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+--- Thread: Need help with a Java programming assignment (/showthread.php?tid=19978)
Need help with a Java programming assignment - Cyadd - 2009-12-04
[COLOR="Red"]Hi guys, I'm having troubles.
http://pastie.org/728471
That is the code.
array1 is a template class with 30 people in it.
array is a template class with 8 vehicles in it.
What I want accomplished is that 8 random people's ids (an attribute of the People template class) are given a car.
What i have correct is that there are always 8 random people's id's chosen. The countV is also increased to 8.
What I'm having troubles with is always displaying 8 winners. More often than not, only 7 winners' names are shown. Sometimes 8, sometimes 6, once or twice 5.
Now, what is going wrong, and how can i always make 8 people's first names show up?
[/COLOR]
Need help with a Java programming assignment - Russt - 2009-12-04
The problem is that your algorithm just chooses 8 random numbers - it doesn't care whether there are repeats. When only 7 winners are displayed, that is because it chose one of them twice.
If you're allowed to rearrange the array, I think you can shuffle it (or partially shuffle it) and then print the first 8 as winners and the rest losers. If not, or if the IDs don't work the way I assume they do, you'll have to find some way of "re-rolling" IDs if they are already taken.
Need help with a Java programming assignment - Stereo - 2009-12-04
If someone wins multiple vehicles they're not printed multiple times.
Need help with a Java programming assignment - JoeTang - 2009-12-04
Never mind.
Easiest solution would be to allocate another array of 8 random non-repeating numbers for your lottery.
Code:
int countV=0;
while (countV<8)
{
int num=(int)(1+Math.random()*(30));
for (int i=0;i<=array1.length-1 ;i++ )
{
if (num == array1[i].getLotID() && array1[i].getFlag())
countV--;
else if (num == array1[i].getLotID())
{
//System.out.println("TEST");
//System.out.println(array1[i].toStringP());
array1[i].setVehicleProject(array[countV]);
array1[i].setFlag(true);
}
}
countV++;
}
for (int i=0;i<=array1.length-1 ;i++ )
{
if (array1[i].getFlag())
{
System.out.println(array1[i].getFirstName()+" is a Winner");
}
else
{
System.out.println(array1[i].getFirstName()+" is a Loser");
}
}This should work too, though I'm not 100% sure about the implementation of your code.
Need help with a Java programming assignment - Cyadd - 2009-12-05
[COLOR="Red"]I see. well, to be honest, later in the project i need to choose a different ID if a person was already chosen...
But i'll try what you guys stated here.[/COLOR]