Ouputting to a file?

OK heres my second question of the day. I am trying to output my information to the screen and to a file called billing.dat. I have perused the board and I just don't understand the FAQ or other users explaination of how to do it. I do know I have to include fstream (which I did) but from there I am completely lost. I have included my sample code...I don't want it done for me just a laymans explaination of how to output my information to a file. I am a newbie after all =/

Code:

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


const double RED_RUG = 4.99;
const double GREEN_RUG = 5.99;
const double BLUE_RUG = 6.99;







int main()

{
	char filename[15];
    string discount;
	char customerName[25];
	char rugColor;
    char paymentMethod;
	int roomLength;
    int roomWidth;                                            //variables
	string rugDisplay;
	string discountPercent;
	int roomArea;
	double endDiscount;
	double paidDiscount;
	double rugCost;
	double carpetCost;
	double trueCost;
 
    cout<<setiosflags(ios::fixed);

	cout<<"Enter file name for billing: ";
	cin.getline(filename,15);

	
	cout<<setw(20)<<"Welcome to..."<<endl;
	cout<<endl;
	cout<<setw(40)<<">>>Phils Floors<<<<"<<endl;                     //business header-output to screen
	cout<<endl;
	cout<<setw(36)<<"Our Rugs Rock"<<endl;
	cout<<endl;


	cout<<"If you enter the customers name, type of rug purchased,"<<endl;
    cout<<"room dimensions, and type of payment, this program"<<endl;       //program explaination
    cout<<"will calculate and print a bill to a file, Billing.dat"<<endl;
	cout<<endl;
	

	cout<<"Please enter the customers name: ";
	cin.getline(customerName,25);                                //input customers name
	cout<<endl;

	cout<<"Please enter rug color (R)ed (B)lue (G)reen: ";
    cin>>rugColor;                                               //input rug color
	cout<<endl;

	if (rugColor == 'R' || rugColor == 'r')
	{
		rugDisplay = "RED";
		rugCost = RED_RUG;
	}
	else
		if (rugColor == 'B' || rugColor == 'b')
	{
		rugDisplay = "BLUE";                                     //set rugdisplay variable and cost of rug
		rugCost = BLUE_RUG;                                          
	}
	else
		if(rugColor == 'G' || rugColor == 'g')
	{
		rugDisplay = "GREEN";
		rugCost = GREEN_RUG;
	}
    else
	{
		rugDisplay = "Default";
		rugCost = 6.99;
	}
	 
    cout<<"Please enter the method of payment"<<endl;
	cout<<"(C)ash (Z)ippy or (O)ther: ";
	cin>>paymentMethod;                                           //input payment method
	cout<<endl;
 
    if (paymentMethod == 'C' || paymentMethod == 'c')
	{
		paidDiscount = .10;
	}

	else if (paymentMethod == 'Z' || paymentMethod == 'z')        //set paidDiscount variable to use in calculation
	{
	    paidDiscount = .05;
	}

	else 
	{
	    paidDiscount = 1;
	}


	if (paymentMethod == 'C' || paymentMethod == 'c')
	{
		 discount = "Cash and Carry";
		 discountPercent = "10% -- Cash and Carry";
	}
	else if (paymentMethod == 'Z' || paymentMethod == 'z')
	{
    	 discount = "Zippy Discount";                             //set discount variables (output messages)
         discountPercent = "5% -- Zippy Discount";
	}
   	else if (paymentMethod == 'O' || paymentMethod == 'o')
	{
	     discount = "No Discount";
		 discountPercent = "No Discount";
	}
	    
	else 
	{
	     discount = "No payment type specified";
	     discountPercent = "No Discount";
	}

