Develop a NUMBER GUESSING GAME using flag-controlled while loop in Java

Develop a NUMBER GUESSING GAME using flag-controlled while loop in Java Hi and welcome back to this channel, Let’s continue our discussion on while loop structures In today’s video, I am going to show you how to develop a Number Guessing Game, using a flag-controlled while loop. The game that we will develop must be able to prompt the user to guess the number that will be randomly generated by the program But before that, let’s talk briefly about flag-controlled while loop Actually, a flag-controlled while loop is a loop that uses a boolean variable to control the execution of the loop The boolean variable is then called in programming terms, a flag variable The code on the screen is a perfect example of how a flag-controlled while loop statement looks like int score = 0; boolean isFound = false; while ( !isFound ) { System.out.println (score + “ “); Score = score + 10; if (score greater than or equal to 100) isFound = true; } What we can note in this code is that the loop control variable is a boolean variable And as I said, that boolean variable is what we call a flag variable The loop condition will test the flag variable If the loop condition is met Then the action statements in the body of the loop will execute In the body of the loop, there is an if statement that is being used to update the loop control variable whenever the condition in the if statement evaluates to true Let’s run this program and see what happens Now, let’s develop our Number Guessing Game As I said at the beginning Suppose that we want to have a game that randomly generates an integer number greater than 0 and less than 100. The game must then prompt the user to guess the randomly generated number. If the user guesses the number correctly, then the program will print out a specific message If the number guessed by the user is not correct then the program checks to see if the number guessed is greater or less than the random number If the guessed number is less than the random number, the program will print out a message saying that “The number you guessed by the user is less than the random number” In case the number guessed by the user is greater than the random number, the program will have to print out a message saying that “The number you guessed by the user is greater than the random number” The user will be prompted to guess the random number over and over again until he enters the correct number So here is how the code will look like I will start by creating an input object since I am going to use the keyboard as the source of input import java.util.*; public class FlagControlledLoop { static Scanner console = new Scanner(System.in); public static void main(String[] args) { The next thing to do is to declare the various variables that I will use in this program The first variable will be the one used to store the number guessed by the user int guessed_number; The second variable will store the random number generated by the program int random_number; Next, I need to initialize this variable random_number Since we said that we want the program to randomly generate the number That’s the reason I am going to use a predefined Java method called the random method The random method is part of the Math class random_number = (int) (Math.random() * 100); Note that I am also putting the (int) in front of the method to make sure that the statement will return an integer value Next, I need to declare the loop control variable before writing the while loop statement As I mentioned at the beginning In this program particularly, we are going to use a flag-controlled while loop So, the loop control variable must be of type boolean boolean flag_variable = false; Let’s now write the while loop statement while (!flag_variable) { The first action statement must prompt the user to enter a number System.out.print ("Enter an integer greater than or equal to 0 and less than 100") Next, I will write the input statement guessed_number = console.nextInt(); After that, I will write an if … else statement to update the flag variable in case a certain condition is met if (guessed_number == random_number) { System.out.println("Congratulations ! You guessed the correct number."); Next, update the value of the flag variable flag_variable = true; } I will now add an else … if statement here else if (guessed_number less than random_number) { System.out.println("The number you guessed is less than the random number"); System.out.println("Guess again. Please !!!!!"); } Then, write an else statement else { System.out.println("The number you guessed is greater than the random number"); System.out.println("Guess again. Please !!!!!"); } } } Once everything is set up correctly You can now run your program and see what happens Thanks for viewing, I hope this video was informative. Please do not forget to like and SUBSCRIBE to this channel. Let’s meet in another video. #codingriver #javatutorial #learnjava

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