C and C++

Welcome to Dream.In.Code
	Become a C++ Expert! Join 137,208 C++ Programmers for FREE! Get instant access to thousands of C++ experts, tutorials, code snippets, and more! There are 2,321 people online right now. Registration is fast and FREE... Join Now! Chat LIVE With a C++ Expert

File Reading and Writing

File Reading and Writing, Write a program that reads the file Employee.dat as input...

Options

idle_09	6 Jul, 2008 - 06:28 PM Post #1
New D.I.C Head Joined: 2 Mar, 2008 Posts: 17 My Contributions	Hi! Thanks for helping me. I need to write a program (in C++) that reads the file Employee.dat as input and then outputs to 4 different files which are Managers.dat, Marketing.dat, Developers.dat, and Testers.dat. Each of the output files contains the name of the employees of its category. The fle Employee.dat contains following data: Sue Leon 4 Robert Wise 3 Sam Woo 1 Nathan White 3 Suzan Head 2 Henry Williams 4 Christine Mint 1 Kim Leeds 4 Elton Sue 3 Ken Latch 2 I tried to write the program but I don't know what to put in "SWITCH" loop. Here is what i have so far. cpp #include <iostrean> #include <fstream> #include <cstdlib> #include <string> using namespace std; int main() { ifstream in_stream; ofstream out_stream; in_stream.open("Employee.dat"); if (in_stream.fail()) { cout << "Input file failed to open.\n"; exit(1); } out_stream.open(("Managers.dat", ios::app), ("Marketing.dat", ios::app), ("Developers.dat", ios::app), ("Testers.dat", ios::app); if (out_stream.fail()) { cout << "Output file failed to open.\n"; exit(1); } string first_name, last_name; enum department { Managers = 1, Marketing = 2, Developers = 3, Testers = 4 }; im_stream >> first_name >> last_name >> department; while (!in_stream.eof()) { switch (department) { number '1'; out_stream << " Mod Edit: Please Thanks, gabehabe
	This Post Was Helpful!


Register for Free to Make These Ads Go Away!

realNoName	RE: File Reading And Writing 6 Jul, 2008 - 07:18 PM Post #2
D.I.C Regular Joined: 4 Dec, 2006 Posts: 300 Thanked: 5 times My Contributions	1) you have a typo with your includes #include <iostrean> -- should be --> #include <iostream> 2) you can only have 1 file per variable so you need something like this CODE ofstream managers("Managers.dat", ios::app), marketing("Marketing.dat", ios::app), developers("Developers.dat", ios::app), testers("Testers.dat", ios::app); * you will have to change your if statement 3) another typo with im_stream... -- should be --> in_stream... 4) you need to make an int variable to hold the department 5) you want to move your input inside your while loop CODE while (!in_stream.eof()) { in_stream >> first_name >> last_name >> dep; //do stuff } 6) your switch will look something like this (in problem 4 i made a int called dep) CODE switch(dep) { case Managers: // do stuff break; case Marketing: // do other stuff break; }
	This Post Was Helpful!

idle_09

RE: File Reading And Writing
7 Jul, 2008 - 12:26 PM

Post #3

New D.I.C Head

Joined: 2 Mar, 2008
Posts: 17

Windows

My Contributions

This is UPDATED CODE. I am getting some SYNTEX ERRORS.

cpp

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

int main()
{
	string line;
	ifstream in_stream;
	ofstream out_stream;

	in_stream.open("Employee.dat");
	if (in_stream.fail())
	{
		cout << "Input file failed to open.\n";
		exit(1);
	}

	ofstream("Managers.dat", ios::app),
			("Marketing.dat", ios::app),
			("Developers.dat", ios::app),
			("Testers.dat", ios::app);
	if (out_stream.fail())
	{
		cout << "Output file failed to open.\n";
		exit(1);
	}

	string first_name, last_name;
	int departmnet;
	enum department { Managers = 1, Marketing = 2, Developers = 3, Testers = 4 };

	in_stream >> first_name >> last_name;
	while (!in_stream.eof())
	{
		in_stream >> first_name >> last_name;
		switch (department)
		{
			department '1':
				cout << first_name << last_name;
				break;

			department '2':
				cout << first_name << last_name;
				break;

			department '3': //syntax error : missing ';' before ':'
				cout << first_name << last_name;
				break;

			department '4':
				cout << first_name << last_name;
		}
	}
	return 0;
}

Mod Edit: (again)

Please

Thanks, gabehabe

This Post Was Helpful!

gabehabe

RE: File Reading And Writing
7 Jul, 2008 - 12:39 PM

Post #4

Donkey DIC

Joined: 6 Feb, 2008
Posts: 5,556

Windows

Thanked: 99 times
Dream Kudos: 2650
Expert In: ruling the world.

