Using Java how do I use a class type array to store user details
Hi,
I have the attached code.
I have purposly only used one class and arrays as this was a requirement. How can I modify the code to allow the user to place up to 20 bets (each bet is 6 different numbers between 1 and 49) at a cost of £1 per bet. Basically I need to modify my class to also prompt the user for his/her name and how many bets they would like to make (up to 20 bets) keeping track of how much they are due for the amount of bets they have made. I also need to give the user the option of a lucky dip where the program chooses 6 random numbers for them.
Thanks.
I have the attached code.
I have purposly only used one class and arrays as this was a requirement. How can I modify the code to allow the user to place up to 20 bets (each bet is 6 different numbers between 1 and 49) at a cost of £1 per bet. Basically I need to modify my class to also prompt the user for his/her name and how many bets they would like to make (up to 20 bets) keeping track of how much they are due for the amount of bets they have made. I also need to give the user the option of a lucky dip where the program chooses 6 random numbers for them.
import java.util.Scanner;
import java.util.Random;
public class LotteryNumbers
{
public static void main(String[] args)
{
System.out.println( "Play Lottery : 6/49" + "\n");
// Part 1: Pick six numbers, between 1 and 49.
// and put them in an arry of six numbers
int [] P = new int [6];
// Create a Scanner input from keyboard
System.out.println("Part1: \n");
System.out.println( "£1 for a line of six numbers. Play!" + "\n");
System.out.println("Enter your lottery numbers- enter one number at a time.");
for (int index =0; index <6; index++)
{
Scanner keyboard = new Scanner (System.in);
System.out.print("# " + (index+1) + ": ");
P[index] = keyboard.nextInt();
}
while (
(P[0] < 1|| P[0] >49)||
(P[1] < 1|| P[1] >49)||
(P[2] < 1|| P[2] >49)||
(P[3] < 1|| P[3] >49)||
(P[4] < 1|| P[4] >49)||
(P[5] < 1|| P[5] >49)
||
P[0] == P[1] || P[0] == P[2] || P[0] ==P[3] || P[0]== P[4] || P[0] ==P[5]||
P[1] == P[2] || P[1] ==P[3] || P[1] ==P[4] || P[1]== P[5] ||
P[2] == P[3] || P[2] ==P[4] || P[2] ==P[5] ||
P[3] == P[4] || P[3] ==P[5] ||
P[4] == P[5]
)
{
System.out.println( "Error: Please use numbers between 1 and 49 inclusive, and no repititions");
for (int index =0; index <6; index++)
{
Scanner keyboard = new Scanner (System.in);
System.out.print(" Pick # " + (index+1) + ": ");
P[index] = keyboard.nextInt();
}
}
// Part 1B": Put your numbers pick in inmcreasing order. Sort the numbers from lowest to highest.
int startScan, index, minIndex, minValue;
for ( startScan= 0; startScan <(P.length-1); startScan++)
{
minIndex = startScan;
minValue = P[startScan];
for ( index = startScan +1; index <P.length; index++)
{
if (P[index] < minValue)
{
minValue = P[index];
minIndex =index;
}
}
P[minIndex] = P[startScan];
P[startScan] =minValue;
}
System.out. println ( "This is the sorted list of your numbers:");
for (int j =0; j <P.length; j++)
System.out. print ( P[j] + " ");
System.out.println ("End of part 1 \n\n");
System.out.println();
// Part 2: Generate 6 random numbers for lottery draw
System.out.println( "Part2:");
// Create a Random class object.
// Let the lottery numbers be:
int N1, N2, N3, N4, N5, N6 ; // random numbers
Random randomNumber = new Random();
// Let
N1=1; N2 = 1; N3 = 1; N4 = 1; N5=1; N6= 1;
while ( N1 <1 || N2 <1 || N3 <1 || N4 <1 ||N5 < 1 || N6 <1 ||
N1==N2 || N1==N3 || N1==N4 || N1==N5 || N1==N6||
N2==N3 || N2==N4 || N2==N5 || N2==N6 ||
N3==N4 || N3==N5 || N3==N6 ||
N4==N5 || N4==N6 ||
N5==N6
)
{
N1 = randomNumber.nextInt(49); N2 = randomNumber.nextInt(49); N3 = randomNumber.nextInt(49);
N4 = randomNumber.nextInt(49); N5 = randomNumber.nextInt(49); N6 = randomNumber.nextInt(49);
}
// Create an array of the Lottery random numbers
int [] lotteryNumbers = new int [6];
lotteryNumbers[0] = N1; lotteryNumbers[1] = N2; lotteryNumbers[2] = N3;
lotteryNumbers[3] = N4; lotteryNumbers[4] = N5; lotteryNumbers[5] = N6;
System.out. println ("The Random-Draw Lottery Numbers are:");
for (int j =0; j <lotteryNumbers.length; j++)
System.out. println ( "# " + (j+1) + "\t" + lotteryNumbers[j]);
System.out. println ();
// sort the numbers from lowest to highest.
