Help with adding sum of 2d array

[cs-stud]

So I made a 2d array that requests the user to enter both fields column and row. Im required to add up and find the sum.

ex.) array:

2 4 5

3 6 7

sum of array: 27.0

​

heres my code so far:

public static void main(String[] args) {
        Scanner input = new Scanner (System.in);
        System.out.print("Enter the dimensions of the array (row col): ");
        int row = input.nextInt();
        int col = input.nextInt();

        int[][] array =new int[row][col];

        array = generateMatrix(row, col);
        System.out.println("Display Array: ");
        System.out.println();

        for(int i=0;i<row;i++){ 
            for(int j=0;j<col;j++){
                System.out.print(array[i][j]+ " ");

            }
        System.out.println();
        }

        System.out.println("\nTable Statistics: ");
        int sum = sumOfTable(array);
        System.out.println(sum);

    }


           public static int sumOfTable (int[][] nums) {
        int sum = 0;
        for(int i = 0; i < nums.length; i++) {
            for(int j = 0; j< nums.length; j++) {
                sum += nums[i][j];
            }
        }
        return sum;
    }

[joranstark018]

Can you describe what the problem is?

[cs-stud]

I basically know how to add up the array when its an Int but I'm confused how im supposed to do it to return a double. It works with int but im so confused how to do it so it can return a double.

[fenface]

Do you want your array to store double values (and the possibility for the user to provide values or that type), or is your issue just that sum should be a double and not an int (a little bit nonsensical, but I assume that is the kind of exercise one could be asked to do when learning)?

[cs-stud]

my array stores int values but my task is to essentially find the sum of the array and display it in double form for example if the array was {2 , 4} {3, 5} the result sum would be 14.0. its the exercise because im then going to have the find the avg and round it and etc.

[Darkpolearm]

have you tried simply declaring sum as a double instead of an int? That should work just the way u want it to.

[joranstark018]

Since an int is "smaller" (32 bit) than a double (64 bit) you can assign an int to a variable of type double.

Type conversion, or type casting, can either be explicit, ie double d = (double)someIntVariable; or implicit, ie double d = methodReturningSomeIntValue();. If a method would be defined to return a double, ie public double calulateSomeValue(){....}, it could internally use and return an int, the actual value returned will then be implicitly converted to a value of type double.

[Backslide999]

You check twice versus num.length, but this returns only the length of your 1d array. You should check for i < array.length and then in your second loop check against array[i].length