Java Program to calculate the sum of rows and columns in a matrix

              Matrix is a mathematical structure which consists of rows and columns. When you want to add the values of rows  and columns separately , follow the steps given below.

• First, get the number of rows and columns from the user.
• Initialise a new matrix with user’s rows and columns value.
• Using a for loop, read the input for the matrix.
• For calculating the sum of rows, use a for loop. Keep the row, navigate all column values and add the values. Do this for each row.
• To make the sum of column values, keep the column, iterate the row values and add the value. Continue for all columns.
• Finally, print the value.

Program:

import java.util.Scanner;

public class mRowColSum {

    public static void main(String[] args) {

        Scanner s1 = new Scanner(System.in);

       // get the matrix dimensions values

        System.out.print("Enter the number of rows: ");

        int row = s1.nextInt();

        System.out.print("Enter the number of columns: ");

        int col = s1.nextInt();

        int[][] matrix1 = new int[row][col];

        // read the matrix elements from the user

        System.out.println("Enter the matrix elements:");

        for (int i = 0; i < row; i++) {

            for (int j = 0; j < col; j++) {

                matrix1[i][j] = s1.nextInt();

            }

        }

      //Print the matrix

       System.out.println("The Matrix is :");

       for (int i = 0; i < row; i++) {

            for (int j = 0; j < col; j++) {

                System.out.print(matrix1[i][j] + " ");

            }

            System.out.println(" ");

        }

        // Calculation part and display the sum of rows value

        System.out.println("Sum of rows calculation:");

        for (int i = 0; i < row; i++) {

            int rowSum1 = 0;

            for (int j = 0; j < col; j++) {

                rowSum1 += matrix1[i][j];

            }

            System.out.println("Row " + (i + 1) + ": " + rowSum1);

        }

        // Calculation and display sum of columns value

        System.out.println("Sum of the columns:");

        for (int j = 0; j < col; j++) {

            int colSum1 = 0;

            for (int i = 0; i < row; i++) {

                colSum1 += matrix1[i][j];

            }

            System.out.println("Column " + (j + 1) + ": " + colSum1);

        }

        s1.close();

    }

}

Output:

C:\raji\blog>javac mRowColSum.java

C:\raji\blog>java mRowColSum

Enter the number of rows: 3

Enter the number of columns: 3

Enter the matrix elements:

1

1

2

3

4

5

6

7

8

The Matrix is :

1 1 2

3 4 5

6 7 8

Sum of rows calculation:

Row 1: 4

Row 2: 12

Row 3: 21

Sum of the columns:

Column 1: 10

Column 2: 12

Column 3: 15

That’s the java program to find the sum of rows and columns was written and executed successfully. Hope this code is useful to you. Keep Coding!!!!