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Table of Contents

Boolean Variable in C++ Programming

In this lesson, we will understand what is Boolean Variable and how to declare it in C++ programming, with the help of some examples. We will also play a quiz at the end.

What is Boolean Variable

In C++ program a boolean variable can store value either 1 or 0. To declare a variable of type boolean we use the keyword bool.

Video Explanation

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Syntax of Declaring Boolean Variable in C++

bool variable_name;

Here bool is used for declaring Boolean data type and variable_name is the name of variable (you can use any name of your choice for example: a, b, c, alpha, etc.) and ; is used for line terminator (end of line).

Now let's see some examples for more understanding.

Example 1

Declare a boolean variable x.

bool x;

Example 2

Declare 3 boolean variables x, y, and z to assign the values 1, 0 and 1 respectively.

bool x=1, y=0, z=1;

Example 3

Declare a boolean variable x and assign the value 0 and change it value to 1 in the next line.

bool x = 0;
x = 1; 	 //now the new value of x is 1

Test Your Knowledge

Attempt the questions in the exercise to check whether you have understood the lesson clearly.

Exercise

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