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Thread: Creation of lotto type program

  1. #1
    Junior Member luke's Avatar
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    Default Creation of lotto type program

    alright, this is the last bit of help i need for the program, we have been asked to create a lotto type program, since i finished early i've decided to add some error checkers. one being that you cannot enter the same number twice.

    package lotto;
    import java.util.*;
    public class Main {
        public static void main(String[] args) {
            int totalcount = 0;
            say("Welcome to The lotto!");
            int[] userinput;// declaring a new array of chars
            userinput = new int[6];//allocating 6 slots for memory
        [COLOR="Red"]    for (int array = 0; array < 6; ++array) {
                userinput[array] = finduserinput();
            }[/COLOR]
            int[] Computernumber;
            Computernumber = new int[6];
            for (int array2 = 0; array2 < 6; ++array2) {
                int tempstore = findcomputernumber();
                for(int loop = 0; loop < 6;++loop){
                   if(tempstore == Computernumber[loop] ) {
                       tempstore = findcomputernumber();
                   }
                   else{
     
                   }
                }
                Computernumber[array2] = tempstore;
                say("Random number is : " +Computernumber[array2]);
     
            }
            for (int count = 0; count < 6; ++count){
                for(int count2 = 0; count2 < 6; ++count2){
                    if(userinput[count] == Computernumber[count2]){
                        totalcount = (totalcount + 1);
                    }
                }
            }
            say("you had "+totalcount+" matches");
    if(totalcount < 3){
        say("You have won nothing.");
    }if(totalcount > 4){
        say("You have won one million dollars!");
    }else{
                int randomwin = findrandomwin();
    }
     
        }
        public static void say(String aMessage) {
            System.out.println(aMessage);
        }
        [COLOR="Red"]public static int finduserinput() {
            int name = 1;
            say("please choose a number between 0 and 40");
            try {
                Scanner scan1 = new Scanner(System.in);
                name = scan1.nextInt();
            } catch (InputMismatchException ime) {
                say("There was an error in your typing please make sure the value entered is within the set parametres");
                finduserinput();
            }
            if (name > -1 && name < 41) {
            } else {
                say("That was not a valid number please check your number and try again");
                finduserinput();
            }
            return name;
        }[/COLOR]
        public static int findcomputernumber() {
            Random Rndnumber = new Random();
            int RandomNum = Rndnumber.nextInt(41);
            return RandomNum;
        }
        public static int findrandomwin(){
            Random Rnd = new Random();
            int Randomwin = Rnd.nextInt(101);
            return Randomwin;
        }
    }
    the area's highlighted are the area's where the code will be inserted i think.. i'm not asking for the exact code needed, but rather an example or hint as to what i will need to do.

    cheers,
    luke.


  2. #2
    mmm.. coffee JavaPF's Avatar
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    Default Re: last one

    Hello luke,

    You are going to need an if statement to compare the value of the userinput array with the inputted name value.

    This is how I would probably do it. I have made my code changes bold.

    import java.util.*;
     
    public class Main {
     
       [B] public static int[] userinput = new int[6];[/B]
     
        public static void main(String[] args) {
     
           [B] Arrays.fill(userinput, -1);[/B]
     
            int totalcount = 0;
            say("Welcome to The lotto!");
     
            for (int array = 0; array < 6; ++array) {
     
                userinput[array] = finduserinput();
     
            }
     
            int[] Computernumber;
            Computernumber = new int[6];
            for (int array2 = 0; array2 < 6; ++array2) {
                int tempstore = findcomputernumber();
                for (int loop = 0; loop < 6; ++loop) {
                    if (tempstore == Computernumber[loop]) {
                        tempstore = findcomputernumber();
                    } else {
     
                    }
                }
                Computernumber[array2] = tempstore;
                say("Random number is : " + Computernumber[array2]);
     
            }
            for (int count = 0; count < 6; ++count) {
                for (int count2 = 0; count2 < 6; ++count2) {
                    if (userinput[count] == Computernumber[count2]) {
                        totalcount = (totalcount + 1);
                    }
                }
            }
            say("you had " + totalcount + " matches");
            if (totalcount < 3) {
                say("You have won nothing.");
            }
            if (totalcount > 4) {
                say("You have won one million dollars!");
            } else {
                int randomwin = findrandomwin();
            }
     
        }
     
        public static void say(String aMessage) {
            System.out.println(aMessage);
        }
     
        public static int finduserinput() {
            [B]int name = -1;[/B]
            say("please choose a number between 0 and 40");
            try {
                Scanner scan1 = new Scanner(System.in);
                name = scan1.nextInt();
            } catch (InputMismatchException ime) {
                say("There was an error in your typing please make sure the value entered is within the set parametres");
                finduserinput();
            }
            if (name > -1 && name < 41) {
     
                [B]for (int array = 0; array < 6; ++array) {[/B]
     
