Question

I have to make a recursive function that will compute the sum of the first n integer in an array of at least n integers. I believe I have the function complete the cout statement however is causing an error. Any help would be appreciated.

#include <iostream>
using namespace std;

int n = 0;
int array[];

int sum(int array[], int n);

int main()
{
    cout << sum(array, 4)<< endl;
    return 0;
}//end main

int sum(int array[], int n)
{
    if(n <= 0) 
    {
        return 0;
    }

    else
    {
        return array[0] + sum(array + 1, n-1);
    }
}// end Compute

Here is the error:

fatal error LNK1120: 1 unresolved externals

Answer 1

Your variable array is never defined anywhere and int array[]; is not valid syntax (but for some reason your compiler is treating it as an extern declaration or something). Change the invalid syntax to define it:

int array[] = { 1, 2, 3, 4 }; // for example