    
   	
	cout<<"Enter the Length of your room: ";                      //input room length
	cin>>roomLength;
	cout<<endl;

	cout<<"Enter the Width of your room: ";
	cin>>roomWidth;                                               //input room width
    cout<<endl;
	cout<<endl;
	cout<<endl;
    cout<<endl;
	cout<<endl;
	cout<<endl;

	roomArea = roomWidth * roomLength;                            //calculate room area

    carpetCost = roomArea * rugCost;                              //calculate rug cost

    endDiscount = roomArea * rugCost * paidDiscount;              //calculate discount

    trueCost = carpetCost - endDiscount;                          //calculate carpet cost minus the discount (truecost)

     if (paidDiscount == 1)
	{
		trueCost = carpetCost;                                    //set no discount variables
        endDiscount = 0;
	}

    
	cout<<setw(40)<<">>>Phil's Floors<<<<"<<endl;
	cout<<endl;                                             //output header
	cout<<setw(36)<<"Our Rugs Rock"<<endl;
	cout<<endl;
        
	cout<<"Customer Name:"<<setw(27)<<customerName<<endl;         //output customer name
	cout<<endl;

	cout<<"Rug Color:"<<setw(31)<<rugDisplay<<endl;               //output rugcolor
	cout<<endl;

	cout<<"Payment Method:"<<setw(26)<<discount<<endl;            //output payment method
	cout<<endl;

	cout<<setw(30)<<discountPercent<<endl;                        //output discount percent message
	cout<<endl;

	
    
    	
    cout<<setprecision(2)<<"Discount: "<<setw(26)<<"$"<<endDiscount<<endl;           //output discount
	cout<<endl;
    
	cout<<setprecision(2)<<"Rug Cost: "<<setw(25)<<"$"<<carpetCost<<endl;            //output carpet cost (before discount)

	cout<<endl;
    
	cout<<setprecision(2)<<"Final Cost:"<<setw(24)<<"$"<<trueCost<<endl;             //output carpet cost(final cost-after discount)
	cout<<endl;



	
	return 0;

}

Code:

#include <fstream>
using namespace std;

int main()
{
  ofstream fout;
  fout.open("some_file_name");
  fout << "Hello World!";
  return 0;
}

Thanks Josh coupled with the FAQ that made sense to me. The problem I have having now is I am prompting for a filename (which needs to be billing.dat) and it's not creating it under that name. I prompt for the filename then send it to a variable (char filename[15] ) in this case. Also where should I stick ofstream.fout? that usually go up with the variable declarations?
I am also having format problems with the file:

Customer Name: customer name

Rug Color: BLUE

Payment Method: Cash and Carry

10% -- Cash and Carry

Discount: $34

Rug Cost: $3.4e+002

Final Cost: $3e+002

I am getting those funky numbers like it doesn't see cout<<setiosflags(ios::fixed);
Do I need to stick that down after where I open the file up?

heres my new code

Code:

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


const double RED_RUG = 4.99;
const double GREEN_RUG = 5.99;
const double BLUE_RUG = 6.99;







int main()

{
    
	char filename[15];
    string discount;
	char customerName[25];
	char rugColor;
    char paymentMethod;
	int roomLength;
    int roomWidth;                                            //variables
	string rugDisplay;
	string discountPercent;
	int roomArea;
	double endDiscount;
	double paidDiscount;
	double rugCost;
	double carpetCost;
	double trueCost;

    
 
    cout<<setiosflags(ios::fixed);

	cout<<"Enter file name for billing: ";
	cin.getline(filename,15);

	
	cout<<setw(20)<<"Welcome to..."<<endl;
	cout<<endl;
	cout<<setw(40)<<">>>Phils Floors<<<<"<<endl;                     //business header-output to screen
	cout<<endl;
	cout<<setw(36)<<"Our Rugs Rock"<<endl;
	cout<<endl;


	cout<<"If you enter the customers name, type of rug purchased,"<<endl;
    cout<<"room dimensions, and type of payment, this program"<<endl;       //program explaination
    cout<<"will calculate and print a bill to a file, Billing.dat"<<endl;
	cout<<endl;
	

	cout<<"Please enter the customers name: ";
	cin.getline(customerName,25);                                //input customers name
	cout<<endl;

	cout<<"Please enter rug color (R)ed (B)lue (G)reen: ";
    cin>>rugColor;                                               //input rug color
	cout<<endl;

