or how to type it in c language

The OR operator (||) in C language performs a logical OR operation on two Boolean expressions and returns a result in which at least one expression is true. It is used to calculate the logical OR value of conditional expressions, including scenarios such as condition satisfaction checking, Boolean expression combination, and condition simplification. The || operator has lower precedence than & (and operator), and expressions are evaluated in order from left to right.

The OR operator (||) in C language

The OR operator (|| ) is a logical operator that ORs the true or false values ​​of two Boolean expressions.

Definition and semantics

|| The operator takes two Boolean expressions as input and returns a Boolean value. The result of an operation is true if and only if at least one of the two expressions is true.

Expression evaluation order

|| The expression evaluation order of operators is from left to right. That is, it will evaluate the expression on the left first, and then the expression on the right.

Truth table

|| The truth table of the operator is as follows:

The expression on the left	Right side expression			Result
True	True	True
True	False	True
false	True	True
false	false	false

Application

|| operator is widely used to calculate the logical OR value of a conditional expression. Some common applications include:

• Checking whether one or more conditions are met
• Combining multiple Boolean expressions
• Simplifying complex conditions

Example

<code class="c">int age = 18;
int is_adult = age >= 18 || age >= 21; // is_adult 为真</code>

In this example, the || operator is used to determine whether the age variable represents an adult (18 years or 21 years and older) .

Note

• || operator has lower precedence than & (and operator).
• When using the || operator, consider the order of expression evaluation to ensure logical correctness.
• In complex conditions, it can be useful to use parentheses to control the order of operations.

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