When all case statements in the switch statement do not match, execute the default branch.

effect

The purpose of default is to ensure that the switch statement always executes a branch, even if no case statement matching the condition is found. This helps prevent unexpected behavior or code errors.

use

The default branch is usually at the end of a switch statement, as follows:

 <code class="c">switch (x) { case 1: // 执行当x 为1 时需要执行的代码break; case 2: // 执行当x 为2 时需要执行的代码break; default: // 执行当x 不匹配任何其他case 语句时需要执行的代码break; }</code>

Notice:

• The default branch is optional, but is recommended, especially when the switch statement is used to handle finite ranges of values.
• When a matching case statement is not found, the default branch will always be executed, even if the condition is an invalid value.
• The default branch can contain the code to be executed or it can be empty.

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