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:

<code>condition ? value_if_true : value_if_false;</code>

where:

• condition is a Boolean expression that determines whether to select value_if_true or value_if_false.
• value_if_true is the value to be returned if condition is true.
• value_if_false is the value to return if condition is false.

How it works

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

• If condition is true, returns value_if_true.
• If condition is false, return value_if_false.

Example

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

<code class="c">int age = 18;
int canVote = (age >= 18) ? 1 : 0;</code>

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

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