bool Keyword in C#

Last Updated : 22 Jun, 2020

Keywords are the words in a language that are used for some internal process or represent some predefined actions. bool is a keyword that is used to declare a variable which can store Boolean values true or false. It is an alias of System.Boolean.

Bool Keyword occupies 1 byte (8 bits) in the memory. There are only two possible values of bool i.e. true or false.

Syntax:

bool variable_name = value;

Example:

Input: true

Output: answer: False
        Size of a byte variable: 1

Input: false

Output: Type of answer: System.Boolean
        answer: True
        Size of a bool variable: 1

Example 1:

// C# program for bool keyword
using System;
using System.Text;
   
    class GFG
    {
        static void Main(string[] args)
        { 
            // bool variable declaration
            bool answer = false;
   
            // to print value
            Console.WriteLine("answer: " + answer);
  
            // to print size of a bool 
            Console.WriteLine("Size of a bool variable: " + sizeof(bool));
   
        }
    }

Output:

answer: False
Size of a bool variable: 1

Example 2:

// C# program for bool keyword
using System;
using System.Text;
  
namespace geeks {
  
class GFG {
  
    static void Main(string[] args)
    {
        // bool variable declaration
        bool answer = true;
  
        // to print type of variable
        Console.WriteLine("Type of answer: " + answer.GetType());
  
        // to print value
        Console.WriteLine("answer: " + answer);
  
        // to print size of a bool
        Console.WriteLine("Size of a bool variable: " + sizeof(bool));
  
        // hit ENTER to exit
        Console.ReadLine();
    }
}
}

Output:

Type of answer: System.Boolean
answer: True
Size of a bool variable: 1

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