boundary vs core, Java

boundary vs core

import java.util.*;
class Rextester
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("enter the number of rows and columns");
        int r=sc.nextInt();
        int c=sc.nextInt();
        System.out.println("enter 1 for sum of boundary elements and 2 for sum of core elements");
        int ch=sc.nextInt();
        int arr[][]=new int[r][c];
        int i,j,cr=0,bd=0;
        for(i=0; i<r; i++)
        {
            for(j=0; j<c; j++)
            {
                System.out.println("Enter a number");
                arr[i][j]=sc.nextInt();
            }
        }
             for(i=0; i<r; i++)
        {
            for(j=0; j<c; j++)
            {
                System.out.print(arr[i][j]+" ");
               
            }
            System.out.println();
        }
        for(i=0; i<r; i++)
        {
            for(j=0; j<c; j++)
            {
                if((i>0 && i<(r-1)) && (j!=0 && (j!=c-1)))
                {
                    cr+=arr[i][j];
                }
                else
                {
                    bd+=arr[i][j];
                }
            }
        }
        if(ch==1)
        System.out.println("Sum of boundary elements is equal to "+bd);
        else 
        System.out.println("Sum of core elemnts is equal to "+cr);
    }
}


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