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getch() is provided from conio.h so therefor you have to include conio.h in your header like this.

Code:

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

using namespace std; 
//the rest of your program

ALthough I want to point out that getch is a non portable C function and everything else in your code looks to be C++. It is a better practice to pick one languish and then stick to that. Replace getch with cin.getline(); or some other appropriate C++ method and your code will be more concistant.

it works!!! at last - thanks all! :-)