Sum of all even elements from an Array

    #include <iostream>
    using namespace std;

    class evensum
    {
    public:
        void setnum(int n)
        {
            number =n;
        }
        protected: int number;

    };

class findsum: public evensum
{
public:
    void getsum()
    {
    int temp,i,a[100],sum=0;
    temp=number;
    cout<<"Enter "<<temp<< " numbers:  ";
    for(i=0;i<temp; i++)
    {
    cin>>a[i];
    }
    for (i=0;i<temp;i++)
    {
    if (a[i]%2==0)
    {
    sum+=a[i];
    }
    }
    cout<<"Sum of even numbers is : "<<sum<<endl;
    }
};
    int  main()
    {
    findsum es;
    int n;
    cout<<"Enter size of array: ";
    cin>>n;
    es.setnum(n);
    es.getsum();
    return 0;
    }