Usage of ?: in c language

C language ?: operator, also known as ternary conditional operator, executes different code blocks according to conditions, syntax: condition ? true_expression : false_expression. It first evaluates the condition, and if it is true, executes the true code block, otherwise executes the false code block and returns the corresponding value. Specific uses include: conditional assignment, simplifying if-else statements, serving as function parameters, and assigning values ​​to different types. Pay attention to expression type compatibility and use parentheses to ensure correct evaluation of conditions.

Usage of ?: operator in C language

?: The operator, also known as the ternary conditional operator, is used in C language to execute different code blocks based on conditions. Its syntax is as follows:

<code class="c">condition ? true_expression : false_expression;</code>

where:

• condition is a Boolean expression that determines which code block to execute.
• true_expression is the block of code that executes when condition is true.
• false_expression is the block of code that executes when condition is false.

Working principle:

?: operator first evaluates condition, if true, then execute true_expression, otherwise execute false_expression. It returns the value of one of true_expression and false_expression, depending on whether condition is true or false.

Specific usage:

?: Operators can be used in various scenarios, for example:

• Conditional assignment:

  <code class="c">int x = condition ? 10 : 20;  // x 将被赋值为 10 或 20</code>

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• Simplified if-else statement:

  <code class="c">condition ? printf("True") : printf("False");  // 输出 "True" 或 "False"</code>

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• As a function parameter:

  <code class="c">int max(int a, int b) {
    return a > b ? a : b;  // 返回 a 和 b 中较大的一个
  }</code>

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• Assign different types:

  <code class="c">int x = condition ? 10.0 : 20;  // x 将是浮点数或整数，具体取决于 condition</code>

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Note: The types of

• true_expression and false_expression must be compatible. The
• ?: operator has higher precedence than the assignment operator, so parentheses must be used to ensure correct evaluation of the condition.

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