Negative interger.


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Thread: Negative interger.

  1. #1
    Join Date
    Oct 2004
    Posts
    12

    Negative interger.

    This is the actual problem that I am solving.
    ________________________________________________________________

    Write a program that takes 10 integers as input. The program places the even integers into an array called evenLIst, the odd integers into an array called oddList, and the negative integers into an array called negativeList. The program displays the contents of the three arrays after all of the integers have been entered.

    _________________________________________________________________

    After I insert a negative integer, it places it under negative only. For an example, if I input -10, it only places it in the negativeList. But I want it to also put it in the evenList, hence it's negative and positive.

    Here is my source code -----
    <code>
    import java.util.Scanner;
    public class project8_1 {
    public static Scanner scan = new Scanner(System.in);
    public static void main(String[] args) {
    int even=0, odd=0, negative=0;
    int evenList[] = new int[9];
    int oddList[] = new int[9];
    int negativeList[] = new int[9];
    int count=0;
    boolean valid = true;
    for(count=0; count<10; count=count+1){
    System.out.print("Enter an integer:");
    valid = scan.hasNextInt();
    while (valid==false){
    System.out.println("Your entry was not a valid integer, please try again:");
    scan.nextLine();
    valid=scan.hasNextInt();
    }
    int x = scan.nextInt();
    if (x<0){negativeList[negative]=x; negative=negative+1;}
    if (x>=0 && x%2==0){evenList[even]=x; even=even+1;}
    if (x>=0 && x%2==1){oddList[odd]=x; odd=odd+1;}
    }
    count=0;
    System.out.println("Negative Numbers:");
    while(count<negative){System.out.println(negativeList[count]+" "); count=count+1;}
    count=0;
    System.out.println("Even Numbers:");
    while(count<even){System.out.println(evenList[count]+" "); count=count+1;}
    count=0;
    System.out.println("Odd Numbers:");
    while(count<odd){System.out.println(oddList[count]+" "); count=count+1;}

    }
    }
    </code>

  2. #2
    Join Date
    Nov 2004
    Location
    Norway
    Posts
    1,560

    Modulus operator is not an implicit abs...

    Like:

    int x=-7;
    int y=x%2; // <--- y is now -1

    you should do like:
    Code:
    if (x < 0) negativeList[negative++] = x;
    if (x % 2 == 0) evenList[even++] = x;
    if (Math.abs(x % 2) == 1) oddList[odd++] = x;
    PS: the code tag is w. brackets ('[' and ']'), not the '<' and '>'
    eschew obfuscation

  3. #3
    Join Date
    Jan 2005
    Posts
    38

    Solution

    This my Code you can use it or take the idea from it>>>
    Code:
    import java.util.*;
    import java.io.*;
    public class Sep
    {
    	public static void main(String[]args) throws IOException
    	{
    		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
    		ArrayList all = new ArrayList();
    		ArrayList evenList = new ArrayList();
    		ArrayList oddList = new ArrayList();
    		ArrayList negList = new ArrayList();
    		for(int i=0;i<10;i++)
    		{
    			System.out.print("Enter an integer: ");
    			int entered = Integer.parseInt(stdin.readLine());
    			all.add(new Integer(entered));
    		}
    		
    		for (int i=0;i<all.size();i++)
    		{
    			Integer num = (Integer)all.get(i);
    			int number = num.intValue();
    			if (number<0&&number%2==0)
    			{
    				evenList.add(new Integer(number));
    				negList.add(new Integer(number));
    			}
    			
    			else if (number<0&&number%2!=0)
    			{
    				oddList.add(new Integer(number));
    				negList.add(new Integer(number));
    			}
    			
    			else if (number>0&&number%2==0)
    			{
    				evenList.add(new Integer(number));
    			}
    			
    			else if (number>0&&number%2!=0)
    			{
    				oddList.add(new Integer(number));
    			}
    		}
    		
    		System.out.println("The Negative List: "+negList);
    		System.out.println("The Odd List: "+oddList);
    		System.out.println("The Even List: "+evenList);
    	}
    }


    Try it then Tell me the Result>>>
    txt file is in attachment...
    Attached Files Attached Files

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