                    [B]if(userinput[array] == name){[/B]
                      [B]  System.out.println("Duplicate number! You have entered " + name + " twice.");
                        finduserinput();
                        }[/B]
               [B] }[/B]
     
            } else {
                say("That was not a valid number please check your number and try again");
                finduserinput();
            }
            return name;
        }
     
        public static int findcomputernumber() {
            Random Rndnumber = new Random();
            int RandomNum = Rndnumber.nextInt(41);
            return RandomNum;
        }
     
        public static int findrandomwin() {
            Random Rnd = new Random();
            int Randomwin = Rnd.nextInt(101);
            return Randomwin;
        }
    }
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  3. #3
    Junior Member luke's Avatar
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    Default Re: last one

    hey mate, i think i see what you're doing there. could you please explain this to me; Arrays.fill(userinput, -1);
    thanks.
    cheers,
    luke.

  4. #4
    mmm.. coffee JavaPF's Avatar
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    Thumbs up Re: last one

    Quote Originally Posted by luke View Post
    hey mate, i think i see what you're doing there. could you please explain this to me; Arrays.fill(userinput, -1);
    thanks.
    cheers,
    luke.
    I have used this because the default array values are 0. When we loop through the array to check for duplicate entries, because 0 already exists, the message is printed asking you to enter another unique value. By setting all the array values to -1 first, this stops that from happening. If the range was 1 to 40 rather than 0 to 40 then we wouldn't need to do this. I hope you understand
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  5. #5
    Junior Member luke's Avatar
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    Default Re: last one

    understand perfectly, i will not mark this thread as solved though as i plan to ask another question on it later tonight.

    cheers,
    luke.

  6. #6
    Junior Member luke's Avatar
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    Default Re: last one

    alright, very last bit of it.

    package lotto;

    import java.util.*;

    public class Main {

    public static int[] userinput = new int[6];// declaring a new array of chars
    public static int[] Computernumber = new int[6];

    public static void main(String[] args) {
    int money = 40;
    int totalcount = 0;
    int repeat = 0;
    for (; repeat == 0 {
    Arrays.fill(userinput, 0);
    Arrays.fill(Computernumber, 0);
    say("Welcome to The lotto! each game will cost you 5 fun coupons");


    for (int array = 0; array < 6; ++array) {
    userinput[array] = finduserinput();


    }

    for (int array2 = 0; array2 < 6; ++array2) {
    Computernumber[array2] = findcomputernumber();
    say("Random number is : " + Computernumber[array2]);

    }
    for (int count = 0; count < 6; ++count) {
    for (int count2 = 0; count2 < 6; ++count2) {
    if (userinput[count] == Computernumber[count2]) {
    totalcount = (totalcount + 1);
    }
    }
    }
    say("you had " + totalcount + " matches");
    if (totalcount < 3) {
    say("You have won nothing.");
    }
    if (totalcount > 4) {
    say("You have won one million dollars!");
    money = (money + 1000000);
    } else {
    int randomwin = findrandomwin();
    money = (money + randomwin);
    }
    repeat = askrepeat();
    }
    }

    public static void say(String aMessage) {
    System.out.println(aMessage);
    }

    public static int finduserinput() {
    int name = 1;
    say("please choose a number between 1 and 40");
    try {
    Scanner scan1 = new Scanner(System.in);
    name = scan1.nextInt();
    } catch (InputMismatchException ime) {
    say("There was an error in your typing please make sure the value entered is within the set parametres");
    finduserinput();
    }
    if (name > 0 && name < 41) {
    } else {
    say("That was not a valid number please check your number and try again");
    finduserinput();
    }
    for (int array = 0; array < 6; ++array) {
    if (userinput[array] == name) {
    say("You cannot repeat your number input please enter another number.");
    finduserinput();
    } else {
    }
    }
    return name;
    }

    public static int findcomputernumber() {
    Random Rndnumber = new Random();
    int RandomNum = Rndnumber.nextInt(7);
    for (int array = 0; array < 6; ++array){
    if(RandomNum == Computernumber[array]){


    findcomputernumber();
    }

    }
    return RandomNum;
    }


    public static int findrandomwin() {
    Random Rnd = new Random();
    int Randomwin = Rnd.nextInt(101);
    return Randomwin;
    }

    public static int askrepeat() {
    say("you have " + "Fun coupons left would you like to play again?");
    int answer = 0;
    try {
    answer = System.in.read();
    System.in.read();
    } catch (Exception e) {
    say("Error in input");
    askrepeat();

    }
    if (answer == 89 || answer == 121) {
    answer = 0;
    } else if (answer == 78 || answer == 110) {
    answer = 1;
    }
    return answer;
    }
    }
    i tried to replicate what you have done, in making sure that the same number is not generated by the computer, but it seemed to fail. i still got this output.
    Random number is : 0
    Random number is : 2
    Random number is : 5
    Random number is : 3
    Random number is : 3
    Random number is : 3
    any help??


    cheers,
    luke.