{ //this one is missing at the beginning of the loop.
 ...
}while ();

 while(num1<0 || num2<0 || num3<0 || num4<0 || num5<0 || num6<0 || num<0 || num8<0 || num9<0 || num10<0);

{
  System.out.println("input a number greater then zero");
  num1=Course_io.readlnt();
}

{
  System.out ...
  num1 = ...
  System.out ...
  num2 = ...
} while (num1 < 0 || num2 < 0 || ...);

public static void main (String[] args) {
  int num;
  do {
    num = 6;
  } while (num < 5);
  if (num == 6)
    System.out.println ("No compilation error");
}

/*Program which reads in 10 numbers and adds them together,
if the user inputs negative number it is ignored and the running total
is not updated*/
import java.io.*; //tell the compiler where to find IOException
class q3 {//name of program
    public static void main(String[] args) throws IOException
    {
    int num1, num2, num3, num4, num5, num6, num7, num8, num9, num10, sum;/*decalare and intialise variables*/
 
 
            	do{System.out.println("input a number greater then zero");
    	      num1=Course_io.readlnt;
                   System.out.println("input a number greater then zero");
                  num2=Course_io.readlnt();
                System.out.println("input a number greater then zero");
                  num3=Course_io.readlnt();
    	      System.out.println("input a number greater then zero");
    	      num4=Course_io.readlnt();
    	      System.out.println("input a number greater then zero");
    	      num5 = Course_io.readlnt();
    	      System.out.println("input a number greater then zero");
    	      num6=Course_io.readlnt();
    	      System.out.println("input a number greater then zero");
    	      num7=Course_io.readlnt();
    	      System.out.println("input a number greater then zero");
    	      num8=Course_io.readlnt();
    	      System.out.println("input a number greater then zero");
    	      num9=Course_io.readlnt();
    	      System.out.println("input a number greater then zero");
    	      num10 = course_io.readlnt();
                  }
               while(num1<0 || num2<0 || num3<0 || num4<0 || num5<0 || num6<0 || num7<0 || num8<0 || num9<0 || num10<0);
 
                   	System.out.println("You entered a negative number");
 
                   if(num1>0 || num2>0 || num3>0 || num4>0 || num5>0 || num6>0 || num7>0 || num8>0 || num9>0 || num10>0);
 
                   	sum = num1+num2+num3+num4+num5+num6+num7+num8+num9+num10;
                           System.out.println("The answer:"+sum);
                           }
   }

javac   -d . -g -nowarn "C:\Java Programs\q3.java" 
 
C:\Java Programs\q3.java:12: cannot resolve symbol
symbol  : variable Course_io 
location: class q3
    	      num1=Course_io.readlnt;
                   ^
C:\Java Programs\q3.java:14: cannot resolve symbol
symbol  : variable Course_io
location: class q3
                  num2=Course_io.readlnt();
                       ^
C:\Java Programs\q3.java:16: cannot resolve symbol
symbol  : variable Course_io 
location: class q3
                  num3=Course_io.readlnt();
                       ^
C:\Java Programs\q3.java:18: cannot resolve symbol
symbol  : variable Course_io 
location: class q3
    	      num4=Course_io.readlnt();
                   ^
C:\Java Programs\q3.java:20: cannot resolve symbol
symbol  : variable Course_io 
location: class q3
    	      num5 = Course_io.readlnt();
                     ^
C:\Java Programs\q3.java:22: cannot resolve symbol
symbol  : variable Course_io 
location: class q3
    	      num6=Course_io.readlnt();
                   ^
C:\Java Programs\q3.java:24: cannot resolve symbol
symbol  : variable Course_io 
location: class q3
    	      num7=Course_io.readlnt();
                   ^
C:\Java Programs\q3.java:26: cannot resolve symbol
symbol  : variable Course_io 
location: class q3
    	      num8=Course_io.readlnt();
                   ^
C:\Java Programs\q3.java:28: cannot resolve symbol
symbol  : variable Course_io 
location: class q3
    	      num9=Course_io.readlnt();
                   ^
C:\Java Programs\q3.java:30: cannot resolve symbol
symbol  : variable course_io 
location: class q3
    	      num10 = course_io.readlnt();
                      ^
10 errors

import packagename.Course_io;

num1 = Course_io.readlnt();

num1 = packagename.Course_io.readlnt();

/*
 * Created on Mar 31, 2005
 * @author Matt Gerrans
 */
public class Numbskull
{
   private static void println(String s) { System.out.println(s); }
   private static void print(String s) { System.out.print(s); }
   public static void main(String[] args)
   {
      java.io.BufferedReader input = new java.io.BufferedReader( new java.io.InputStreamReader(System.in) );
      long sum = 0;
      int numCount = 0;
      while( numCount < 10 )
      {
         println("Input a number that's greater then zero.");
         print( (numCount+1) + ". ");
         try
         {
            try
            {
               int read = Integer.parseInt( input.readLine() );
               if( read < 0 )
                  println("Sorry, no negative numbers, please.");
               else
               {               
                  numCount++;
                  sum += read;
               }
            }
            catch( java.lang.NumberFormatException nfe )
            {
               println("Please enter an integer value.");
            }
         }
         catch( java.io.IOException ioe )
         {
            println("Ack!  I can't read that junk!");
         }
      }
      println("The sum of your numbers is " + sum + "." );
   }
}