C++ Assignment Help Please!

I have a C++ midterm due tomorrow that I can't figure out. Here is the assignment:

Code:

`// Use the program BtoDsol.cpp located at:`

BtoDSol.cpp

// which converts any byte to decimal

// enhance the driver program to test an additional function DtoB with a prototype of:

// string DtoB (int Decimal);

// DtoB will convert any decimal number <= 255 to binary

// Here is a possible partial code:

string DtoB (int Decimal)

{

string Bin ="00000000"; // declare a model binary number

// you will need to develop the rest of the code here

//

return Bin;

}

Now, the .cpp referred to, BtoDSol.cpp:

Code:

`// This program will test the function BtoD`

// int BtoD (string Binary); is the prototype

// will convert any byte (8bits) from binary to decimal

#include <iostream>

#include <string>

using namespace std;

void BaseGen(int Base[], int Size)

{

Base[0]=1; // the first element is always 1

int Index=1; // start with the second value

while(Index<Size) // must load all Base elements

{

Base[Index]=Base[Index-1]*2; // left = right *2

Index=Index+1; // Bump the Index

}

return ;

}

int BtoD(string Binary)

{

unsigned int Index=1; //loop control variable

Index=0; // Initialize to zero

int Dv=0; //Dv is the decimal value for the binary number in Binary

int Base[8]; // Base array to store binary base values

BaseGen(Base,8); // Load Base

while(Index<Binary.size()) // loop to check all bits

{

if (Binary[Index]=='1') // if the value is 1

Dv=Dv+Base[Binary.size()-1-Index]; // add the corresponding base value to Dv

Index=Index+1; // Bump the loop control variable

}

return Dv; // Return the decimal value

}

// The driver program follows

int main()

{

string Bin,Anychar;

int Decimal;

// Get the binary number

cout << " Please type any valid Binary Number of eight or less bits"<< endl;

cin>> Bin;

// Convert A to decimal

Decimal=BtoD( Bin);

cout <<" The decimal value of "<< Bin << " is = "<<Decimal<<endl;

cin >> Anychar;

return 0;

}

I have no idea what to do on this one. Any help greatly appreciated, being how my grade depends on it and all.