What do two vertical lines in C language mean?

In C, the double vertical (||) operator is used for logical OR operations, evaluating two Boolean expressions to a Boolean: if the first expression is true, the result is true. If the first expression is false, the second expression is evaluated, if the second expression is true, the result is true, otherwise it is false.

Double vertical lines in C language (||)

In C, the double vertical (||) operator is used for logical "OR" operations. This operator performs logical "OR" operations on two Boolean expressions, and the result is a Boolean value.

grammar

 <code class="c"><result> = <expression1> || <expression2>;</expression2></expression1></result></code>

in:

• <result></result> is the result variable.
• <expression1></expression1> and <expression2></expression2> are boolean expressions.

Evaluation

The double vertical line operator is evaluated according to the following rules:

• If <expression1></expression1> is true, then <result></result> is true, and there is no requirement value <expression2></expression2> .
• If <expression1></expression1> is false, then <expression2></expression2> is evaluated, if <expression2></expression2> is true, then <result></result> is true, otherwise it is false.

Example

 <code class="c">int x = 5; int y = 10; int result = (x > 3) || (y </code>

In this case, (x > 3) is true, so (y has no required value and the value of <code>result is true.

application

Double vertical line operators are commonly used for:

• Check whether multiple conditions are true.
• Create more flexible conditions in conditional statements.
• Implement the function of the logical "OR" gate.

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