Dinamic allocate memory

#include "stdafx.h"
// Heap
// Demonstrates dynamically allocating memory
#include <iostream>
using namespace std;
int* intOnHeap(); //returns an int on the heap
void leak1(); //creates a memory leak
void leak2(); //creates another memory leak
int main()
{
    int* pHeap = new int;   //allocates memory on the heap and returns its address.
    *pHeap = 10; //Receive the value
    cout << "*pHeap: " << *pHeap << "\n\n"; //Debug the value if I use cout << pHeap it will debug the address
    cout << "pHeap: " << pHeap << "\n\n";
    int* pHeap2 = intOnHeap();
    cout << "*pHeap2: " << *pHeap2 << "\n\n";
    cout << "Freeing memory pointed to by pHeap.\n\n";
    delete pHeap;
    cout << "Freeing memory pointed to by pHeap2.\n\n";
    delete pHeap2;
    //get rid of dangling pointers
    pHeap = 0;
    pHeap2 = 0;
    return 0;
}
int* intOnHeap()
{
    int* pTemp = new int(20);
    return pTemp;
}
//Examples of how not allocate memory (causes leak)
void leak1()
{
    int* drip1 = new int(30);
}
void leak2()
{
    int* drip2 = new int(50);
    drip2 = new int(100);
    delete drip2;
}