What does double vertical bar mean in C language

Double vertical bar (||) represents a logical OR operation in C language, which is used to determine that at least one of the two Boolean expressions is true, otherwise it will return false. Syntax: expression || expression, where expression is a boolean expression.

What does double vertical bar represent in C?

The double vertical bar (||) operator represents logical OR operations in C.

Logical OR operation

The logical OR operation operates on two boolean values ​​(true or false) and returns the boolean value according to the following rules:

• If both inputs are true, the result is true.
• If one of the inputs is true, the result is true.
• If both inputs are false, the result is false.

grammar

The syntax of the logical OR operator is as follows:

 <code class="c">expression || expression</code>

where expression is a boolean expression.

Example

The following example illustrates the use of logical OR operators:

 <code class="c">int a = 0; // 假int b = 1; // 真if (a || b) { // 条件为真，因为b 为真printf("a 或b 为真\n"); } else { // 条件为假，因为a 和b 都为假printf("a 和b 都为假\n"); }</code>

Output:

 <code>a 或b 为真</code>

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