What do two vertical bars mean in C language

In C language, two vertical bars (||) represent logic or operators, concatenate two Boolean expressions and return a Boolean value: if both expressions are true, return true. If one of the expressions is true and the other is false, then true is returned. False is returned only if both expressions are false.

Two vertical bars in C language (||)

In C language, two vertical bars (||) represent logic or operators. It concatenates two boolean expressions and returns a boolean value.

Operation rules:

• If both expressions are true, then true is returned.
• If one of the expressions is true and the other is false, then true is returned.
• False is returned only if both expressions are false.

Usage example:

 <code class="c">int main() { int x = 10, y = 5; if (x > 5 || y </code>

In this example:

• x > 5 and y are both true, so the condition is true.
• x > 10 || y is false because <code>x > 10 is false and y is also false.

Priority:

The logical or operator has lower priority than other arithmetic operators, such as addition and multiplication. Therefore, before performing logical operations, arithmetic operations are performed first.

Application scenarios:

Logical or operators can be used for:

• Check whether at least one of the multiple conditions is true.
• Combine multiple boolean expressions into one complex condition.
• Simplify conditional statements.

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