Array of ten numbers

[Finbarrs Oketunji]

Write a program to find the highest out of an array of ten numbers?

[Bear Bibeault]

Sounds like fun. What have you tried so far?

[Finbarrs Oketunji]

Let's say I am a Newbie in JAVA that needs help with that and I have gone beyond the Hello World thing.

[marc weber]

Originally posted by Finbarrs Oketunji:
Let's say I am a Newbie in JAVA that needs help with that and I have gone beyond the Hello World thing.

Then this sounds like a great exercise!

Do you know how to create the array? Can you describe a general process for finding that largest number?

[Finbarrs Oketunji]

This is what I have been able to do:

 
import java.io.*;
 
public class Accept{
  public static void main(String[] args) throws IOException{
  String str;
  int value[]=new int[10];
  for(int a=0;a<10;a++){
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter Number : ");
str=br.readLine();
value=Integer.parseInt(str);
}
System.out.println(compare());
}
 
public static Integer compare(){
  int largest=new int[10];
  For(int k=0;k<10;k++){
       if (value[k] > largest )
          largest=value[k];
  }   
return largest;         
}
} 

[Joanne Neal]

You're trying to assign an int array to an int variable. Instead you should initialise the 'largest' variable to the first value in the array

int largest = value[0]

Java is also case sensitive - 'For' should be 'for'

Make those changes and then if you are still having problems, post your new code and tell us what the problems are - if it doesn't compile show the error messages. If it doesn't work as you expect, tell us what it is doing and why this isn't what you want it to do.

[Finbarrs Oketunji]

I included it but it isn't still compiling so I re-wrote another one to give an output of the highest number the same thing keeps occurring, help will be welcomed:

import java.io.*;
public class ArrayExample 
{
   static BufferedReader kbRead = new BufferedReader(new InputStreamReader(System.in));
   public static void main(String[] args) throws IOException 
   {
      int numNames = getInt("Number of names? ");
      String[] names = new String[numNames];
      for (int i = 0; i < names.length; i++) 
      {
         names[i] = getString("Enter name #" + i);
      }
      for (int i = 0; i < names.length; ++i) 
      {
         System.out.println(names[i]);
      }
   }
 
   public static int getInt(String prompt) throws IOException 
   {
      System.out.print(prompt + " ");
      return Integer.parseInt(kbRead.readLine());
   }
   public static String getString(String prompt) throws IOException 
   {
      System.out.print(prompt + "The highest number is" + numNames);
      return kbRead.readLine();
   }
}

[Joanne Neal]

Tell us what the problems are - if it doesn't compile show the error messages. If it doesn't work as you expect, tell us what it is doing and why this isn't what you want it to do.

[Finbarrs Oketunji]

ArrayExample.java:26: cannot find symbol
symbol : variable numNames
location: class ArrayExample
System.out.print(prompt + "The highest number is" + numNames);

That was the error it displayed.

[fred rosenberger]

that's telling you that the jvm doesn't know what the variable 'numNames' is in the place where you are using it.

Variables in java have what is called "scope" - they are not universally available anywhere in the code.

BASICALLY, a variable's scope is the set of curly brackets where it is defined. so, taking your code...

import java.io.*;
public class ArrayExample 
{
   static BufferedReader kbRead = new BufferedReader(new InputStreamReader(System.in));
   public static void main(String[] args) throws IOException 
   {
      [B]int numNames = getInt("Number of names? ");//nuNames is DEFINED HERE[/B]
      String[] names = new String[numNames];
      for (int i = 0; i < names.length; i++) 
      {
         names[i] = getString("Enter name #" + i);
                    [B]//numNames is not automatically pass into your method[/B]
      }
      for (int i = 0; i < names.length; ++i) 
      {
         System.out.println(names[i]);
      }
   }[B]//numNames falls out of scope here[/B]
 
   public static int getInt(String prompt) throws IOException 
   {
      System.out.print(prompt + " ");
      return Integer.parseInt(kbRead.readLine());
   }
   public static String getString(String prompt) throws IOException 
   {
      System.out.print(prompt + "The highest number is" + numNames);
      [B]//numNames doesn't exist here[/B]      return kbRead.readLine();
   }
}

Since your variable is defined inside the main() method, that is the only place you can use it. You can make it a class variable, and then refer to it anywhere in the class, or you could pass it into the method.
[ December 13, 2007: Message edited by: Fred Rosenberger ]