C - Logical negation: !

The logical negation operator is used to determine the oposite value. in our case: if input is true then output is false, and if input is false the result is true. In next table you can find all possibilities:

a	x
False	True
True	False

information about the table: a is input, x is result

!

Description

! par1

Used keywords: !

Input

par1 - Logical value

Output

Result - Logical value

Examples

C

In the source code you can find the equivalent of the above table, for easier orientation at the end of each line is a comment which shows the result.

a1 = !0; // a1 = true
a2 = !1; // a2 = false

C

Even one example in what situations we can use the operation logical negation:

!a
!b && 1
!(10 >a || a<5)

C

Other pieces of example codes:

!a

You can find it in the following collections: logical operators

Logical negation in another programming language:

Differences to: