default and break in C switch statement

In the C language switch statement: the default branch processes all unmatched cases, usually placed at the end. The break statement exits the switch statement and continues with subsequent code, each branch should end with break.

default and break in C language switch statements

default:

• The default branch is used to handle all other cases, i.e. when there is no matching case.
• The default branch can be placed anywhere in the switch statement, but is usually placed at the end.

break:

• The break statement is used to exit the switch statement.
• Each case branch and default branch should end with a break statement. This will pop up the switch statement and continue to execute the following code.
• If there is no break statement, the program will continue to execute subsequent case branches until the break statement or switch statement is encountered.

Example:

 <code class="c">switch (ch) { case 'a': printf("选项a 已被选择。\n"); break; case 'b': printf("选项b 已被选择。\n"); break; default: printf("无效选项。\n"); break; }</code>

use:

• default: Used to handle all cases not explicitly handled in switch, ensuring there is a default handling method.
• break: Used to exit the switch statement and continue to execute subsequent code. This helps prevent accidental execution of subsequent case branches.

The above is the detailed content of default and break in C switch statement. For more information, please follow other related articles on the PHP Chinese website!