C Programming - Operators - Logical Operators

Logical operators are used to perform logical operations on the given two variables.
Logical operators :
Operator
Usage
&&
expr1 && expr2
||
expr1 || expr2
!
!expr1
Logical operator chart :
Operator
Condition 1
Condition 2
Result




&&
True
True
True

True
False
False

False
True
False

False
False
False




||
True
True
True

True
False
True

False
True
True

False
False
False




!
True
-
False

False
-
True
Example :

a = 5;
b = 10;

(a == 5) && (b < 5) = false
/*
    here, first expression a == 5 is true
          second expression b < 5 is false
    so, final result of && operator is false
    (True && False = False)
*/

(a == 4) && (b < 15) = false
(a == 5) && (b < 15) = true
(a == 4) && (b < 5) = false

(a == 5) || (b < 5) = true
(a == 4) || (b < 15) = true
(a == 4) || (b < 5) = false

!(a == 5) = false
!(a == 4) = true