[Dev-C++] Please help me...why doesn't the code compile?

[Jose S. <dyo...@ho...>]

Please help me anyone... :-)
There are actually three files here; main.cpp, module1.cpp, and main.cpp. 
I'm trying to separate the function prototypes into a header file, and put 
the function body in a source file, since the function is generic enough to 
be used in many programs, and I want to make it into a module, but it 
doesn't compile... :-(
THANK YOU in advance!!!



//////////////////////////////////////////////////////
//  Module  : main.cpp
//
//  Purpose : Shows the usage of modular functions
//////////////////////////////////////////////////////

#include <iostream.h>
#include "module1.h"

void main()
{
   cout << "This is a test\n";
   cout << UCase("This is a test of UCase\n");
   cout << LCase("This is a test of LCase\n");
}

//////////////////////////////////////////////////////
//  Module  : module1.cpp
//
//  Purpose : Shows the usage of modular functions
//////////////////////////////////////////////////////

#include "module1.h"

//////////////////////////////////////////////////////
//  UCase()

char* UCase(char *str)
{
   // Convert each char in the string to uppercase
   //
   int len = strlen(str);
   for (int i = 0; i < len; i++)
      str[i] = toupper(str[i]);

   return str;
}

//////////////////////////////////////////////////////
//  LCase()

char* LCase(char *str)
{
   // Convert each char in the string to lowercase
   //
   int len = strlen(str);
   for (int i = 0; i < len; i++)
      str[i] = tolower(str[i]);

   return str;
}

//////////////////////////////////////////////////////
//  Module  : module1.h
//
//  Purpose : Interface for module1.cpp
//////////////////////////////////////////////////////

#ifndef __MODULE1_H__
#define __MODULE1_H__

#include <stdlib.h>
#include <ctype.h>
#include <string.h>

// Function prototypes
//
extern char* LCase(char *str);
extern char* UCase(char *str);

#endif //__MODULE1_H__

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