Need help w/simple program

Could you please tell me what I am doing wrong? I am trying to overload the + operator, and output the sum of the 5 numbers (a, b, c, d, e).

Code:

---


#include <iostream.h>
#include <math.h>

class BigInteger{
private:
       
public:
        double a, b, c, d, e;
        void initial();
        //sum(BigInteger &one, BigInteger &two);
        friend BigInteger operator+(BigInteger);
};

void BigInteger::initial()
{
        cout << "Please enter 5 integers: " ;
        cin >> a >> b >> c >> d >> e;
}

BigInteger operator+(BigInteger &num)
{
        //BigInteger num;
        num = ;        // what do I put here???
        return num;
}

int main()
{
        BigInteger one, two;
        one.initial();
       
        cout << one.a << one.b << one.c << one.d << one.e <<endl;
       
        return 0;

}

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Code:

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BigInteger operator+(BigInteger &num)
{
        //BigInteger num;
        num = ;        // what do I put here???
        return num;
}

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Well it´s up to you to deside! What du you want it do when you add???

I would guess that you want to add all data-members in the class and return the result. One solution may be

Code:

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BigInteger operator+(BigInteger &num)
{
                BigInteger result_of_addition;
                result_of_addition.a = a + num.a;
                result_of_addition.b = b + num.b;
                result_of_addition.c = c + num.c;
                result_of_addition.d = d + num.d;
                result_of_addition.e = e + num.e;
        return result_of_addition;
}

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Your question isn´t easy to answer, but if you describe it more in detail it certainly would be easier for me to help you.

Thanks Ripper....I want to enter 5 integers (a thru e), then add them together and print the result.

Code:

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//...
BigInteger BigInteger :: operator++() { //changed from friend function to member function
return a+b+c+d+e;
}
//...
int main() {
BigInteger ob1;
ob1.initial();
cout<<++ob1;
return 0;
}

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The above may be wrong cos im incompetent :p
Well I tried.

Code:

---

...
BigInteger BigInteger :: operator++() { //changed from friend function to member function
return a+b+c+d+e;
}
...

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hmmm well it depends again how you want it to behave. For instance if I would overload the ++ operator I would try it to mimic the built in types. My version would go something like this

Code:

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const BigInteger & BigInteger :: operator++()
{
a++; b++; c++; d++; e++;
return *this;
}

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This would increment the data-members by one and return a const refernce (more efficient then returing a copy of it). Now it is possible to e.i

Code:

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...
BigInteger one, two;
one.initial();
two = ++one;
...

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Also I would encourage you to use the constructor insteed of your initial member-function. The constructor is there so you can initialize the data-members.