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PORounding error gives me invalid answer
 

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  1. PORounding error gives me invalid answer
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    <p>I'm having a problem with rounding. For some reason I can't round <code>testP</code> to the tenth place. For example, on the first given example (Alex Smith) it gives me the answer of 82.0, but it should be 82.6. </p> <p>Here is the assignment that has the examples: <a href="http://www.hpcodewars.org/past/cw5/problems/Average.htm" rel="nofollow">http://www.hpcodewars.org/past/cw5/problems/Average.htm</a></p> <pre><code>import java.io.File; import java.io.FileOutputStream; import java.io.PrintWriter; import java.math.*; import java.util.Scanner; public class Average { public static void main(String[] args) { int num = 0, temp =0;; String fileName="AverageInput.txt"; String fileName2="AverageOutput.txt"; Scanner inputStream = null; PrintWriter outputStream = null; double homeworkP = 0; //read try{ inputStream = new Scanner(new File(fileName)); //try to open the file } catch(Exception e){ System.out.println("Could not open the file named "+ fileName); // if it doesn't find it, tell them System.exit(0); // and then exit. } //write try{ outputStream = new PrintWriter(new FileOutputStream(fileName2,true)); //try to create the file } catch(Exception e){ System.out.println("Could not open the file named "+ fileName2); // if it doesn't find it, tell them System.exit(0); // and then exit. } int numH = inputStream.nextInt(); int numT = inputStream.nextInt(); int[] arrayH = new int[numH]; outputStream.println("Averages"); String blank = inputStream.nextLine(); while (inputStream.hasNextLine()){ String line = inputStream.nextLine().replaceAll(" H","").replaceAll(" T",""); String[] nameParts = line.split(" "); String name = nameParts[0] +" "+ nameParts[1]; for (int i =0, p=2; i &lt; numH; i++, p++){ //collects homework grades. arrayH[i] = Integer.valueOf(nameParts[p]); temp = temp + arrayH[i]; } homeworkP = (temp - arrayMin(arrayH))/(numH-1) ; //gets percentage as rounded decimal. //System.out.println("homeP: " + homeworkP); temp =0; num = 0; for (int p = numH; p &lt; numT + numH; p++){ //collects test grades. num = num + Integer.valueOf(nameParts[p]); } double testP =num/numT; //gets percentage as decimal. System.out.println("homep: "+ homeworkP + "TestP: "+ testP); double TotalP = (homeworkP * 40) + (testP * 60); System.out.println(name + " " + TotalP); } outputStream.close(); inputStream.close(); } public static int arrayMin(int[] arr) { int i = 0; int min = Integer.MAX_VALUE; if (arr == null) { return 0; } else { while (i &lt; arr.length) { if (arr[i] &lt; min) { min = arr[i]; } i++; } } return min; } } </code></pre>
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    1. USMikeTheLiar
    1. USKhalob C
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      1. PORounding error gives me invalid answer
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    1. CO"for some reason I can't round `testP` to the tenth place` implies that you've tried to. What have you tried? What is it doing wrong? Hint: you're going to want to try a ROUNDING FUNCTION.
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      1. PORounding error gives me invalid answer
      1. USColleen
    2. COSorry for not explaining further, this is a piece of code that i was edited multiple times. I had tried using Math.round and other things before. May i suggest you be more kind?
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      1. PORounding error gives me invalid answer
      1. USKhalob C
 

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