Question

Can you help me with this code in Java???

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

int rows = 3;

int columns = 4;

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

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

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

System.out.println("Enter a value: ");

arr[i][j] = scan.nextInt();

}

}

System.out.println("The entered matrix:");

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

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

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

}

System.out.println();

}

sumColumns(columns,rows);

scan.close();

}

public static void sumColumns(int columns, int rows){

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

for(int i = 0; i < 4; ++i) {

int total=0;

for(int j = 0; j < 3; ++j) {

total += arr[j][i];

}

System.out.println("Sum of column " + i + " is " + total);

}

}

}

My output is:

The entered matrix:
9 1 2 4
2 2 8 0
3 3 3 3
Sum of column 0 is 0
Sum of column 1 is 0
Sum of column 2 is 0
Sum of column 3 is 0

The total is supposed to be the sum of the columns, but it is not changing in my for loop.

The output is supposed to be:

The entered matrix:
9 1 2 4
2 2 8 0
3 3 3 3
Sum of column 0 is 14
Sum of column 1 is 6
Sum of column 2 is 13
Sum of column 3 is 7

Answer 1

Program Screenshot:

Sample Ouput:

Program code:

import java.util.Scanner;

public class Main {

   public static void main(String[] args) {

       Scanner scan = new Scanner(System.in);

       int rows = 3;

       int columns = 4;

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

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

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

               System.out.println("Enter a value: ");

               arr[i][j] = scan.nextInt();

           }

       }

       System.out.println("The entered matrix:");

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

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

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

           }

           System.out.println();

       }

       sumColumns(columns,rows, arr);

       scan.close();

   }

   public static void sumColumns(int columns, int rows, int[][] arr){

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

           int total=0;

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

               total += arr[j][i];

           }

           System.out.println("Sum of column " + i + " is " + total);

       }

   }

}