#include <iostream>
using namespace std;

void functionOne(double* theParameter)
{
     
     double value = *theParameter;
     theParameter = new double;
     *theParameter = 10;
     // this function additionally creates a memroy leak
     // because we'll lose handle to new double when function 
     // terminates
}

void functionTwo(double* & theParameter)
{
     double value = *theParameter;
     theParameter = new double;
     *theParameter = 10;
}


int main(int argc, char* argv[])
{
     double aDouble = 5.0;
     double* aDoublePointer = &aDouble;

     cout << "Value of aDouble: " << aDouble << endl;
     cout << "Memory address of aDouble: " << &aDouble << endl;
     cout << "Value of aDoublePointer: " << aDoublePointer << endl;
     cout << "Value held in address pointed to by aDoublePointer: " << *aDoublePointer << endl << endl;

     functionOne(aDoublePointer);
     cout << "After calling functionOne: " << endl;
     cout << "Value of aDouble: " << aDouble << endl;
     cout << "Memory address of aDouble: " << &aDouble << endl;
     cout << "Value of aDoublePointer: " << aDoublePointer << endl;
     cout << "Value held in address pointed to by aDoublePointer: " << *aDoublePointer << endl << endl;

     functionTwo(aDoublePointer);
     cout << "After calling functionTwo: " << endl;
     cout << "Value of aDouble: " << aDouble << endl;
     cout << "Memory address of aDouble: " << &aDouble << endl;
     cout << "Value of aDoublePointer: " << aDoublePointer << endl;
     cout << "Value held in address pointed to by aDoublePointer: " << *aDoublePointer << endl;
         
     return 0;
}