Here is Overload Operators solution in c++ - https://programmingoneonone.com/hackerrank-overload-operators-solution-in-cpp.html

class Complex { private: int real; int imag;

public:
Complex(int r = 0, int i = 0)
{
    real = r;
    imag = i;

}

Complex(const string& s)
{
    int pos;
    pos = s.find('i');
    if(pos!= string::npos)
    {
        real = stoi(s.substr(0,pos-1));
        imag = stoi(s.substr(pos+1));
        if(s[pos-1] == '-')
        {
            imag = - imag;
        }
    }
}

Complex operator + (Complex const & Obj)
{
    Complex res;
    res.real = real + Obj.real;
    res.imag = imag + Obj.imag;
    return res;
}

void print() { cout << real << "+i" << imag << '\n'; }

}; int main() {

string s1, s2;
cin >> s1>>s2;

Complex c1(s1);
Complex c2(s2);

Complex c3 = c1 + c2;

c3.print();

return 0;

}

include

include

using namespace std;

class Complex { public: int a, b; friend ostream& operator << (ostream& os, Complex obj); friend Complex operator + (Complex& a_obj, Complex& b_obj); };

ostream& operator << (ostream& os, Complex obj) { os << obj.a << "+i" << obj.b; return os; }

Complex operator + (Complex& a_obj, Complex& b_obj) { Complex c_obj; c_obj.a = a_obj.a + b_obj.a; c_obj.b = a_obj.b + b_obj.b; return c_obj; }

void call_complex(string& s, int& a, int& b) { int num = 0; int i = 1; for (auto x : s) { if (x == '+') { continue; } else if (x == 'i') { a = num; num = 0; i = 1; continue; } num = num * i + (x - 48); i = 10; } b = num; }

int main() {

int a, b;
string s;

getline(cin, s);
call_complex(s, a, b);

Complex obj1{a, b};

getline(cin, s);
call_complex(s, a, b);

Complex obj2{a, b};

Complex obj3 = obj1 + obj2;
cout << obj3 << endl;

return 0;

}

include

include

include

include

include

using namespace std;

class complex { private: int real; int img;

public:


  void setReal(int r);
  void setImg(int i);
  int getReal();
  int getImg();

  complex operator+(complex c)
  {
    complex temp;
    temp.real=real+c.real;
    temp.img=img+c.img;
    return temp;
  }

friend ostream & operator<<(ostream & out,complex c);  
friend istream & operator>>(istream & in,complex &c);  

};

int main() { complex c1,c2,c3; cin>>c1; cin>>c2;

   c3=c1+c2;
   cout<<c3;

return 0;

} void complex::setReal(int r){real=r;} void complex::setImg(int i){img=i;} int complex::getReal(){return real;} int complex::getImg(){return img;} ostream & operator<<(ostream & out,complex c) { out<>(istream & in,complex &c) { in>>c.real; in.ignore(1,'+'); in.ignore(1,'i'); in>>c.img;

return in;

}