Overload Operators

//Operator Overloading

#include<iostream>

using namespace std;

class Complex
{
public:
    int a,b;
    void input(string s)
    {
        int v1=0;
        int i=0;
        while(s[i]!='+')
        {
            v1=v1*10+s[i]-'0';
            i++;
        }
        while(s[i]==' ' || s[i]=='+'||s[i]=='i')
        {
            i++;
        }
        int v2=0;
        while(i<s.length())
        {
            v2=v2*10+s[i]-'0';
            i++;
        }
        a=v1;
        b=v2;
    }
};

Complex operator +(Complex &c1, Complex &c2){
    Complex c;
    c.a = c1.a + c2.a;
    c.b = c1.b + c2.b;
    return c;
}

ostream &operator <<(ostream &out, Complex &c1){
    out<<c1.a<<"+i"<<c1.b;
    return out;
}
int main()
{
    Complex x,y;
    string s1,s2;
    cin>>s1;
    cin>>s2;
    x.input(s1);
    y.input(s2);
    Complex z=x+y;
    cout<<z<<endl;
}