Question

program to find sum of boundary elements of matrix

Matrix  = [9, 8, 7]
          [6, 5, 4]
          [3, 2, 1]

SUM OF BOUNDARY ELEMENTS OF MATRIX:40

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Code

Java

Python

Java

import java.util.Scanner;
public class sumOfBoundaryElementsOfMatrix
{
    public static void main(String[] args)
    {
        int row=0,col=0,i=0,j=0,sum=0;
        int a[][];


        Scanner sc=new Scanner(System.in);
        System.out.println("ENTER THE NUMBER OF ROW OF MATRIX");
        row=sc.nextInt();
        System.out.println("ENTER THE NUMBER OF COLUMN OF MATRIX");
        col=sc.nextInt();

        a=new int[row][col];
        System.out.println("ENTER THE ELEMENTS IN MATRIX");
        for(i=0;i< row;i++)
        {
            for(j=0;j< col;j++)
            {
                a[i][j]=sc.nextInt();
            }
        }

        System.out.println("MATRIX:");
        for(i=0;i< row;i++)
        {
            for(j=0;j< col;j++)
            {
                System.out.print(a[i][j]+" ");
            }
            System.out.println();
        }

        for(i=0;i< row;i++)
        {
            for(j=0;j< col;j++)
            {
                if(i==0 ||j==0||i==(row-1)||j==(col-1))
                {
                    sum=sum+a[i][j];

                }
            }
        }
        System.out.println("Sum of boundary elements of Matrix:"+sum);
    }
}

Python

import numpy as np
row=int(input("Enter number of rows:"))
columns=int(input("Enter number of columns:"))
matrix=np.empty([row,columns],dtype=np.int)
# Taking input from user
print("Enter elements in matrix:")
for i in range(0,row):
    for j in range(0,columns):
        print("(",(i+1),",",(j+1),")",":",end="")
        matrix[i,j]=int(input())
#printing the matrix
print("Matrix:")
for i in range(0, row):
    print(matrix[i])

#calculating sum of boundary elements
boundaryElementsSum=0
for i in range(0,row):
    for j in range(0,columns):
        if(i==0 or j==0 or i==(row-1) or j==(columns-1)):
            boundaryElementsSum=boundaryElementsSum+matrix[i,j]
print("Sum of boundary elements of Matrix:",boundaryElementsSum)