Getting the Percentage of Every Outcome Help Java Program

[coder752]

I made a dice rolls program where it counts how many of each face value on a die (1-6)

But I'm having problems getting it to output the outcome of each as a percentage of the number of rolls. I keep getting 0 as my percentage output for each of the face values.

Also, another question, how do I print all the above info including the data for outcomes for each roll into a table?

Here's my code:

import java.util.Scanner;
import java.util.Random;

class MyRandomOutcomes{

public static void main(String[] args) {
Random random = new Random();
Scanner input = new Scanner(System.in);
int x,sum1,sum2,sum3,sum4,sum5,sum6;
System.out.println("Enter the number of rolls: ");
x = input.nextInt();
int oneCntr = 0;
int twoCntr = 0;
int threeCntr = 0;
int fourCntr = 0;
int fiveCntr = 0;
int sixCntr = 0;


for(int i = 1; i <= x; i++){
int num = random.nextInt(6) + 1;
if(num==1){
sum1= oneCntr++;
}
if(num==2){
sum2= twoCntr++;
}
if(num==3){
sum3= threeCntr++;
}
if(num==4){
sum4= fourCntr++;
}
if(num==5){
sum5= fiveCntr++;
}
if(num==6){
sum6= sixCntr++;
}
}
//System.out.println(num);
System.out.println("The face value 1 occured:" +oneCntr);
System.out.println("In percent face value 1 occurred:" +oneCntr*((x/10)*100));
System.out.println("The face value 2 occured:" +twoCntr);
System.out.println("In percent face value 2 occurred:"+twoCntr*((x/10)*100));
System.out.println("The face value 3 occurred:" +threeCntr);
System.out.println("In percent face value 3 occurred:" +threeCntr*((x/10)*100));
System.out.println("The face value 4 occured:" +fourCntr);
System.out.println("In percent face value 4 occurred:" +fourCntr*((x/10)*100));
System.out.println("The face value 5 occured:" +fiveCntr);
System.out.println("In percent face value 5 occurred:" +fiveCntr*((x/10)*100));
System.out.println("The face value 6 occured:" +sixCntr);
System.out.println("In percent face value 6 occurred:" +sixCntr*((x/10)*100));
}
}

[keang]

When dealing with integer math you need to remember that there are no floating point results anywhere throughout the calculation so if, for example, you divide 5 by 10 the result is 0. Siimilarly 5 divided by 10 and then multplied by 100 is still 0, whereas 5 multiplied by 100 and then divided by 10 is 50.

So for ((x/10)*100), if x is less than 10 the result is always going to be zero; if x is between 10 and 19 the result will be 100, if x is between 20 and 29 the result will be 200 etc etc. Obviously this isn't how you calculate a percentage so you may want to look at your calculation.

You may also want to look at all that repeated code, if you use an array to store the results you can get rid of all the if statements (which should have been if-else statements) and you'd only need 1 print statement inside a for loop.

[coder752]

Now how do I implement this for a JTable so that the outcomes and percentages get put into a table?

[keang]

You read a tutorial on using JTable

[coder752]

Are there any other examples...I need simpler examples. Should I add this JTable to the program above or separate?

[dlorde]

Are there any other examples...I need simpler examples.

If the SimpleTableDemo.java given in the tutorial isn't simple enough, I don't see how you are going to be able to use JTable... You assemble your data, put it into the table, put the table into a scroll pane and put the scroll pane into your GUI. That's all, for the simple case.

Why not copy the code, get it to run, and try to understand it - the tutorial explains it all. If you need more than the simple code there, the tutorial takes you through more flexible and custom ways of using tables, complete with example code. Some effort is required to make progress in anything.

If you don't understand something, just ask.

They know enough who know how to learn...
J. Adams