Question

Write a java program that displays the sum of the elements in Column x of a 2D array (careful with rows of different lengths!)

Answer 1

CODE:-

import java.util.*;

public class HomeworkLib {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

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

        int rows = sc.nextInt(); // taking the number of rows and columns from the user

        int columns = sc.nextInt();

        int data[][] = new int[rows][columns];

        System.out.println("Enter the data:- ");

        for (int i = 0; i < rows; i++) { // now taking the data from the user

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

                data[i][j] = sc.nextInt();

            }

        }

        System.out.print("Enter the value of columns you want the sum of: ");

        int x = sc.nextInt(); // taking the value of x

        int sum = 0;

        for (int i = 0; i < rows; i++) { // priting the data of the array

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

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

            }

            System.out.println();

        }

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

            sum += data[i][x - 1]; // calculating the sum of the array of that column

            // by keeping the value of the column fixed

        }

        System.out.println(sum);

    }

}

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