How to ask 5 different numbers and then answer it?

Question

import java.util.*;

public class Testing {

    public static void main(String[] args) {

        Random rand = new Random();
        int random = (int)(Math.random() * 3 + 1);

        //to see what number to guess
        System.out.println(random);

        int score = 0;
        Scanner input = new Scanner(System.in);
        System.out.print("Enter Number: ");
        String num = input.nextLine();
        int count = 0;

        while (count <= 5) {
            if (random == 1) {
                if (num.equals("one")) {
                    System.out.println("correct");
                    score++;
                }
                else {
                    System.out.print("Wrong!");
                }
            }
            else if (random == 2) {
                if (num.equals("two")) {
                    System.out.println("correct");
                    score++;
                }
                else {

                    System.out.print("Wrong!");
                }
            }
            else {
                if (num.equals("three")) {
                    System.out.println("correct");
                    score++;
                }
                else {
                    System.out.print("Wrong!");
                }
            }
            count++;
        }
        System.out.println(score);
    }
}

How do I make it that will ask 5 different random numbers ?.

After every good guess, the score should be incremented by 1.

After every guess (good or bad), it should proceed to another random number?

you need an array for the 5 numbers, which must be generated in a range between a and b, then compare the input — ΦXocę 웃 Пepeúpa ツ, Mar 17 '17 at 15:16

score 0 · Answer 1 · answered Mar 17 '17 at 15:36

To Read 5 numbers from the user, write a code something like below

public Integer [] read5NumbersFromConsole(Scanner input){
    Integer [] inputNumber = new Integer [5];   
  for(int i =0; i< 5; i++){
     System.out.print("Enter Number: ");
        inputNumber[i] = input.nextInt();

   }
return inputNumber;
}

The rest I left it for you to implement...

score 0 · Accepted Answer · edited May 23 '17 at 12:09

Strange that you allocate a Random class to not use it.

You should use it, and write rand.nextInt(3 + 1) (exclusive, thus the +1) rather than (int)(Math.random() * 3 + 1).

Your while loop can be simplified by a for loop: for (int count = 0; count < 5; ++count). Beware, initializing your variable to 0 and going to <= 5 will result to 6 iterations, not 5.

You do not need to create an array of 5 numbers in your case, you can simply generate a new random number for each guess, inside your loop.

You could also reduce redundancy in your code with a map like 1 to "one", 2 to "two", etc.

In the end, I would write it like this:

import java.util.HashMap;
import java.util.Random;
import java.util.Scanner;

public class Testing {

    public static void main(String[] args) {
        int score = 0;
        Random rand = new Random();
        Scanner input = new Scanner(System.in);

        HashMap<Integer, String> intToString = new HashMap<>();

        intToString.put(1, "one");
        intToString.put(2, "two");
        intToString.put(3, "three");

        for (int count = 0; count < 5; ++count) {
            // "nextInt" is exclusive! Doing +1 converts [0;2] to [1;3]
            int random = rand.nextInt(3 + 1);

            // To see what number to guess
            System.out.println(random);

            String num = input.nextLine();

            // Get the string representation
            String response = intToString.get(random);

            if (num.equals(response)) {
                System.out.println("correct");
                ++score;
            } else {
                System.out.println("Wrong!");
            }
        }

        System.out.println(score);
    }
}

If you are using Java 1.7+, you can use ThreadLocalRandom.current() rather than Random. Related post here.

How to ask 5 different numbers and then answer it?

2 Answers2