for ( startScan= 0; startScan <(lotteryNumbers.length-1); startScan++)
{
minIndex = startScan;
minValue = lotteryNumbers[startScan];
for ( index = startScan +1; index <lotteryNumbers.length; index++)
{
if (lotteryNumbers[index] < minValue)
{
minValue = lotteryNumbers[index];
minIndex =index;
}
}
lotteryNumbers[minIndex] = lotteryNumbers[startScan];
lotteryNumbers[startScan] =minValue;
}
System.out. println( "This is the sorted list of lottery-draw numbers:");
for (int j =0; j <lotteryNumbers.length; j++)
System.out. print ( lotteryNumbers[j] + " ");
//
System.out.println( "End of part 2 \n\n");
System.out.println();
// Part 3: check lottery numbers - see if P[] == lotteryNumbers[]
// Let
System.out.println( "Part3: lottery check!"+ "\n\n");
int count = 0;
for ( index = 0; index <6;index++)
{
for (int L = 0; L <6; L++)
if ( P[index] == lotteryNumbers[L])
count++;
}
System.out.println("You matched: " + count + " number(s)!");
if( count == 0 )
System.out.println( "Sorry, You are not a winner this time."+ "\n" );
if( count == 1 )
System.out.println( "You win £1."+"\n" );
if( count == 2 )
System.out.println( "You win £2."+"\n");
if( count == 3)
System.out.println( "You win £3."+"\n");
if( count == 4)
System.out.println( "You win £4."+"\n");
if( count == 5)
System.out.println( "You win £50."+"\n");
if( count == 6)
System.out.println( "You win the jackpot of £1000."+"\n");
}
}
Thanks.
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Use a String to hold the user name, an int to hold the number of bets and change your array to a matrix of 20x6. Populate it based on how many bets the user wants to place.
Well, you currently have:
This portion of code looks to me like you're using two arrays instead of your requirement of one, unless I misread what you wrote.
What I would do is create several class variables:
For example, you could do this:
int [] P = new int [6];
...
int [] lotteryNumbers = new int [6];
This portion of code looks to me like you're using two arrays instead of your requirement of one, unless I misread what you wrote.
What I would do is create several class variables:
String clientName;
int numBets;
int [][] lotteryNumbers = new int [20][6];
For example, you could do this:
public static void main(String[] args)
{
...
// get the user's name
System.out.println("What is your name?");
clientName = keyboard.next();
// find the number of bets
System.out.println("How many bets would you like to make (up to 20)?");
numBets = keyboard.nextInt();
...
Hi gatorvip,
My requirements state to use only one class but I can use multiple arrays.
Am I best still to use your 20x6 array? If so, I'm stuggling to combine my two arrays into one as my existing code is dependant on P[index] which I am struggling to find with your approach.
Thanks.
My requirements state to use only one class but I can use multiple arrays.
Am I best still to use your 20x6 array? If so, I'm stuggling to combine my two arrays into one as my existing code is dependant on P[index] which I am struggling to find with your approach.
Thanks.
OK, then I misread your requirement.
Personally I would use a single array to hold the user bets because it's cleaner that way, but it's really up to you. I would set it up in the following way:
a) 1 fixed 1x6 array to hold the actual lottery numbers
b) 1 fixed 20x6 array (or 1 dynamic numBets x 6 array ) to hold the user input
Your P[index] won't really change, you'll just put it inside an additional loop that allows for the extra bets.
So, for example:
Personally I would use a single array to hold the user bets because it's cleaner that way, but it's really up to you. I would set it up in the following way:
a) 1 fixed 1x6 array to hold the actual lottery numbers
b) 1 fixed 20x6 array (or 1 dynamic numBets x 6 array ) to hold the user input
Your P[index] won't really change, you'll just put it inside an additional loop that allows for the extra bets.
So, for example:
...
int numBets; // holds the number of bets
int [][] userBets = new int [20][6]; // holds the user numbers
...
for (int bet=0; bet<numBets; bet++)
{
for (int pos=0; pos<6; pos++)
{
-- get user numbers here
userBets[bet][pos] = ... read input
}
}
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