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Number guessing game in Java

  • Difficulty Level : Medium
  • Last Updated : 05 Oct, 2021

The task is to write a Java program in which a user will get K trials to guess a randomly generated number. Below are the rules of the game:

  • If the guessed number is bigger than the actual number, the program will respond with the message that the guessed number is higher than the actual number.
  • If the guessed number is smaller than the actual number, the program will respond with the message that the guessed number is lower than the actual number.
  • If the guessed number is equal to the actual number or if the K trials are exhausted, the program will end with a suitable message.

Approach: Below are the steps:  

  • The approach is to generate a random number using Math.random() method in Java.
  • Now using a loop, take K input from the user and for each input print whether the number is smaller or larger than the actual number.
  • If within K trials the user guessed the number correctly, print that the user won.
  • Else print that he was not able to guess and then print the actual number.

Below is the implementation of the above approach: 

Java




// Java program for the above approach
import java.util.Scanner;
 
public class GFG {
 
    // Function that implements the
    // number guessing game
    public static void
    guessingNumberGame()
    {
        // Scanner Class
        Scanner sc = new Scanner(System.in);
 
        // Generate the numbers
        int number = 1 + (int)(100
                               * Math.random());
 
        // Given K trials
        int K = 5;
 
        int i, guess;
 
        System.out.println(
            "A number is chosen"
            + " between 1 to 100."
            + "Guess the number"
            + " within 5 trials.");
 
        // Iterate over K Trials
        for (i = 0; i < K; i++) {
 
            System.out.println(
                "Guess the number:");
 
            // Take input for guessing
            guess = sc.nextInt();
 
            // If the number is guessed
            if (number == guess) {
                System.out.println(
                    "Congratulations!"
                    + " You guessed the number.");
                break;
            }
            else if (number > guess
                     && i != K - 1) {
                System.out.println(
                    "The number is "
                    + "greater than " + guess);
            }
            else if (number < guess
                     && i != K - 1) {
                System.out.println(
                    "The number is"
                    + " less than " + guess);
            }
        }
 
        if (i == K) {
            System.out.println(
                "You have exhausted"
                + " K trials.");
 
            System.out.println(
                "The number was " + number);
        }
    }
 
    // Driver Code
    public static void
    main(String arg[])
    {
 
        // Function Call
        guessingNumberGame();
    }
}

Output: 

Below is the output of the above program: 

 


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