Summing up an Array: Error

[Thecal]

Thanks for viewing my post. I am writing a program that reads an input file into an array. The next step is for me to sum up the values of the elements of the array. I understand the concept and the logic, however I get an error.

int monthSum(double sales[][MONTHS])
{
    int sum = 0;

    for(int i = 0; i < MONTHS; i++){
        sum += sales[i]
    }
}

The error is: invalid conversion from double to int. And I get it, I cant set an int type to a double. How can I get around this? the double sales array needs to stay double because it is a const double in a different function.

When I set sum to type double, I then get the error: invalid operands of types double and double to binary operator+


Any help is appreciated. Thanks!

[Ramses12]

It's not a double to int conversion problem. It's a double* to int conversion problem. Your function's parameter is a 2-dimensional array, and (assuming MONTHS is a constant), sales[i] is a 1-dimensional array. You need to specify which array index you want to add up to the sum:

sum+=sales[<something here>][i];

[AbstractionAnon]

The problem here is that you're declaring sales to be doubly subscripted, but when you reference it at line 6, you're only using a single subscript.

The second problem is you never return sum and it's value will be lost.

Both the type of the function and sum should be double.

[Thecal]

You need to specify which array index you want to add up to the sum:

sum+=sales[<something here>][i];

Is the "something here" a specific element? If so, I need all the elements in that specific column.

[Ramses12]

As in, the sum of all elements there?
You'll need to iterate over that one too in that case.