The Negation Operator in Programming Languages

The Negation Operator in Programming

There is another logical operator that is called logical negation. The sign ! is used for

this operator. This operand enables a programmer to ‘reverse’ the meaning of a

condition. This is a unary operator that has only a single condition as an operand. The

operator ! is placed before a condition. If the original condition (without the !

operator) is false then the ! operator before it converts it to true and the statements

attached to this are executed.

Look at the following expression

if ( ! (age > 18 ))

cout << “ The age is less than 18”;

Here the cout statement will be executed if the original condition (age > 18) is false

because the ! operator before it reverses this false to true.

The truth table for the logical negation operator ( ! ) is given below.

Expression	!Expression
True	False
False	True

negation operator in perl, negation operator in vba, negation operator in php,  negation operator python, negation operator in javascript, negation operator java