Summing Up A 2D Array

Question

Given my current program, I would like it to calculate the sum of each column and each row once the user has entered all their values. My current code seems to be just doubling

Answer 1

Welcome to the world of Java. First of let's dissect your "doubling the array" code.

array2d[row][column] = array2d[row][column] + array2d[row][column];

This line of code is the issue. The loops that you have applied tend to update the values of each of the elements in the matrix. For e.g. Suppose

array2d[1][2]=2

Hence the code mentioned above does this

array2d[1][2]= array2d[1][2]+array2d[1][2];

which essentially doubles the value of the array.

You should try something like this:

//To print the values of rows

    for(int i=0;i