Home Class XII (ISC) Wondrous square program: ISC practical 2005 program

Wondrous square program: ISC practical 2005 program

Trushna Tejwani

January 12, 2020

5781

A wondrous square is an n by n grid which fulfills the following conditions:(i) It contains integers from 1 to n², where each integer appears only once.(ii) The sum of integers in any row or column must add up to 0.5 x n x (n² + 1).
For example the following grid is a wondrous square where the sum of each row or column is 34 when n = 4:

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17 24 1 8 15

23 5 7 14 16

4 6 13 20 22

10 12 19 21 3

11 18 25 2 9

Write a program to read n (2 < n < 10) and the values stored in these n by n cells and output if the grid represents a wondrous square or not.

Also output all the prime numbers in the grid along with their row index and column index as shown in the output. A natural number is said to be prime if it has exactly two divisors. E.g. 2,3,5,7,11 ………..

The first element of the given grid i.e 17 is stored at row index 0 and column index 0 and the next element in the row i.e. 24 is stored at row index 0 and column index 1.

Test your program for the following data and some random data.

SAMPLE DATA:

INPUT:

N = 4

16 15 1 2

6 4 10 14

9 8 12 5

3 7 11 13

OUTPUT:

YES IT REPRESENTS A WONDROUS SQUARE.

PRIME ROW INDEX COLUMN INDEX

2 0 3

3 3 0

5 2 3

7 3 1

11 3 2

13 3 3

15 0 1

INPUT:

N = 3

1 2 4

3 7 5

8 9 6

OUTPUT:

NOT A WONDROUS SQUARE.

PRIME ROW INDEX COLUMN INDEX

2 0 1

3 1 0

5 1 2

7 1 1

INPUT:

N = 2

2 3

3 2

OUTPUT:

NOT A WONDROUS SQUARE.

PRIME ROW INDEX COLUMN INDEX

2 0 0

2 1 1

import java.io.*;
public class wondrous
{
    public static void main()throws IOException
    {
        BufferedReader br=new BufferedReader(new 
        InputStreamReader(System.in));
        System.out.println("enter the number of rows and colomn");
        int n=Integer.parseInt(br.readLine());
        System.out.println("enter the numbers");
        int arr[][]=new int[n][n];
        for(int i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
            {
                arr[i][j]=Integer.parseInt(br.readLine());
            }
        }
        int r[]=new int[n];
        int c[]=new int[n];
        int co=0;
        int x=(n/2)*((n*n)+1);
        for(int i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
            {
                r[j]=arr[i][j];
                c[j]=arr[j][i];
            }
            if(sumr(r)!=x && sumc(c)!=x)
            {
                System.out.println("not wondrous");
                break;
            }         
            co++;
        }
        if(co==n)
        {
           System.out.println("wondrous"); 
        }
        System.out.println("prime \t row \t column");
        for(int i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
            {
                if(prime(arr[i][j])==1)
                {
                    System.out.println(arr[i][j]+"\t"+i+"\t"+j+"\t");
                }
            }
        }
    }
    public static int sumr(int arr[])
    {
        int s=0;
        for(int i=0;i<arr.length;i++)
        {
            s+=arr[i];
        }
        return s;
    }
     public static int sumc(int arr[])
    {
        int s=0;
        for(int i=0;i<arr.length;i++)
        {
            s+=arr[i];
        }
        return s;
    }              
    public static int prime(int n)
    {
        int h=0;
        for(int i=1;i<=n;i++)
        {
            if(n%i==0)
            {
                h++;
            }
        }
        if(h==2)
        {
            return 1;
        }
        else
        {
            return 0;
        }
    }
}