What does ! in c++ mean?

The ! operator in C is a logical NOT operator, used to negate a Boolean expression, turning its true value into a false value or a false value into a true value.

The ! Operator in C

What is the ! Operator?

! is the logical NOT operator in C, also known as the "logical negation" operator.

Function:

! The operator inverts a Boolean expression, that is, if the expression is true, it returns false; if the expression is false, then Return true.

Syntax:

! <boolean_expression>

Operation priority:

! The precedence of the operator is higher than arithmetic operators and lower than other logical operators.

Usage example:

bool is_true = true;
bool is_not_true = !is_true; // is_not_true 为假

Other notes:

• ! The operator can also be used with integers, But only if the integer is interpreted as a Boolean expression. For example, 0 is interpreted as false and non-zero integers are interpreted as true.
• Repeated use of the ! operator is equal to the original value, that is, !!x is equivalent to x.

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