The role of default in c language

default is a keyword used in switch-case statements, executed when the expression does not match any case. It provides a general mechanism for handling all unhandled situations and is commonly used for error handling.

The role of default in C language

default is a keyword in C language, in switch-case used in statements. It represents the default action performed when there is no matching case in the switch-case statement.

Syntax

switch (expression) {
    case value1:
        // 代码块1
        break;
    case value2:
        // 代码块2
        break;
    default:
        // 默认代码块
        break;
}

Function

The default statement provides a way to handle all unhandled situations in the switch-case statement method. If the expression in the switch-case statement does not match any case, the code in the default block is executed.

Purpose

The default statement is usually used in the following situations:

• Provides a general mechanism for handling all unhandled input or situations.
• As a form of error handling.

Things to note

• The default statement is optional, but if there are multiple cases in the switch-case statement, it is best to include It handles unhandled situations.
• You can include a break statement before or after the default statement to terminate the switch-case statement and continue code execution from that point. If the break statement is not included, the default block and all following case blocks will be executed.
• The code in the default block can contain any legal C language statement.

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