10 operator overloading ( operator+ )

//operator+

// how to do with no operator+
#include <iostream>
using namespace std;
class complex
{
private:
    int real;
    int img;
public:
    complex(int a=0 , int b=0 ){ // non parameterized or default constructor
        real = a;
        img = b;
    }
    complex add(complex x){
        complex temp; // creating new object, if no value passed defaulf it will be zero
        temp.real = real + x.real;
        temp.img = img + x.img;
        return temp;
    }
    void show(){
        cout<<real<<" + i"<<img<<endl;
    }
};
int main()
{
    complex c1(8,5) , c2(1,7);
    complex c3 = c1.add(c2); // complex c3 = c2.add(c1);
    c1.show();
    c2.show();
    c3.show();
    return 0;
}





// if you want to do same thing as above code has done using opertor+ see below code
#include <iostream>
using namespace std;
class complex
{
private:
    int real;
    int img;
public:
    complex(int a=0 , int b=0 ){ // non parameterized or default constructor
        real = a;
        img = b;
    }
    complex operator+(complex x){
        complex temp; // creating new object, if no value passed defaulf it will be zero
        temp.real = real + x.real;
        temp.img = img + x.img;
        return temp;
    }
    void show(){
        cout<<real<<" + i"<<img<<endl;
    }
};
int main()
{
    complex c1(8,5) , c2(1,7);
    complex c3 = c1 + c2;
    c1.show();
    c2.show();
    c3.show();
    return 0;
}







// same operator+ but with friend function
#include <iostream>
using namespace std;
class complex
{
private:
    int real;
    int img;
public:
    complex(int a=0 , int b=0 ){ // non parameterized or default constructor
        real = a;
        img = b;
    }
    friend complex operator+(complex x , complex y);
    void show(){
        cout<<real<<" + i"<<img<<endl;
    }
};
complex operator+(complex x , complex y){
    complex temp;     // creating new object, if no value passed defaulf it will be zero
    temp.real = x.real + y.real;
    temp.img = x.img + y.img;
    return temp;
}
int main()
{
    complex c1(8,5) , c2(1,7);
    complex c3 = c1 + c2; // complex c3 = c2.add(c1);
    c1.show();
    c2.show();
    c3.show();
    return 0;
}

/*
Output
8 + i5
1 + i7
9 + i12
*/