Logical Operators in C++

Explanation

The logical operators are used to logically combine, compare Boolean conditions or expressions. The following table lists the operators. Operator Action ! NOT && AND || OR

                                                                                   

 Details:

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.

Logical AND

Example:

#include <iostream>

using namespace std;

int main()

{

cout << "Enter a number: ";

int nValue;

cin >> nValue;

if (nValue > 10 && nValue < 20)

cout << "Your value is between 10 and 20" << endl;

else

cout << "You value is not between 10 and 20" << endl;

return 0;

}

Logical OR

Example:

#include <iostream>

int main()

{

using namespace std;

cout << "Enter a number: ";

int nValue;

cin >> nValue;

if (nValue == 0 || nValue == 1)

cout << "You picked 0 or 1" << endl;

else

cout << "You did not pick 0 or 1" << endl;

return 0;

}

Logical NOT

Example:

int x = 5;

int y = 7;

if (!(x == y))

cout << "x does not equal y";

else

cout << "x equals y";

Another Example:

#include <iostream>

using namespace std;

int main ()

{

int a =5;

int b =20;

if( a && b )

{

cout <<"Line 1 - Condition is true"<< endl ;

}

if( a || b )

{

cout <<"Line 2 - Condition is true"<< endl ;

}

/* Let's change the values of a and b */

a =0;

b =10;

if( a && b )

{

cout <<"Line 3 - Condition is true"<< endl ;

}

else

{

cout <<"Line 4 - Condition is not true"<< endl ;

}

if(!(a && b))

{

cout <<"Line 5 - Condition is true"<< endl ;

}

return 0;

}

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