C++ Logical Operators

In this tutorial, you will learn about different Logical Operators available in C++ programming language and go through each of these Logical Operators with examples.

C++ Logical Operators

Logical Operators are used to perform boolean operations like AND, OR, and NOT.

Operators

The following table specifies symbol, example, and description for each of the Logical Operator in C++.

Operator Symbol	Logical Operation	Example	Description
&&	AND	a && b	Returns boolean AND of a and b.
||	OR	a && b	Returns boolean OR of a and b.
!	NOT	!a	Returns Negation or boolean NOT of a.

1. Logical AND (&&)

The following is the truth table for AND operation.

Operand 1	Operand 2	Returns
true	true	true
true	false	false
false	true	false
false	false	false

main.cpp

#include <iostream>
using namespace std;

int main() {
   int a = 10;

   if ((a < 100) && (a%2 == 0)) {
      cout << "a is even and less than 100." << endl;
   }
}

Output

a is even and less than 100.

2. Logical OR (||)

The following is truth table for OR operation.

Operand 1	Operand 2	Returns
true	true	true
true	false	true
false	true	true
false	false	false

main.cpp

#include <iostream>
using namespace std;

int main() {
   int a = 7;

   if ((a < 10) || (a%2 == 0)) {
      cout << "a is even or less than 10." << endl;
   }
}

Output

a is even or less than 10.

3. Logical NOT (!)

The following is truth table for NOT operation.

Operand	Returns
true	false
false	true

main.cpp

#include <iostream>
using namespace std;

int main() {
   int a = 7;

   if (!(a%2 == 0)) {
      cout << "a is not even." << endl;
   }
}

Output

a is not even.

Conclusion

In this C++ Tutorial, we have learned what Logical operators are, which logical operators are available in C++, and how to use them, with the help of examples programs.