Pointer example

#include<iostream>
#include <cmath>
using std::cin;
using std::cout;
using std::endl;

void doSomethingElsePointer(int* i);
void doSomethingElse(int i);
void doRef(int &i);
void array_pointer();

int main() { 

int i = 100;
    int *p = &i;
    doSomethingElse(i);  // passes i by references since doSomethingElse() receives it
                         // by reference, but the syntax makes it appear as if i is passed
                         // by value
                       
    cout << "doSomethingElse=" << i << endl;       
             
    doSomethingElsePointer(&i);
    doSomethingElsePointer(p);
    cout << "-----doSomethingElsePointer=" << i << endl; 
   
    doRef(i);
cout << "-----doRef after =" << i << endl;


array_pointer();


return 0;
}

void array_pointer()  // receives i as a reference
{
/////////////////////////////
int numbers[5];
  int * p;
  p = numbers; *p = 10;
  p++; *p = 20;
  p = &numbers[2];  *p = 30;
  p = numbers + 3;  *p = 40;
  p = numbers;  *(p+4) = 50;
  for (int n=0; n<5; n++)
    cout << numbers[n] << ", ";

}


void doSomethingElse(int i)  // receives i as a reference
{
i = 9;
    cout << i << endl;
}

void doSomethingElsePointer(int* i)
{
*i = 33;
    cout << "doSomethingElsePointer = "<< *i << endl;
}

void doRef(int &i)
{
i = 99;
    cout << "doRef="<<i << endl;
}