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

[struntz]

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

#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:

//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!

[Vlatko]

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!

[struntz]

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!

[Vlatko]

This code works

#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;
}

[Vlatko]

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.

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

Also

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.

[parksie]

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.