My Contributions

The only real problem was with your switch. The syntax is:
case 1: instead of department '1':

cpp

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

int main()
{
	string line;
	ifstream in_stream;
	ofstream out_stream;

	in_stream.open("Employee.dat");
	if (in_stream.fail())
	{
		cout << "Input file failed to open.\n";
		exit(1);
	}

	ofstream("Managers.dat", ios::app),
			("Marketing.dat", ios::app),
			("Developers.dat", ios::app),
			("Testers.dat", ios::app);
	if (out_stream.fail())
	{
		cout << "Output file failed to open.\n";
		exit(1);
	}

	string first_name, last_name;
	int department;
	enum department { Managers = 1, Marketing = 2, Developers = 3, Testers = 4 };

	in_stream >> first_name >> last_name;
	while (!in_stream.eof())
	{
		in_stream >> first_name >> last_name;
		switch (department)
		{
			case 1:
				cout << first_name << last_name;
				break;

			case 2:
				cout << first_name << last_name;
				break;

			case 3: //syntax error : missing ';' before ':'
				cout << first_name << last_name;
				break;

			case 4:
				cout << first_name << last_name;
		}
	}
	return 0;
}

Hope this helps

This Post Was Helpful!

idle_09

RE: File Reading And Writing
7 Jul, 2008 - 01:41 PM

Post #5

New D.I.C Head

Joined: 2 Mar, 2008
Posts: 17

Windows

My Contributions

I am still getting 6 ERRORS:

cpp

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

int main()
{
	string line;
	ifstream in_stream;
	ofstream out_stream;

	in_stream.open("Employee.dat");
	if (in_stream.fail())
	{
		cout << "Input file failed to open.\n";
		exit(1);
	}

	ofstream("Managers.dat", ios::app),
			("Marketing.dat", ios::app),
			("Developers.dat", ios::app),
			("Testers.dat", ios::app);
	if (out_stream.fail())
	{
		cout << "Output file failed to open.\n";
		exit(1);
	}

	string first_name, last_name;
	int departmnet;
	enum department { Managers = 1, Marketing = 2, Developers = 3, Testers = 4 };

	in_stream >> first_name >> last_name;
	while (!in_stream.eof())
	{
		in_stream >> first_name >> last_name;
		switch (department)//error C2059: syntax error : ')'
		{//error : missing ';' before '{'
				case 1://error: illegal case
				cout << first_name << last_name;
				break;

				case 2://error: illegal case
				cout << first_name << last_name;
				break;

				case 3://error: illegal case
				cout << first_name << last_name;
				break;

				case 4://error: illegal case
				cout << first_name << last_name;
		}
	}
	return 0;
}

Mod Edit: (again)
Please

Thanks, gabehabe

This Post Was Helpful!

realNoName	RE: File Reading And Writing 7 Jul, 2008 - 05:48 PM Post #6
D.I.C Regular Joined: 4 Dec, 2006 Posts: 300 Thanked: 5 times My Contributions	QUOTE(gabehabe @ 7 Jul, 2008 - 01:39 PM) The only real problem was with your switch. The syntax is: case 1: instead of department '1': Hope this helps Really, i hope you just didn't look at the code that much... maybe its just me but i dont see how thats going to work at all Here is most of the code fixed you just need to add a little more to the switch CODE #include <iostream> #include <fstream> #include <cstdlib> #include <string> using namespace std; int main() { // this variable is not used //string line; ifstream in_stream; // dont need this... you have to have a variable for each file //ofstream out_stream; in_stream.open("Employee.dat"); if (in_stream.fail()) { cout << "Input file failed to open.\n"; exit(1); } /* So whats are the variable names? how do you use them if they dont have names? ofstream("Managers.dat", ios::app), ("Marketing.dat", ios::app), ("Developers.dat", ios::app), ("Testers.dat", ios::app); / / All you had to do was copy my code what this does is make 4 variables (managers,marketing,developers,testers) for the file handling / ofstream managers("Managers.dat", ios::app), marketing("Marketing.dat", ios::app), developers("Developers.dat", ios::app), testers("Testers.dat", ios::app); // if one of the files didnt open then exit if (managers.fail() \|\| marketing.fail() \|\| developers.fail() \|\| testers.fail()) { cout << "Output file failed to open.\n"; exit(1); } string first_name, last_name; //int departmnet; // dont know if this is a typo or not int dep; enum department { Managers = 1, Marketing = 2, Developers = 3, Testers = 4 }; //if you keep this here the first person in your employee's file would never get sorted //in_stream >> first_name >> last_name; while (!in_stream.eof()) { in_stream >> first_name >> last_name >> dep; switch (dep) { // you could use case 1: case Managers: // send first_name and last_name to the managers stream aka Managers.dat managers << first_name << ' ' << last_name << endl; break; // you could use case 2: case Marketing: marketing << first_name << ' ' << last_name << endl; break; default: cout << "Department not found" << endl; } } return 0; } This post has been edited by realNoName*: 7 Jul, 2008 - 05:50 PM
	This Post Was Helpful!

gabehabe	RE: File Reading And Writing 8 Jul, 2008 - 01:41 AM Post #7
Donkey DIC Joined: 6 Feb, 2008 Posts: 5,556 Thanked: 99 times Dream Kudos: 2650 Expert In: ruling the world. My Contributions	QUOTE(realNoName @ 8 Jul, 2008 - 02:48 AM) Really, i hope you just didn't look at the code that much... maybe its just me but i dont see how thats going to work at all You're right, I didn't I was doing 1,001 other things at the same time. Sorry about that.
	This Post Was Helpful!