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Roedy Green · Guest

On Thu, 22 Jul 2004 18:12:19 GMT, "Tripwire2004"
<tripwire (AT) REMOVE_ME (DOT) ntlworld.com> wrote or quoted :

Tripwire2004 · Guest

Hi,

I've been working through some exercises trying to learn how to code Java
into classes with constructors and everything, but I seem to be struggling
with even the simplest of programs. I've worked out how to send integers
and strings between the classes, but I am having serious trouble working
with arrays between the classes. I've managed to fill an array with some
data, but it is wrong. It should contain the values 5,10,20,50,100 but
instead it contains 10,3,0,0,0. I am sure that it will be something
simple I've forgotten and I'm hoping that someone here can help me. I
have included an example of the code which should demonstrate my problem.

Thanks

Elaine

/*******************************************************************/
import javax.swing.JOptionPane;

class ChangeDis
{
int [][] coins = new int [2][5];
private int moneyInserted;
private int costOfItem;

public ChangeDispenser () {
int coins [][] = {{5,10,20,50,100},{3,3,3,3,0}};
moneyInserted = 0;
costOfItem = 0;
}

public int[] getCoins() {
int coincount[] = new int[5];

for (int i = 0; i < coincount.length; i++) {
coincount[i] = coins[1][i];
}
return coincount;
}

public void addMoney(int coin) {
/**This method needs to add a coin value to moneyInserted. The
appropriate element of coins[][] needs to be updated, if no match is
found with the coin values 5,10,20,50,100 then the routine exits and
moneyInserted is not updated
**/
boolean printed = false;
for (int i = 0; i < coins.length; i++) {

if (coins[0][i] == coin) {
coins[1][i]++;
printed = true;
}
}
if (!printed)
JOptionPane.showMessageDialog(null,"Incorrect coin amount");
else
moneyInserted += coin;
}
}

class UseChangeDis
{
public static void main(String[] args) {
int coincount[];
int coinvals[];

ChangeDispenser obj = new ChangeDispenser();

coincount = obj.getCoins();

for (int k = 0; k < coincount.length; k++) {
System.out.println(coincount[k] +" ");
}
System.out.println();

obj.addMoney(20);

for (int k = 0; k < coincount.length; k++) {
System.out.print(coincount[k] +" ");
}
System.out.println();

System.exit(0);
}
}

Tripwire2004 · Guest

"Roedy Green" <look-on (AT) mindprod (DOT) com.invalid> wrote