java - Rounding error gives me invalid answer -

i'm having problem rounding. reason can't round testp tenth place. example, on first given example (alex smith) gives me answer of 82.0, should 82.6.

here assignment has examples: http://www.hpcodewars.org/past/cw5/problems/average.htm

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 open file                 }                 catch(exception e){                         system.out.println("could not open file named "+ filename); // if doesn't find it, tell them                         system.exit(0);  // , exit.                 }                 //write                 try{                         outputstream = new printwriter(new fileoutputstream(filename2,true)); //try create file                 }                 catch(exception e){                         system.out.println("could not open file named "+ filename2); // if doesn't find it, tell them                         system.exit(0);  // , 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];                                         (int =0, p=2; < numh; i++, p++){     //collects homework grades.                                                 arrayh[i] = integer.valueof(nameparts[p]);                                                 temp = temp + arrayh[i];                                         }                                         homeworkp = (temp - arraymin(arrayh))/(numh-1) ; //gets percentage rounded decimal.                                         //system.out.println("homep: " + homeworkp);                                         temp =0;                                         num = 0;                                         (int p = numh; p < numt + numh; p++){      //collects test grades.                                                         num = num + integer.valueof(nameparts[p]);                                         }                                         double testp =num/numt; //gets percentage 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 = 0;             int min = integer.max_value;             if (arr == null) {                 return 0;             } else {                 while (i < arr.length) {                     if (arr[i] < min) {                       min = arr[i];                     }                     i++;                 }             }             return min;         } } 

change

double testp =num/numt; 

to

double testp = ((double) num) / numt; 

as num , numt int, have integer division, 0 instead of 0.xyz...