Question

We use JAVA. Thanks.   

Create an application whose main method asks the user to enter an n by m integer matrix that contains nm integer numbers. n and m should be between 1 and 10. If the user enters a  

          number less than 1 or greater than 10, the program will continue to ask the user to enter an integer number between 1 and 10. The program should print the sum of the boundary elements of the matrix. The program should use the following method to calculate the sum of the boundary elements of the matrix:

          int boundarySum(int [][] matrix):

         returns the sum of the boundary elements of the matrix.

        

          Use the Scanner class to read the user’s input.

Example 1. Input/output:

Input:

Please enter the number of rows(between 1 and 10): 3

Please enter the number of columns(between 1 and 10): 3

Please enter a 3 by 3 matrix:

5      8      1      

13    2     -5    

3      10    6    

Output:

The sum of the boundary elements is: 41

Example 2. Input/output:

Input:

    Please enter the number of rows(between 1 and 10): 5

    Please enter the number of columns(between 1 and 10): 20

    Please enter the number of columns(between 1 and 10):-6

    Please enter the number of columns(between 1 and 10):4

Please enter a 5 by 4 matrix:

5      7      7       8

12    0     -5      15

3      12    9       10

7       3     8        7

9     -10    5        6

Output:

              The sum of the boundary elements is: 91

Answer 1

/* Here is your required code */

import java.util.Scanner;
public class Main {

   public int boundarySum(int [][] matrix)
   { int m = matrix[0].length;
int n = matrix.length;
       int sum = 0;
       for (int i = 0; i < m; i++) {
           for (int j = 0; j < n; j++) {
               if (i == 0)
                   sum += matrix[i][j];
               else if (i == m - 1)
                   sum += matrix[i][j];
               else if (j == 0)
                   sum += matrix[i][j];
               else if (j == n - 1)
                   sum += matrix[i][j];
           }
       }
       return sum;
   }
   public static void main(String[] args)
   {Scanner sc=new Scanner(System.in);
   int n,m;
   Main m1=new Main();
   while(true){
   System.out.print("Please enter the number of rows(between 1 and 10):");
   n=sc.nextInt();
   if(n<1||n>10)
{
System.out.println("Please Enter number between 1 to 10");
}
else
break;
}
   while(true){
   System.out.print("Please enter the number of columns(between 1 and 10):");
   m=sc.nextInt();
   if(m<1||m>10)
{
System.out.println("Please Enter number between 1 to 10");
}
else
break;
}
   int matrix[][] = new int[n][m];
   System.out.println("Please enter a 3 by 3 matrix:");
   for(int i=0;i<n;i++)
   for(int j=0;j<m;j++)
matrix[i][j]=sc.nextInt();
       int sum = m1.boundarySum(matrix);
       System.out.println("The sum of the boundary elements is:"+sum);
   }
}