	if (rugColor == 'R' || rugColor == 'r')
	{
		rugDisplay = "RED";
		rugCost = RED_RUG;
	}
	else
		if (rugColor == 'B' || rugColor == 'b')
	{
		rugDisplay = "BLUE";                                     //set rugdisplay variable and cost of rug
		rugCost = BLUE_RUG;                                          
	}
	else
		if(rugColor == 'G' || rugColor == 'g')
	{
		rugDisplay = "GREEN";
		rugCost = GREEN_RUG;
	}
    else
	{
		rugDisplay = "Default";
		rugCost = 6.99;
	}
	 
    cout<<"Please enter the method of payment"<<endl;
	cout<<"(C)ash (Z)ippy or (O)ther: ";
	cin>>paymentMethod;                                           //input payment method
	cout<<endl;
 
    if (paymentMethod == 'C' || paymentMethod == 'c')
	{
		paidDiscount = .10;
	}

	else if (paymentMethod == 'Z' || paymentMethod == 'z')        //set paidDiscount variable to use in calculation
	{
	    paidDiscount = .05;
	}

	else 
	{
	    paidDiscount = 1;
	}


	if (paymentMethod == 'C' || paymentMethod == 'c')
	{
		 discount = "Cash and Carry";
		 discountPercent = "10% -- Cash and Carry";
	}
	else if (paymentMethod == 'Z' || paymentMethod == 'z')
	{
    	 discount = "Zippy Discount";                             //set discount variables (output messages)
         discountPercent = "5% -- Zippy Discount";
	}
   	else if (paymentMethod == 'O' || paymentMethod == 'o')
	{
	     discount = "No Discount";
		 discountPercent = "No Discount";
	}
	    
	else 
	{
	     discount = "No payment type specified";
	     discountPercent = "No Discount";
	}

    
   	
	cout<<"Enter the Length of your room: ";                      //input room length
	cin>>roomLength;
	cout<<endl;

	cout<<"Enter the Width of your room: ";
	cin>>roomWidth;                                               //input room width
    cout<<endl;
	cout<<endl;
	cout<<endl;
    cout<<endl;
	cout<<endl;
	cout<<endl;

	roomArea = roomWidth * roomLength;                            //calculate room area

    carpetCost = roomArea * rugCost;                              //calculate rug cost

    endDiscount = roomArea * rugCost * paidDiscount;              //calculate discount

    trueCost = carpetCost - endDiscount;                          //calculate carpet cost minus the discount (truecost)

     if (paidDiscount == 1)
	{
		trueCost = carpetCost;                                    //set "no discount" variables
        endDiscount = 0;
	}


        
	cout<<setw(40)<<">>>Phil's Floors<<<<"<<endl;
	cout<<endl;                                             //output header
	cout<<setw(36)<<"Our Rugs Rock"<<endl;
	cout<<endl;

    ofstream fout;

    fout.open("filename");
       
	fout<<"Customer Name:"<<setw(27)<<customerName<<endl;         //output customer name
	fout<<endl;

	fout<<"Rug Color:"<<setw(31)<<rugDisplay<<endl;               //output rugcolor
	fout<<endl;

	fout<<"Payment Method:"<<setw(26)<<discount<<endl;            //output payment method
	fout<<endl;

	fout<<setw(30)<<discountPercent<<endl;                        //output discount percent message
	fout<<endl;
    	
    fout<<setprecision(2)<<"Discount: "<<setw(26)<<"$"<<endDiscount<<endl;           //output discount
	fout<<endl;
    
	fout<<setprecision(2)<<"Rug Cost: "<<setw(25)<<"$"<<carpetCost<<endl;            //output carpet cost (before discount)

	fout<<endl;
    
	fout<<setprecision(2)<<"Final Cost:"<<setw(24)<<"$"<<trueCost<<endl;             //output carpet cost(final cost-after discount)
	fout<<endl;
    
	fout.close();
        

	
	return 0;

bleh spoke too soon I figured out how to format the output......still need a hand with getting the compiler to see my variable as the filename I want to use and where the proper place is to stick ofstream fout; is?

spoke too soon again, I figured it out....thanks for all the help!