Input Format
The overloaded operator + should receive two complex numbers ( and ) as parameters. It must return a single complex number.
The overloaded operator << should add "" to the stream where  is the real part and  is the imaginary part of the complex number which is then passed as a parameter to the overloaded operator.

hackerrank overload operators problem solution in c++ programming

Overload Operators problem solution in c++ programming | HackerRank

//Operator Over

#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+(const complex &A, complex &B)
{
    complex z;
    z.a = A.a + B.a;
    z.b = A.b + B.b;
    return z;
}

ostream& operator<<(ostream& out, complex z)
{
    out<<z.a<<"+i"<<z.b;
    return out;
}
//Overload operators + and << for the class complex
//+ should add two complex numbers as (a+ib) + (c+id) = (a+c) + i(b+d)
//<< should print a complex number in the format "a+ib"
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;
}