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Thread: Lotto Problem logic error

  1. #1
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    Default Lotto Problem logic error

    Here is my code. It runs, but the output is not what I wanted. This project allows the user to enter up to 6 lottery tickets and I have to generate random numbers 0-49. The number generate fine, but the number of tickets entered doesn't. If i enter two tickets, It'll still print out six. It should print out the number of tickets based on user input. Please help. Thank you










    import java.util.Collections;
    import java.util.ArrayList;
    import java.util.Scanner;

    public class LotteryTest {
    public static void main(String[] args){
    Scanner input = new Scanner(System.in);
    {

    ArrayList<Integer> numbers = new ArrayList<Integer>();

    System.out.println("Please enter the number of tickets you want");
    int numtix = input.nextInt();

    for(int i = 0; i <= 49; i++){ //loop to choose
    numbers.add(i+0);
    }
    for (int i=0; i<6; i++) { //loop for # of lottery tickets
    Collections.shuffle(numbers); //randomly shuffle elements of arraylist
    System.out.print("\nLotto Ticket #"+(numtix)+": ");

    for (int j=0; j<6; j++) { // determine how many numbers for each ticket
    System.out.print(numbers.get(j) + " ");
    }
    }
    }
    }
    }


  2. #2
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    Default Re: Lotto Problem logic error

    hi

    your fault is int the loop "for (int i=0; i<6; i++) { //loop for # of lottery tickets"

    here you say that you want to make a loop 6 times but what if the user want only 2 tickts?

    cause of that you got the parameter numtix so why you dont use it??
    so try this "for (int i=0; i<numtix; i++){ //loop for # of lottery tickets "

    and change "System.out.print("\nLotto Ticket #"+(numtix)+": ");" to "System.out.print("\nLotto Ticket #"+(i+1)+": ");"

    hope i was helpfull

  3. #3
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    Default Re: Lotto Problem logic error

    thanks, but while waiting for a reply i realized that was the problem as well. and ended up with this code. Everything works fine now, but what method can I use to make sure the output of numbers is in numerical order?

    import java.util.*;
    public class LotteryTest {
    public static void main(String[] args){
    Scanner input = new Scanner(System.in);
    {

    ArrayList<Integer> numbers = new ArrayList<Integer>();

    System.out.println("How many tickets would you like? You may choose up to 6.");
    int numtix = 0;

    while (true){ //loop for user entering number of tickets
    numtix = input.nextInt();
    if (numtix <= 6 && numtix >= 0){
    break;
    }
    }


    for(int i = 0; i <= 49; i++){ //loop for range of numbers
    numbers.add(i);
    }
    for (int i=0; i<numtix; i++) { //loop for printing # of lottery tickets
    Collections.shuffle(numbers); //randomly shuffle elements of arraylist
    System.out.print("\nLotto Ticket : ");

    for (int j=0; j<6; j++) { // determine how many numbers for each ticket
    System.out.print(numbers.get(j) + " ");
    }
    }
    }
    }
    }

  4. #4
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    Default Re: Lotto Problem logic error

    try this:


    import java.util.*;
    public class LotteryTest {
    public static void main(String[] args){
    Scanner input = new Scanner(System.in);
    {

    ArrayList<Integer> numbers = new ArrayList<Integer>();

    System.out.println("How many tickets would you like? You may choose up to 6.");
    int numtix = 0;

    while (true){ //loop for user entering number of tickets
    numtix = input.nextInt();
    if (numtix <= 6 && numtix >= 0){
    break;
    }
    }


    for(int i = 0; i <= 49; i++){ //loop for range of numbers
    numbers.add(i);
    }
    for (int i=0; i<numtix; i++) { //loop for printing # of lottery tickets
    Collections.shuffle(numbers); //randomly shuffle elements of arraylist
    System.out.print("\nLotto Ticket "+(i+1)+ ": ");

    for (int j=0; j<6; j++) { // determine how many numbers for each ticket
    System.out.print(numbers.get(j) + " ");
    }
    }
    }
    }
    }

  5. #5
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    Default Re: Lotto Problem logic error

    okay it worked. Thanks a bunch. My teacher said for an extra challenge we could try to rewrite this program only using arrays and no arraylists and a 2 dimensional array must be used to store the ticket. What would i change? I'm not familiar with 2d arrays. thanks a lot

  6. #6
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    Default Re: Lotto Problem logic error

    you should define array like this,
    lotteryarray[numtix][6]
    and insert the numbers in it.
    so if the user want 3 tickts the array will be 3*6 the number of the columns is the number of the tickts and the number of the rows is the 6 numbers

  7. #7
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    Default Re: Lotto Problem logic error

    To quote Copeg (This is for you ridg18):

    I highly recommend reading the forum rules and the following:

    The Problem with Spoon-feeding

    There is a high chance you just contributed to academic dishonesty...nice going.
    ippo, here are a few resources on Multi-dimensional arrays:
    Multi-dimensional arrays in Java
    Java Multi Dimensions Array - Java Tutorials
    Java program to demonstrate multidimensional arrays : ArrayCollections Data StructureJava

  8. The Following User Says Thank You to KucerakJM For This Useful Post:

    copeg (May 10th, 2012)

  9. #8
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    Default Re: Lotto Problem logic error

    ok,
    1. i didnt solve the problem, just assist
    2. dont care about academic dishonesty, i got my degree 3 years ago so who cares

  10. #9
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    Default Re: Lotto Problem logic error

    @ridg18, if you read the article linked to above, you would understand - and given you don't seem to understand you did not read the article, hence ignored advice from another member (pretty disrespectful standard practice)

    Quote Originally Posted by ridg18 View Post
    ok,
    1. i didnt solve the problem
    I fail to see it that way - you posted code without ANY explanation about what you did, only - and I quote - "try this", and according to the original poster "it worked". Did you encourage them to understand why?


    Quote Originally Posted by ridg18 View Post
    2. dont care about academic dishonesty, i got my degree 3 years ago so who cares
    What about the learning experience of others? Do you not care that you are helping others cheat? If not, than you are on a pace to get banned from these forums.
    Last edited by copeg; May 10th, 2012 at 10:39 AM.

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