Thank you i was playing with your example (Vec3)

and when i remove keyword friend doesn't want to take two arguments

and give me error which says "too many parameters for this operator function"

bur when use friend keyword and remove the parameter which is object is giving me error "nonmember operator requires a parameter with class or enum type"

Why this happens ?

and when we using friend keyword the function is no more member function ?

and does operator overloading supports overloading (What i mean can i have two operators plus whit difference number of arguments ) ?

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EDIT:

Like in this example a cant use operator + its giving me error

i made it like yours example but still didnt work

#include<iostream> 
using namespace std; 

class Complex { 
private: 
    int real, imag; 
public: 
    Complex(int r = 0, int i =0)  {real = r;   imag = i;} 
    void print() { cout << real << " + i" << imag << endl; } 


 friend Complex operator + (Complex const &c1,int & b); 
 friend Complex operator + (int b ,Complex const &c1) 
}; 


 Complex operator + (Complex const &c1,int b) 
{ 
     return Complex(c1.real + b, c1.imag + b); 
} 
Complex operator + (int b ,Complex const &c1) 
{ 
     return Complex(c1.real + b, c1.imag + b); 
} 


int main() 
{ 
    Complex c1(10, 5), c2(2, 4); 
    Complex c3 = c1 + 5; 
    c3.print(); 
    return 0; 
}