Error: Struct already definded in *.Obj - visual-c++

Question

Help, I'm using VC++ and I always get the LNK2005 and LNK1169 Error when running my script, can you guys please tell me why it's happening and how to fix it, Thank you!
Code:
In the Main.cpp
#include "stdafx.h
#include <Windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "Modifier.h"
using namespace std;
HWND myconsole = GetConsoleWindow();
HDC mydc = GetDC(myconsole);
int main()
{
if (Input.beg("Hello"))
{
cout << "World";
}
cin.ignore();
}
In "Modifier.cpp"
#include "stdafx.h"
#include <iostream>
#include <string>
#include <sstream>
using namespace std;
struct {
bool beg(string a)
{
string b;
getline(cin, b);
if (b == a)
{
return true;
}
else
{
}
}
} Input;
In "Modifier.h"
#include "Modifier.cpp"

Answer 1

You must change your header declaration: you're inadvertently declaring a different, global "Input" variable in every .cpp that includes "Modifier.h".
SUGGESTION:
// Modifier.h
#ifndef MODIFER_H
#define MODIFIER_H
struct Input {
bool beg(string a)
{
string b;
getline(cin, b);
if (b == a)
{
return true;
}
else
{
}
}
};
#endif
Then, in Modifier.cpp:
#include "Modifier.h"
struct Input globalInput;
You should not include a .cpp in a .h. You should include headers in source files, not vice versa.
And you should definitely consider using a "class" instead of a "struct". Because, frankly, that's what your "Input" is: just a method, no state/no data.