Object-Oriented Programming in C++

// PL2/max2.cpp
// overloading the max function
// Niels Walet, last updated 04/12/2019
#include<iostream>
double max(double number1, double number2)
{
  if(number1>number2) return number1; else return number2;
}
int max(int number1, int number2)
{
  if(number1>number2) return number1; else return number2;
}
int main()
{
  int integer1{1};
  int integer2{2};
  double real1{4.};
  double real2{3.};
  std::cout<<max(integer1,integer2)<<std::endl
	   <<max(real1,real2)<<std::endl;
  return 0;
}