5 Programs to Learn C++ OR (||) operator

What is C++ OR operator

OR is a logical operator in C++
The OR is denoted by || (two pipe signs)
The OR is used to evaluate two statements
If both statements are true, it returns 1 i.e. true
If one statement is true and the other is false, it returns 1 i.e. true
In case, both statements are false – it reruns 0 i.e. false
Unlike the AND operator (&&) that reruns false if any of the statement is false

A simple example of using OR (||) operator

In this example, we have two int type variables. We will check its equality with the || operator and display three results. See the C++ program below:

#include <iostream>

using namespace std;

int main() {

int a = 5;

int b = 10;

cout <<"Both True, Result: " <<(a == 5 || b == 10) <<"\n";

cout <<"One true and other false, Result: " <<(a != 5 || b == 10) <<"\n";

cout <<"Both false, Result: " <<(a != 5 || b != 10) <<"\n";

// 1

}

Output:

Using OR operator in if statement examples

The following short snippet of code in C++ shows using OR logical operator (||) in the if statement.

The three programs below show the result when:

both conditions are true
one condition is true and the other is false
both are false

Program 1

#include <iostream>

using namespace std;

int main() {

int x = 5;

int y = 10;

if ( (x <= 5 || y >= 10) )

{

cout << "True";

}

else

{

cout<<"False";

}

cout<<"\n\n";

}

Output:

True

As the value of x is less than or equal to 5 and the value of y is greater than or equal to 10, so both conditions are true and the output is True.

Program 2

#include <iostream>

using namespace std;

int main() {

int x = 5;

int y = 10;

if ( (x > 5 || y >= 10) )

{

cout << "True";

}

else

{

cout<<"False";

}

cout<<"\n\n";

}

Output:

True

As the value of x is not greater than 5, our first condition is false. However, the y value is greater than or equal to 10, so it’s true; so end result is true.

Program 3

#include <iostream>

using namespace std;

int main() {

int x = 5;

int y = 10;

if ( (x > 5 || y < 10) )

{

cout << "True";

}

else

{

cout<<"False";

}

cout<<"\n\n";

}

Output:

False

As neither value of x is greater than 5 nor the value of y is less than 10 – so both conditions are false. As a result, the else part executed that displayed “False”.

Using two OR operators examples

We are extending our above example to show you using the two OR operators in a single if statement.

For that, we have a third char-type variable with an initial value. It’s value is also checked in the if statement as follows:

#include <iostream>

using namespace std;

int main() {

int x = 5;

int y = 10;

char chr = 'y';

if ( (x > 5 || y < 10 || chr == 'y') )

{

cout << "True";

}

else

{

cout<<"False";

}

cout<<"\n\n";

}

Output:

True

Although, the x and y conditions are false, however, the chr value is ‘y’, so it is true. The end result is True.

What is C++ OR operator

A simple example of using OR (||) operator

Using OR operator in if statement examples

Using two OR operators examples

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