How to make sum of columns and sum of rows method for Two-dimensional array?

Question

So far I have a method that totals the columns, but it's not exactly what I need.

I need to have the total of each row to the right of each row, and the total of each column at the bottom of each column. Something like this

1  2  3  4  =  10
3  4  5  6  =  18

4  6  8  10  < - Total

What I have now gives me the total of each column, but not under the columns.

Method

    // method to add the sum of columns
    public static int[] columnSum(int x[][]){
          int temp[] = new int[x[0].length];

            for (int i = 0; i < x[0].length; i++){
                int sum = 0;

                for (int j = 0; j < x.length; j++){
                    sum += x[j][i];

                }
                temp[i] = sum;
                System.out.println("Index is: " + i + " Sum is: "+sum);

            }

            return temp;
        }


}

Devavrata · Accepted Answer · 2014-02-19 21:27:16Z

2

This is the array
1   2   3   
2   3   4 
3   5   7

apply just one more for loop after printing the matrix.

System.out.println("This is the sum of the columns");
int temp[]=columnSum(firstarray);
for(int i=0;i<columns;i++)
{
    System.out.print(temp[i]+"\t");
 }
 System.out.println();

replace with

System.out.println("This is the sum of the columns");
columnSum(firstarray);

edited Feb 19, 2014 at 21:27

answered Feb 19, 2014 at 20:31

Devavrata

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10 Comments

user3055240 Over a year ago

So just add this one into the method? I tried doing that, but it wasn't displayed properly. I might be doing something wrong

user3055240 Over a year ago

Yes. But it didn't come out like that. I'll edit above

Devavrata Over a year ago

So paste this for loop after the code where you are printing the matrix.Not in columnSum method.

user3055240 Over a year ago

Still not displaying correctly. Would it be ok if I edited everything above and posted my entire code?

Devavrata Over a year ago

There is no problem if you enter your full code .but indent that in a good manner means should be readable clearly.

|

Smutje · Accepted Answer · 2014-02-19 20:22:12Z

0

After printing the array, just print the totals in a single line instead of three lines.

answered Feb 19, 2014 at 20:22

Smutje

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4 Comments

user3055240 Over a year ago

I'm not following. I changed println to print, but that doesn't do what I want.

Smutje Over a year ago

"but that doesn't do what I want." - and what does it?

user3055240 Over a year ago

Ok. I edited to show the output of changing to print

Smutje Over a year ago

Yes, perhaps you should omit the hint-text. You didn't print additional text when displaying the array, did you?

BaconCookies · Accepted Answer · 2014-02-19 20:42:00Z

-1

You can use a stringbuilder to append each sum to a string and then print it out after the loop is over.

StringBuilder columnTotal = new StringBuilder();

for (....){
 columnTotal.append(sum)
}

System.out.println(columnTotal)

answered Feb 19, 2014 at 20:42

BaconCookies

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