C++ String variables

I'm trying to make variables to hold strings of text and am getting the following errors:
Line 14: 'byte' undeclared (first use this function)
Line 14: (Each undeclared identifier is reported only once
Line 14: for each function it appears in.)
Line 18: 'byte2' undeclared (first use this function)

Here's my code:

Code:

---

#include <iostream.h>
#include <string.h>

using namespace std;

int main()
{
string byte, byte2;
char answer;
int size;
    cout<<"This program is design to convert computer memory sizes.\n";
    start:
    cout<<"What is the base byte? (b,kb,mb,gb,tb) ";
    cin>> byte;
    cout<<"How many of the base byte? ";
    cin>> size;
    cout<<"What would you like to convert it to? ";
    cin>> byte2;

    if ( byte == "b" ) {
      if ( byte2 == "kb" ) {
          cout<<"There are "<< (size/1024) <<"kilobytes in "<< size <<"bytes\n";
      }
      if ( byte2 == "mb" ) {
          cout<<"There are "<< ((size/1024)/1024) <<"megabytes in "<< size <<"bytes\n";
      }
      if ( byte2 == "gb" ) {
          cout<<"There are "<< (((size/1024)/1024)/1024) <<"gigabytes in "<< size <<"bytes\n";
      }
      if ( byte2 == "tb" ) {
          cout<<"There are "<< ((((size/1024)/1024)/1024)/1024) <<"terabytes in "<< size <<"bytes\n";
      }
    }

---

There's more to the program but I'm only posting what I think is pertinent to the problem at hand and for the sake of space.

Thanks.

Code:

---

#include <iostream> //Drop .h
#include <string> //Drop .h

using namespace std;

int main()
{
string byte, byte2;
char answer;
int size;
    cout<<"This program is design to convert computer memory sizes.\n";
    start: //What is this for?
    cout<<"What is the base byte? (b,kb,mb,gb,tb) ";
    cin>> byte;
    cout<<"How many of the base byte? ";
    cin>> size;
    cout<<"What would you like to convert it to? ";
    cin>> byte2;

    if ( byte == "b" ) {
      if ( byte2 == "kb" ) {
          cout<<"There are "<< (size/1024) <<"kilobytes in "<< size <<"bytes\n";
      }
      if ( byte2 == "mb" ) {
          cout<<"There are "<< ((size/1024)/1024) <<"megabytes in "<< size <<"bytes\n";
      }
      if ( byte2 == "gb" ) {
          cout<<"There are "<< (((size/1024)/1024)/1024) <<"gigabytes in "<< size <<"bytes\n";
      }
      if ( byte2 == "tb" ) {
          cout<<"There are "<< ((((size/1024)/1024)/1024)/1024) <<"terabytes in "<< size <<"bytes\n";
      }
    }
} //Need a closing brace for main()

---

Will 1st off he said there was more to his code. So dont worry about closing his "int main()" just yet. Ok Will I know something you could change around 1st. I put them into your code.

Code:

---

#include <iostream.h>
#include <string.h>

using namespace std;

int main()
{
string byte;
string byte2;
char answer;
int size;
    cout<<"This program is design to convert computer memory sizes.\n";
    cout<<"What is the base byte? (b,kb,mb,gb,tb) ";
    getline(cin, byte);
    cout<<"How many of the base byte? ";
    getline(cin, size);
    cout<<"What would you like to convert it to? ";
    getline(cin, byte2);

    if ( byte == "b" ) { //<~~this right here needs a cout also. Something like.
          cout<<"There are"<<(size/size)<<"something in"<<size <<"bytes\n";
      }
      else if ( byte2 == "kb" ) {
          cout<<"There are "<< (size/1024) <<"kilobytes in "<< size <<"bytes\n";
      }
      else if ( byte2 == "mb" ) {
          cout<<"There are "<< ((size/1024)/1024) <<"megabytes in "<< size <<"bytes\n";
      }
      else if ( byte2 == "gb" ) {
          cout<<"There are "<< (((size/1024)/1024)/1024) <<"gigabytes in "<< size <<"bytes\n";
      }
      else if ( byte2 == "tb" ) {
          cout<<"There are "<< ((((size/1024)/1024)/1024)/1024) <<"terabytes in "<< size <<"bytes\n";
      }

---

I hope that helps some what. Good luck.

also as SirCrono6 suggested, lose the .h on your header files..
ex

#include <iostream>
#include <string>

>> start:

are you using goto?

Thanks a lot, removing the ".h" from the header files worked, and yes I'm using goto.