#include <iostream>
#include <fstream>
using namespace std;

const int size = 30;
char filename[size];
//char menu;
bool isNotvalidate(int);
void choose(int);

char ext[4];
char newname[size+5];
void extension(int, char ext[]);
void append(char filename[], char ext[], char newname[]);


int main()
{
	int choice;
	ifstream inputfile;

	do
	{
		cout << "What file contains your data?  ";
		cin >> filename;
		
		cout << "1]  .txt " << endl;
		cout << "2]  .dat " << endl;
		cout << "3]  .in " << endl;
		cout << "4]  .ttd " << endl;
		cout << "What is the file extension?" << endl ;
		cin >> choice;
		
	}while(isNotvalidate(choice));
	choose(choice);//SHows you the file extension you chose 
	extension(choice, ext);
	append(filename, ext, newname);
	inputfile.open(newname);// open the file given
	

	cin.ignore();
	cin.ignore();
	return 0;
}

bool isNotvalidate(int choice)
{
	if(choice < 1 || choice > 4)
		return true;
	else
		return false;
}
//char menu()
//{

//}

void choose(int choice)
{
	switch(choice)
	{
	case 1: cout << "Opening file " << filename << ".txt" << endl;
		break;
	case 2: cout << "Opening file " << filename << ".dat" << endl;
		break;
	case 3: cout << "Opening file " << filename << ".in" << endl;
		break;
	default: cout << "Opening file " << filename << ".ttd" << endl;
		break;
	}
}

void append(char filename[], char ext[], char newname[])
{				
		for(int count=0; char filename[count] != '\0'; count++)
			newname[count] = filename[count];
		for(int j=0; char ext[j] != '\0'; j++)
			newname[count] = ext[j];
		newname[count] = '\0';

}

void extension(int choice, char ext[])
{
	if(choice == 1)
		char ext[] = '.txt';
	else
		if(choice == 2)
			ext = '.dat';
		else
			if(choice == 3)
				ext = '.in';
			else
				if(choice == 4)
					ext = '.ttd';
}