C / C++ / MFC

int nNum;
char cBytes[4];
 
cBytes[0] = (nNum >> 24) & 0xff;
cBytes[1] = (nNum >> 16) & 0xff;
cBytes[2] = (nNum >> 8) & 0xff;
cBytes[3] = nNum & 0xff;

// we have some class called c

int main()
{
  c myObject;
  myObject.a();  // the this pointer in a() below will be &myObject
  c *myPointer = new c;
  myPointer->a(); // the this pointer in a() below will point to the same object as myPointer
  c *myNullPointer = 0;
  myNullPointer->a(); // the this pointer in a() below is null, so accessing i through it will result in an access violation.
}

void c::a()
{
  // these two lines are equivalent.  When referring to a member variable in a
  // member function, there is an implicit "this->" before it.
  this->i = 1;
  i = 1;
}