Chapter 4.5, Problem 4.19CP

Explanation of Solution

Flag:

In programming language, a flag is a variable, which is of Boolean type that rises when a condition occurs.

• Generally, Boolean variables are used as flags.
• A flag is a variable which is used to remember something or leaves a sign for the other parts of the program.
• The condition does not exist when the flag is set to “false”.
• The condition exists when the flag is set to “true”.
• In addition with the “int”, “float” and “string” data type, C# also provides a “bool” data type which holds one of the two values “True” or “False”.

Example Program:

//Include libraries

using System;

//Declare the namespace

namespace ConsoleApp2

{

  //Define the class name

        class Program

        {

    //Define the Main() function

            static void Main(string[] args)

            {

                //Declare and assign the variables

                int number = 6;

                bool flag_val;

                //Check to check the number is odd or even

                if (number % 2 == 0)

                    //set flag variable as True

                    flag_val = true;

                // If condition fails else part is executed

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