Dart Logical Operators

Logical operators are the operators that combine two or more conditions, and accordingly return a Boolean value : true or false.

Assume the value of variable A is 25 and B is 40.

Operator	Description	Example
&&	And - The operator returns true if and only if all the expressions return true.	(A < 10 && B > 10) is False.
||	OR - The operator returns true if at least one of the expressions return true.	(A > 10 || B > 10) is True.
!	NOT - The operator returns the inverse of the expression’s result. For E.g.: !(17 > 5) returns false	!(A < 10) is True.

AND and OR Operators ( && and || )

The && operator returns true if and only if both the conditions return true. If either of them is false, the result is also false.

The || operator returns true if any one of the expressions returns true. It returns false if and only if both conditions are false.

X	Y	X && Y	X || Y	!X
0	0	0	0	1
0	1	0	1	1
1	0	0	1	0
1	1	1	1	0

Program

Consider the following code in Dart that explains logical operator,

void main( )
{
    int a = 25 ;
    int b = 15 ;
 
    // Using And Operator ( && )
    // where both conditions are true
    bool c = a > 10 && b > 10 ;
    print( c ) ;


     // Using And Operator ( && )
    // where both conditions are false
    bool d = a > 50 && b < 10 ;
    print( d ) ;
  
    // Using Or Operator ( || )
    // where only one condition is true
    bool e = a > 10 || b < 10 ;
    print( e ) ;
  
    // Using Or Operator ( || )
    // where both conditions are false
    bool f = a > 50 || b < 10 ;
    print( f ) ;  
 
    // Using Not Operator ( ! )
    bool g = !( a > 10 ) ;
    print( g ) ;
}

Output

 true
 false
 true
 false
 false