Logical Operators

Logical operator:-  C language support three logical operators – logical AND(&&), logical OR( || ),  and logical NOT (!).

Operator	Description	Example
&&	Called Logical AND operator. If both the operands are non-zero, then condition becomes true.	(A && B) is false.
||	Called Logical OR Operator. If any of the two operands is non-zero, then condition becomes true.	(A || B) is true.
!	Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.	!(A && B) is true.

Note: - When expression is true, operator returns the value=1

                When expression is false, operator returns the value=0

Truth table for logical AND

A	B	A&&B
0	0	0
0	1	0
1	0	0
1	1	1

                                    For example :-   (a<b)&&(a>b)

Truth table Logical OR

A	B	A||B
0	0	0
0	1	1
1	0	1
1	1	1

Logical NOT (!):- it takes the single expression and negates the value of expression.

Truth table:-

A	!A
0	1
1	0

 For example,    int a =12,b;

                                b=!a;

therefore, the value of b= -12