3 digit lottery case

[Lovro Bajc]

Hi everyone,

I have got a task to make the lottery system where user is asked input three digit integer if he wants to guess the randomly generated numbers.
Currently I am at the barrier in the whole evaluation system. Got the first part right where exact order needs to be checked for the main price, however
the next two awards are pain in the a** ; Could you please help me out with the idea behind comparing the digits for this specific grading system?

thank you very much

Problem:

	/* if all the digits match price is 3000$ */
 	
	}else if ( ?? )	
		
	/* if one digit matches the lottery number the award is 1000$ */

Code:

import java.util.Scanner;


public class LotteryV2 {
	public static void main (String [] args){

	//Generate random number with 3 diggits
	int lottery = 100 + (int)(Math.random() * ((999 - 100)+1)); 
	//Start scanner
	Scanner input = new Scanner (System.in);
	//Prompt user to enter three digits
	System.out.println(" Enter the three digit integer");
	int user = input.nextInt();
	
	int u1 = user /100;
	int remainU = user % 100;
	
	int u2 = remainU /10;
	int u3= remainU % 10;


	//Get  3 digits from lottery
	
	int d1 = lottery /100;
	int remainN = lottery % 100;
	
	int d2 = remainN /10;
	int d3= remainN % 10;

	System.out.println(" The lottery numbers are " + d1 + " " + d2 + " " + d3 + "!");
	
	//**Check the guess and print out the award system.
	/* if users input matches the lottery input in exact order price is 10000$*/
	 	
	if ((u1 == d1) && (u2 == d2) && (u3 == d3)){
		System.out.println("You have won 10000 €. Perfect match!");

	/* if all the digits match price is 3000$ */
 	
	}else if ( )	
		
	/* if one digit matches the lottery number the award is 1000$ */
	 
	}
}

[Greg Hatt]

I'm not sure if this is for a class or if you're learning on your own but one thing you might want to look into are collections/arrays. If this is for a class then you'll be covering arrays and loops in the near future (I assume) and are expected to answer this problem without the use of either loops or arrays?

You could just check each value against each other value and keep a track of how many matches you accumulate.

User Numbers = A B C
Lottery Numbers = D E F

The '||' is the "Or" operator. So the below statements say: "Increment the count of matches If A equals D OR A equals E OR A equals F".

If (A == D || A == E || A == F) { matchCount++};
If (B == D || B == E || B == F) { matchCount++};
if (C == D || C == E || C == F) { matchCount++};

Then you'll know how many matches you have. I think that makes sense.

[Joanne Neal]

Greg Hatt wrote:The '||' is the "Or" operator. So the below statements say: "Increment the count of matches If A equals D OR A equals E OR A equals F".

If (A == D || A == E || A == F) { matchCount++};
If (B == D || B == E || B == F) { matchCount++};
if (C == D || C == E || C == F) { matchCount++};

Then you'll know how many matches you have. I think that makes sense.

The only problem with that is that there is no validation that all the entered numbers are different (or even that all the lottery numbers are different).
If the lottery numbers were 1, 2 and 3 and the user entered 333, then they would win.

[Greg Hatt]

True. I just sort of assumed that the lottery numbers themselves would have to be unique and the user's guess would have to be unique as well but after looking at the code I see it's not a business rule of this particular application.

Sorry for misleading OP. Keeping with above theme, or not using arrays or loops and if all numbers can be the same then you'll end up writing conditional statements for every possible combination of matches.

[Swaraj Pal]

Hey all,
You can try this approach for better work,

Instead of working with integers its better to work with Strings for this type of iterative work,

public static void main(String[] args) throws ParseException
{
  
        //Generate random number with 3 diggits  
    int lottery = 100 + (int)(Math.random() * ((999 - 100)+1));   
    //Start scanner  
    Scanner input = new Scanner (System.in);  
    //Prompt user to enter three digits  
    System.out.println(" Enter the three digit integer");  
    int user = input.nextInt();  
      
 
    System.out.println("Lottery Digits are "+lottery);
    String lottString=""+lottery;
    String userString=""+user;
    System.out.println(lottString);
    
    int counter=0;
    
    for(int i=0;i<3;i++)
    {
        if(lottString.charAt(i)==userString.charAt(i))
        {
            counter++;
        }
    }
    
    System.out.println("Matched numbers:  "+counter);
    
    switch(counter)
    {
        case 1:
            System.out.println("You won $1000");
            break;
        case 3:
            System.out.println("You won $3000");
            break;
        case 0:
        case 2:
            System.out.println("Try again");
    }
}

Reply if it helps

[Joanne Neal]

Greg Hatt wrote:Sorry for misleading OP.

I don't think you were misleading him. You pointed him/her in the right direction which is what this forum is all about. I was just adding some extra directions for when he got to the point you had directed him to

[Lovro Bajc]

I'm not sure if this is for a class or if you're learning on your own but one thing you might want to look into are collections/arrays. If this is for a class then you'll be covering arrays and loops
in the near future (I assume) and are expected to answer this problem without the use of either loops or arrays?

I am going through the book on my own, and as far as my understanding goes, arrays and loops are coming up shortly It is just an exercise in the book Introduction to Java Programming Comprehensive Version 10th edition. under section 3 (boolean, if, switch) .

But before to do it with collections/arrays I need to improvise i guess so now what I have come up with is bellow, and I think it should work (At least when I was testing few numbers). I also changed the major price to a shorter version :

import java.util.Scanner;


public class LotteryV2 {
	public static void main (String [] args){

	//Generate random number with 3 diggits
	int randomNumber = 100 + (int)(Math.random() * ((999 - 100)+1)); 
	//Start scanner
	Scanner input = new Scanner (System.in);
	//Prompt user to enter three digits
	System.out.println(" Enter the three digit integer");
	int userNumber = input.nextInt();
	
	int u1 = userNumber /100;
	int remainU = userNumber % 100;
	
	int u2 = remainU /10;
	int u3= remainU % 10;


	//Get  3 digits from lottery
	
	int d1 = randomNumber /100;
	int remainN = randomNumber % 100;
	
	int d2 = remainN /10;
	int d3= remainN % 10;

	System.out.println(" The lottery numbers are " + d1 + " " + d2 + " " + d3 + "!");
	
	//**Check the guess and print out the award system.
	/* if users input matches the lottery input in exact order price is 10000$*/
	 	
	if (userNumber == randomNumber ){
		System.out.println("You have won 10000 €. Perfect match!");

	/* if all the digits match price is 3000$ */
 	
	}else if (((u1 == d1) || (u1 == d2) || (u1 == d3)) && 
			((u2 == d1) || (u2 == d2) || (u2 == d3)) &&
			((u3 == d1) || (u3 == d2) || (u3 == d3))){	
		System.out.println("All numbers are correcnt! You have won 3000 €.");
		
		/* if at least one digit matches the lottery number the award is 1000$ */
		
	}else if (((u1 == d1) || (u1 == d2) || (u1 == d3)) || 
			((u2 == d1) || (u2 == d2) || (u2 == d3)) ||
			((u3 == d1) || (u3 == d2) || (u3 == d3))){
		System.out.println("At least one number is correct. You win 1000 €");
	}else 
		System.out.println ("No match");
  }
}

thanks for all the help