hello,i have a problem in my math project.

my project is to write a program that read set of element and its relation. the input data will be from text file.(Set<space>Relation).

{1,2,3} {(1,1),(2,2),(3,3),(1,2),(1,3),(2,3)}

i have no problem reading text file into the program but im stuck when i want to try to put the relation into the two dimension array.

for example

{(1,1),(2,2),(3,3),(1,2),(1,3),(2,3)}

the two dimension array have to be like this.

col[0][1][2]
[0] 1  1  1
[1]    1  1
[2]       1

i don't know how to set one into two dimension array because there are various relation in the text file.

does anyone knows how to solve this problem?

please,help me..

thanks~

Edited 4 Years Ago by shasha56959

stuck when i want to try to put the relation into the two dimension array.

Can you define what a "relation" is and how it's value is put into the array? You need to explain what goes into each row and column of the 2D array.

As far as I can see...
Your 2d array looks like
int[][] rel = new int[3][3];
then for each relation (i, j) you set the corresponding element to 1
rel[i][j] = 1;

The size of the array depends on the number of elements in the set, and you have to convert the elements of the set into 0-(n-1) array index values. Maybe the array should be boolean[][] and you set the value to true where there is a relation?

this is my coding.

import javax.swing.*;
import java.util.ArrayList;
import java.io.*;
import java.util.StringTokenizer;
import java.lang.*;
import java.util.*;

public class tests 
{
    public static int s1[][];
    public static int s2[][];
    public static int s3[][];
    public static int s4[][];
    public static int s5[][];
    public static int s6[][];
    public static int s7[][];
    public static int s8[][];
    public static int s9[][];
    public static int s10[][];

    public static void main(String[] args) throws IOException, FileNotFoundException
    {
        BufferedReader infile = null; 

        ArrayList arr1 = new ArrayList();
        ArrayList arr2 = new ArrayList(); 
        ArrayList arr3 = new ArrayList();
        ArrayList arr4 = new ArrayList();
        try
        {
              infile = new BufferedReader (new FileReader ("numbers.txt"));

              String indata = null;

              while ((indata = infile.readLine())!= null) 
              {
                     StringTokenizer st = new StringTokenizer(indata," ");
                     String set = st.nextToken();
                     arr1.add(set);
                     String relation = st.nextToken();
                     arr2.add(relation);
              } 

              for(int i =0; i < arr2.size(); i++)
              {
                  String r = arr2.get(i).toString();
                  String result = r.replaceAll("[{}(),; ]", "");
                  arr3.add(result);
              }

              for(int i = 0; i < arr3.size(); i++)
              {
                  System.out.println(arr3.get(i).toString());
              }

              for(int i =0; i < arr1.size(); i++)
              {
                  String s = arr1.get(i).toString();
                  String result = s.replaceAll("[{}(),; ]", "");
                  arr4.add(result);  
              }

              int set1 = Integer.parseInt(arr4.get(0).toString());
              String ss1 = arr4.get(0).toString();
              int a = ss1.length();
              s1 = new int[a][a];
              int sA[][];

              char arrA;
              char indOdd=' ',indEven=' ';

                 char[] cArr = arr3.get(0).toString().toCharArray();
                 //System.out.println(arr3.get(0).toString().length());
                 int l = arr3.get(0).toString().length();
                 int arr10[][] = new int[(l/2)][2];

                    for(int i=0;i< 2;i++)
                    {
                        for(int row = 0; row < (l/2);row++)
                        {
                            for(int gh = 0;gh < l;gh++)
                            {
                                if(i%2==0)
                                {
                                indEven = cArr[gh];
                                System.out.println(indEven);
                                arr10[row][i] = indEven;
                                //System.out.println(arr10[row][i]);
                                //row++;
                            }
                            else
                            {
                                indOdd = cArr[gh+1];
                                System.out.println(indOdd);
                                arr10[row][i] = indOdd;
                                //row++;
                            }
                         }
                        }
                    }  




        }
        catch (FileNotFoundException fnfe)
        {
               System.out.println("File not found");
        }
        catch (IOException ioe)
        {
               System.out.println(ioe.getMessage());
        }
        catch (Exception e)
        {
               System.out.println(e.getMessage());
        }

        infile.close();


    }
}

i hope anyone understands it and can solve my problem.~

You need to explain what the problem is. Show the program's output, explain what is wrong with it and show what the output should be.

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