i got an odd error in VC++ on a simple program, please help!

hello everyone, i'm new to C++, and i'm using VC++6.0 as the compiler, well here is the code...the error i get is this:
--------------------Configuration: Returning Mutli values - Win32 Debug--------------------
Linking...
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/Returning Mutli values.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

Returning Mutli values.exe - 2 error(s), 0 warning(s)
------------------------------------------------------------------
here is my code: in math.h

Code:

---

#include <iostream.h>
#include "math.cpp"

//prototype
typedef unsigned short int USHORT;

USHORT factor(USHORT, USHORT*, USHORT*);


int main()
{
        short question;
        USHORT number, squared, cubed;
       
        cout <<"Enter a number (0-20);
                cin >> question;
        //function
        number = factor(number,squared,cubed);

        if(number <= 20)
        {
                cout << "Number: " << "\n";
                        cout << "Squared: " << "\n";
                        cout << "Cubed: " << "\n";
                        {
                        else
                                cout <<"Error Number too big!" << endl;
                        }
                }
        return 0;
}

---

here is the code in math.cpp:

Code:

---

//math.cpp

//fucntion definition
typedef unsigned short int USHORT;

USHORT factor(USHORT n, USHORT*pSquared, USHORT*pCubed)
{
        if (n > 20)
                return 1; //failure, too big.
        else
        {
                *pSquared = n*n;
                *pCubed = n*n*n;
               
        }
        return 0; //success!
}

---

thanks for listening!

Make sure thet when you started your project you chose a win32 console application and not a win32 application. Your app is console and it seems that you are compiling it as a standard win32 app.
So, start a new project and choose console app. That is all! :cool:

i tried that, and thats not the problem, is there anything wrong with my code?
did i mix somthing up?
or forget a header? i can't figure it out!

This code works

Code:

---

#include <iostream.h>


//prototype
typedef unsigned short int USHORT;
USHORT Factor(USHORT, USHORT*, USHORT*);



int main()
{
        short question;
        USHORT number, squared, cubed;
       
        cout <<"Enter a number (0-20)";
                cin >> number;
                short error;
        error = Factor(number, &squared, &cubed);


        if (!error)
        {
                cout << "Number: " <<number<< "\n";
                        cout << "Squared: " <<squared<< "\n";
                        cout << "Cubed: " <<cubed <<"\n";
        }
                       
                        else
                        {
                                cout <<"Error Number too big!" << endl;
                        }
               
        return 0;
}


USHORT Factor(USHORT n, USHORT *pSquared, USHORT *pCubed)
    {
    USHORT Value = 0;
      if (n > 20)
          Value = 1;
    else
      {
        *pSquared = n*n;
          *pCubed = n*n*n;
        Value = 0;
      }
      return Value;
}

---

Code:

---

if(number <= 20)
        {
                cout << "Number: " << "\n";
                        cout << "Squared: " << "\n";
                        cout << "Cubed: " << "\n";
                        {

---

In this code cout prints just the names number,squared... You should put the variables to be printed.

Code:

---

cout << "Number: " <<number<< "\n";
cout << "Squared: " <<squared<< "\n";
cout << "Cubed: " <<cubed <<"\n";

---

Also

Code:

---

cout <<"Enter a number (0-20);
                cin >> question;
        //function
        number = factor(number,squared,cubed);

---

What role is question playing here. Nothing. You should have put it as the first argument of the function.

All your program code (IE main) needs to be in .cpp files. Definitions of function prototypes go in .h files. Make sure main is in a .cpp file.