What does case mean in c language

case is a conditional judgment keyword in C language, which is used in switch statements to branch to different code blocks for execution based on the value specified by the expression. It allows a program to choose to execute different pieces of code based on given conditions.

#What does case mean in C language?

case in C language is a keyword used to make conditional judgments in switch statements. It allows the program to branch to different blocks of code based on specified conditions.

Syntax:

<code class="c">switch (expression) {
  case value1:
    // 代码块 1
    break;
  case value2:
    // 代码块 2
    break;
  // ...
  default:
    // 默认代码块
    break;
}</code>

Usage:

1. Expression: switch statement The expression can be any integer or character value.
2. case tag: Each case tag represents a value that needs to be checked.
3. Code block: When the expression matches the case label, the corresponding code block is executed.
4. break statement: break statement is used to jump out of the switch statement to prevent other case labels from continuing to execute.
5. default tag: The default tag is optional and is used to handle situations where the expression does not match any case tag.

Example:

<code class="c">int num = 5;

switch (num) {
  case 1:
    printf("数字是 1\n");
    break;
  case 2:
    printf("数字是 2\n");
    break;
  case 5:
    printf("数字是 5\n");
    break;
  default:
    printf("数字不在 1、2 或 5 内\n");
}</code>

Output:

<code>数字是 5</code>

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