What does ?: mean in c language?

The conditional operator (?:) is used to determine the value of a variable and returns different values according to the Boolean expression condition: value_if_true is returned when the condition is true, and value_if_false is returned when it is false.

The meaning of ?: in C language

In C language, ?: is called a conditional operator, It is a ternary operator used to determine the value of a variable under specific conditions.

Syntax

?: The syntax of the operator is as follows:

condition ? value_if_true : value_if_false;

where:

• conditionis a Boolean expression that determines whether to selectvalue_if_trueorvalue_if_false.
• value_if_trueis the value to be returned ifconditionis true.
• value_if_falseis the value to return ifconditionis false.

How it works

?: The operator evaluates theconditionexpression and performs the following actions based on its result:

• Ifconditionis true, returnsvalue_if_true.
• Ifconditionis false, returnvalue_if_false.

Example

The following example demonstrates how to use the ?: operator:

int age = 18; int canVote = (age >= 18) ? 1 : 0;

In this example,conditionisage >= 18, it checks whetherageis greater than or equal to 18. If true,canVoteis set to 1 (indicating that voting is possible). If false,canVoteis set to 0 (indicating that votes cannot be cast).

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