Thread: Percentage Array Help

I guess what I am stuck on is actually how do I assign the votes for each candidate to the percentage variable at the end not every time a vote is inputed by the user so this is as far as can go without having a problem.

I can set up the double percentage now but cant print it outside the brackets only inside which isnt any use because the assignment of values hasnt completed so its not correct to have it there.

import java.util.Scanner;
class Election
{
 public static void main(String args[]) throws Exception
 {
  Scanner in = new Scanner(System.in);
 
  String[] candidate = new String[5];
  int[] votes = new int[5];
 
  int totalVotes = 0;  
  int currentCandidate = 0;
  int sum = 0;
 
  while(currentCandidate < candidate.length)
  {
   System.out.println("Please enter candidates last name: ");
   candidate[currentCandidate] = in.next();
   currentCandidate++;
  }
 
  for(int i = 0; i < candidate.length; i++)
  {
    System.out.println("Please enter the total votes for " + candidate[i]);
    votes[i] = in.nextInt();
    sum += votes[i];
    double percentage = (double) votes[i] / (double) sum * 100;
 
   }
 
 
 
  }
}

Originally Posted by Norm

Define the variable outside of the brackets within the same pair of {}s where you want to print it.
Add values to the variable inside the loop.


What is the formula for computing a percentage? Shouldn't the division be done AFTER the all the values have been summed up?

im really confused if i move it out like so

 
 
 
 for(int i = 0; i < candidate.length; i++)
  {
    System.out.println("Please enter the total votes for " + candidate[i]);
    votes[i] = in.nextInt();
    sum += votes[i];
 
   }
  double percentage = (double) votes[i] / (double) sum * 100;

it just says

Error: cannot find symbol
symbol: variable i
location: class Election

i don't really get what you are asking me to do?

Im just focusing on the percentage part of the program after i have taken in the names and the votes just to test it works before adding in the end so just want to a print out of all the percentages for now to see they are running ok. this is my first week doing Arrays and Im still not used to them and I have been given no examples with this only getting highest numbers and averages etc so thats why im so lost.

I don't know any formula other than what i said the candidates vote / the total votes and * by 100 I haven't been given a formula.

vote is the candidates vote and sum is the total votes i changed it so its simpler

import java.util.Scanner;
class Election2
{
 public static void main(String args[]) throws Exception
 {
  Scanner in = new Scanner(System.in);
 
  String[] candidate = new String[5]; // candidates last name
  int[] votes = new int[5]; // candidates votes
 
 
 
  int sum = 0; // total votes
 
 
 
  for(int i = 0; i < candidate.length; i++)
  {
   System.out.println("Please enter candidates last name: ");
   candidate[i] = in.next();
   System.out.println("Please enter the total votes for " + candidate[i]);
   votes[i] = in.nextInt();
   sum += votes[i];
   double percentage = (double) votes[i] / (double) sum * 100;
  }
 
 }
}

I'm looking for help with this I don't know what I am doing wrong I know that having

double percentage = (double) votes[i] / (double) sum * 100;

in the for loop isnt doing what I want it to do because its not finished looping but as I have said if I declare it in another array it just says that it cant find the variable. I'm only doing programming in college a couple of week and only had one lecture on parallel arrays so I don't know what to do that why I am asking you?

she also covered how to search an array and then get different outcomes should I be doing that to get the percentage?

I know how to get it if its a normal program its just arrays Im not fully aware of the structures.

no i don't understand what you mean if you could just give me an example of what you are talking about then I would know.

If you mean that I cant work with the percentage until the loop has finished getting the value of sum that's what I am trying to do but don't know how

got it working thanks for the help!

Just one thing how to I format the percentage to 2 decimal places?

 import java.util.Scanner;
class Election2
{
 public static void main(String args[]) throws Exception
 {
  Scanner in = new Scanner(System.in);
 
  String[] candidate = new String[5]; // candidates last name
  int[] votes = new int[5]; // candidates votes
  double[] percentage = new double[5]; // candidates percentage
 
 
 
  int sum = 0; // total votes
 
 
 
  for(int i = 0; i < candidate.length; i++)
  {
   System.out.println("Please enter candidates last name: ");
   candidate[i] = in.next();
   System.out.println("Please enter the total votes for " + candidate[i]);
   votes[i] = in.nextInt();
   sum += votes[i];
 
   }
 
 
 
  for(int i = 0; i < votes.length; i++)
  {
    percentage[i] = (double) votes[i] / (double) sum * 100.0; 
  }
 
  int max = votes[0];
  for (int i = 0; i < votes.length; i++)
  {
    if(votes[i] > max)
    max = votes[i];
  }
 
  System.out.println("  The result of the election is:" + "\n");
  System.out.println("Candidate" + "\t" + "Votes" + "\t" + "% of Total Votes" + "\t");
 
   for(int i = 0; i < votes.length; i++)
  {
     System.out.println(candidate[i] + "\t" + votes[i] + "\t" + "%" + percentage[i] + "\t");
  }
 
   System.out.println("\n" + "The winner of the election is: " + max);
 
 
 
 
 }
}

Originally Posted by Norm

Where are the names?

the names are the candidate variable.

but need to output the name of the candidate with the max votes which I have but can only print out the max votes not the candidates name that had the max votes.

I don't understand how to do that how to save the index into the array where the max value was found?

I'm really no expert I find if I am given an example then I learn from my mistakes you may aswell be telling me to speak Chinese here.

im sorry but I don't know how to do what you are saying to do.

save the value of the index in the int variable defined in the first step

I did it finally!!
Thank u so much for the help I can now submit it and go to bed!!!

 
The result of the election is:
 
 
Candidate	Votes	% of Total Votes
a	1	6.67
b	2	13.33
c	3	20.00
d	4	26.67
e	5	33.33
 
The winner of the election is: e

--- Update ---

except in my program the table is tabbed the right way!!