A function that returns the sum of all negative elements within an array.

getSumNeg.cpp

#include <iostream>

using namespace std;

int getSumNeg(int a[],int a_length)
{
    int sum=0;

    for(int i=0 ; i<a_length ; i++)
    {
        if(a[i]<0)
            sum+=a[i];
    }

    return sum;
}

int main()
{
    //Initialization
    int arr_length=0;
    cout<<"Enter array length: ";
    cin>>arr_length;
    int arr[arr_length]= {0};


    //Data Entry
    for(int i=0 ; i<arr_length ; i++)
    {
        cout<<"Enter value #"<<i+1<<" : ";
        cin>>arr[i];
    }

    //Output
    cout<<"The sum of all negative values in the array is : "<< getSumNeg( arr, arr_length)<<endl;

    return 0;

}