#include <iostream>
#include <stdlib.h>
#include <fstream>
#include <string>
using namespace std;
void createfile();
void rfile();
void wfile();
void tfile();
int main ()
{
	int op;
	do
	{
		system("cls");
	cout<<"1.c file"<<endl;
    cout<<"2.r file"<<endl;
	cout<<"3.w file"<<endl;
	cout<<"4.t file"<<endl;
	cout<<"5. exit"<<endl;
	cout<<"select 1/2/3/4/5"<<endl;
	cin>>op;
	switch(op)
	{
	case 1: createfile();system("pause");break;
	case 2:wfile();system("pause");break;
	case 3:rfile();system("pause");break;
	case 4:cout<<"4";system("pause");break;
	case 5:
		{
			char ch;
			cout<<"exit with <y>";
			cin>>ch;
			if (ch=='y')
				op=0;
		}
	default:
		cout<<"invalid operation"<<endl;
		break;
}
	}
	while(op!=0);
	return 0;
}
void createfile()
{
	fstream file("testfile.txt", ios::in|ios::out);
	file.close();
}
void wfile(){
	ofstream file;
	file.open("testfile.text");
	file<<"text";
	file.close();
}
void rfile()
{
	ifstream file;
	file.open("testfile.text");
	string data;
	getline(file,data);
	cout<<data<<endl;
}