# Multidimensional user defined array question

• November 6th, 2013, 12:30 PM
tonynsx
Multidimensional user defined array question
The program below asks the user for the size of the multidimensional array and creates it. Then, I want to add the total of each rows and display it. I'm having trouble with that. My program adds the total from the previous row and add it to the current total. How can I fix this?

This is what it should look like

Code :

```How big would you like your matrix? Rows - ? 2 Cols - ? 2   Please enter your row 1? Column 1 - 1 Column 2 - 2   Please enter your row 2? Column 1 - 3 Column 2 - 4   Your total for row 1 is - 3 Your total for row 2 is - 7   Your total for the 2 x 2 matrix is 10```

This is what it looks like now

Code :

```How big would you like your matrix? Rows - ? 2 Cols - ? 2   Please enter your row 1? Column 1 - 1 Column 2 - 2   Please enter your row 2? Column 1 - 3 Column 2 - 4   Your total for row 1 is - 3 Your total for row 2 is - 10   Your total for the 2 x 2 matrix is 13```

Code :

```import java.util.Scanner;   public class ArraySum {   public static void main(String[] args) {   Scanner scan = new Scanner(System.in);   int rows, cols, colValue, rowTotal, matrixTotal;   rowTotal = 0; matrixTotal = 0;   System.out.println("How big would you like your matrix?"); System.out.print("\tRows - ? "); rows = scan.nextInt(); System.out.print("\tCols - ? "); cols = scan.nextInt();   System.out.println();   int[][] numberArray = new int[rows][cols];   for(int a=0; a<numberArray.length; a++) { System.out.println("Please enter your row " + (a+1) + "?");   for(int b=0; b<numberArray[0].length; b++) { System.out.print("\tColumn " + (b+1) + " - "); colValue = scan.nextInt();   numberArray[a][b] = colValue; }   System.out.println(); }   for(int c=0; c<numberArray.length; c++) { for(int d=0; d<numberArray[0].length; d++) { rowTotal = rowTotal + numberArray[c][d]; }   matrixTotal = matrixTotal + rowTotal;   System.out.println("Your total for row " + (c+1) + " is - " + rowTotal); }   System.out.println();   System.out.println("Your total for the " + rows + " x " + cols + " matrix is " + matrixTotal); } }```
• November 6th, 2013, 12:39 PM
GregBrannon
Re: Multidimensional user defined array question
It appears that you need to reset rowTotal to zero between trips through the nested for loop.
• November 6th, 2013, 12:49 PM
tonynsx
Re: Multidimensional user defined array question
Quote:

Originally Posted by GregBrannon
It appears that you need to reset rowTotal to zero between trips through the nested for loop.

Thank you, I didn't think about that, it works now.
• November 6th, 2013, 04:27 PM
GregBrannon
Re: Multidimensional user defined array question