Making a Variable-adding function without operator +

I've just completed a function that adds two 16-bit numbers without using the + operator.
If you are interested, check out the attached file... or have a look below...

(This function has no practical use, since it is way slower than +. I just made it for fun)

Code:

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//--- Included files ---
#include <iostream.h>
#include <conio.h>


//--- Global stuff ---
bool MemBit=0;


//--- Bit adder ---
bool BitAdd(bool Bit1, bool Bit2)
{
  //Add two bits
  MemBit=(Bit1 & Bit2);
  return (!(Bit1 & Bit2) && (Bit1 | Bit2));
}


//--- Set specific byte function ---
void SetBit(unsigned short& TempNum, unsigned short Number)
{
  unsigned short AddBit=1;
  AddBit=AddBit<<Number;
  TempNum=(TempNum | AddBit);
}


//--- Full adder ---
unsigned short Add(unsigned short Num1, unsigned short Num2)
{
  //Variables
  unsigned short CompleteNumber=0;
  bool TempBit;
  bool OldMemBit;
  bool PassOnBit;

  //Adds two 16-bit numbers using BitAdd function
  TempBit=BitAdd(Num1 & 1, Num2 & 1);
  if(TempBit) SetBit(CompleteNumber, 0);
  PassOnBit=MemBit;

  TempBit=BitAdd(Num1 & 2, Num2 & 2);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 1);

  TempBit=BitAdd(Num1 & 4, Num2 & 4);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 2);

  TempBit=BitAdd(Num1 & 8, Num2 & 8);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 3);

  TempBit=BitAdd(Num1 & 16, Num2 & 16);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 4);

  TempBit=BitAdd(Num1 & 32, Num2 & 32);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 5);

  TempBit=BitAdd(Num1 & 64, Num2 & 64);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 6);

  TempBit=BitAdd(Num1 & 128, Num2 & 128);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 7);

  TempBit=BitAdd(Num1 & 256, Num2 & 256);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 8);

  TempBit=BitAdd(Num1 & 512, Num2 & 512);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 9);

  TempBit=BitAdd(Num1 & 1024, Num2 & 1024);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 10);

  TempBit=BitAdd(Num1 & 2048, Num2 & 2048);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 11);

  TempBit=BitAdd(Num1 & 4096, Num2 & 4096);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 12);

  TempBit=BitAdd(Num1 & 8192, Num2 & 8192);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 13);

  TempBit=BitAdd(Num1 & 16384, Num2 & 16384);
  OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 14);

  TempBit=BitAdd(Num1 & 32768, Num2 & 32768);
  //OldMemBit=MemBit;
  TempBit=BitAdd(TempBit, PassOnBit);
  //PassOnBit=(OldMemBit | MemBit);
  if(TempBit) SetBit(CompleteNumber, 15);

  //Return answer
  return CompleteNumber;
}


//--- Main ---             
int main()
{
  //Add numbers
  cout << "1 plus 3 is:    " << Add(1, 3) << endl;
  cout << "6 plus 14 is:    " << Add(6, 14) << endl;
  cout << "256 plus 768 is: " << Add(256, 768) << endl;
  cout << "1100 plus 11 is: " << Add(1100, 11) << endl;
  cout << "65535 plus 1 is: " << Add(65535, 1);
  cout << "\t(Data out of range, restarts from 0)" << endl;
  cout << "65535 plus 2 is: " << Add(65535, 2) << endl;
  cout << "65535 plus 9 is: " << Add(65535, 9) << endl;

  //Exit
  getch();
  return 0;
}

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