cpp_reference_n_pointers.cpp

#include <iostream>

void func (int n, int &nA) {
  std::cout << "void func (int n, int &nA) {\n";
  std::cout << "----------------------------\n";
  std::cout << "n  " << n << "\n";
  std::cout << "&n " << &n << "\n";
  std::cout << "nA  " << nA << "\n";
  std::cout << "&nA " << &nA << "\n";
  std::cout << "\n";
}

int main() {
  int num = 200;

  std::cout << "int num = 200;\n";
  std::cout << "--------------\n";
  std::cout << "num  " << num << "\n";
  std::cout << "&num " << &num << "\n";
  std::cout << "\n";

  int &numA = num;

  std::cout << "int &numA = num;     <-- alias, exactly the same as 'num'\n";
  std::cout << "----------------\n";
  std::cout << "numA  " << numA << "\n";
  std::cout << "&numA " << &numA << "\n";
  std::cout << "\n";

  int *numP = &num;

  std::cout << "int *numP = &num;    <-- pointer\n";
  std::cout << "-----------------\n";
  std::cout << "numP  " << numP << "\n";
  std::cout << "&numP " << &numP << " <-- address of where the pointer variable itself is stored\n";
  std::cout << "*numP " << *numP << "            <-- dereferenced pointer\n";
  std::cout << "\n";

  std::cout << "func(num, num);\n";
  func(num, num); 

}