What does ! mean in c language?

In C language, the exclamation point (!) represents the logical NOT operator, which is used to negate an expression so that its result is the opposite of the original expression.

What does ! mean in C language?

In C language, the exclamation point (!) represents the logical NOT operator, which negates an expression. That is, if the expression is true, the result is false; if the expression is false, the result is true.

Usage:

!expression;

Among them, expression is the expression to be negated.

Example:

int x = 10;
if (!x) {
  // x 为 0 时执行
}

In this example, !x is equal to false because x is non-zero value. Therefore, the if statement will not be executed.

Priority:

The logical NOT operator has higher priority than the logical AND and OR operators, but lower than the arithmetic operator.

Application scenarios:

The logical NOT operator is usually used in the following scenarios:

• Invert the Boolean value
• Detect whether the condition is not true
• Construct a more complex Boolean expression

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