Functions that cannot be overloaded in C++

Question

Member function declarations with the same name and the name parameter-type-list cannot be overloaded if any of them is a static member function declaration. For example, following program fails in compilation.

#include<iostream> 
class Test { 
   static void fun(int i) {} 
   void fun(int i) {}    
}; 
  
int main() 
{ 
   Test t; 
   getchar(); 
   return 0; 
} 

I don't understand why the following example can run:

#include<iostream> 
class Test {
public:
    static void fun(double i) {
        std::cout << i << "\n";
    }

    void fun(int i) {
        std::cout << i;
    }
};

int main()
{
    Test t;
    t.fun(5.5);
    t.fun(4);
    return 0;
}

Answer 1

The second Example will run because the parameter types are different in both the function, ie double in the first and int in second. So function overloading takes place

Answer 2

Function overloading only works when you have different set of parameters, in the example's case it's int and double. change the parameter data type.