What does ‖ mean in C language?

The "||" operator in C language performs logical OR operation and is used to check whether at least one of two Boolean expressions is true. It performs short-circuit evaluation from left to right. If the first expression If the formula is true, it returns true directly.

The meaning of "||" in C language

In C language, the "||" operator is a logical OR operator that performs a logical OR operation on two Boolean expressions. This operator has lower precedence than the logical AND operator "&&" and higher precedence than the arithmetic and relational operators.

Logical OR operation

The logical OR operation uses short-circuit evaluation, which means that it evaluates the expression sequentially from left to right. If the first expression is true, the result is true and the second expression is not evaluated. The second expression is evaluated only if the first expression is false.

Syntax and return value

The syntax of the "||" operator is as follows:

<code>result = expression1 || expression2;</code>

Where:

• result is the result, which is a boolean value (true or false).
• expression1 and expression2 are two Boolean expressions to be logically ORed.

Result table

The following table shows all possible input and output values:

## TrueTrueTrueTrueFalseTrue##False##falsefalsefalseExample

expression1	expression2	result
True	True

int x = 10;
int y = 5;

if (x > 0 || y > 0) {
  printf("x 和 y 至少有一个大于 0\n");
}

In this example, the "||" operator is used to check whether x

or

y is greater than 0. If any of these are true, then the condition of the if statement is true and the block of code will be executed. Application

The "||" operator is often used in C language to:

Check whether multiple conditions are true.

Determine whether any of two or more Boolean expressions is true.
• Construct complex logical expressions.

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