program help

[dan]

I need help in figuring out what to do for this program, it is a
program that reads book id, unit price, book purchased, book sold,
book returned, and city(respective ly). It is a control break program
that prints a report for each city on a separate screen with a total,
then at the end it has a grand total. It prints to the screen and an
output file.
Input file looks like (the char is the city)
200 1.40 30 13 1 B
201 7.50 13 1 0 B
202 2.50 50 23 3 B
198 5.00 45 15 2 C
200 1.40 13 2 0 C
201 7.85 15 5 0 N
202 2.25 50 30 1 N
155 3.50 11 5 1 P

sample output
Store: Bloomington (which is all the ones with the letter B at the
end)
ID Price Purchase Sold Returns Inventory Value
200 1.40 30 13 1 25.20
201 7.50 13 1 0 90.72
202 2.50 50 23 3 76.35
Total: 93 37 4 192.27
then one for city C, N, and P
Then a grand total for all the citys put together

Here is what i got so far that is probably not close to working

#include <iostream>
#include <cctype>
#include <iomanip>
#include <fstream>
#include <cstdlib>

using namespace std;

void Header();
void ReadInput(istre am& ins, int& id, double& unitPrice, int&
purchased, int& sold,
int& returned, char& city);

int main()
{
ifstream infile;
ofstream outfile;

infile.open("a: \\comics.txt");
if (infile.fail( )) {
cout << "Input file opening failed.\n";
system("pause") ;
exit(1);
}
outfile.open("a :\\inventory.tx t");
if (outfile.fail( )) {
cout << "Output file opening failed.\n";
system("pause") ;
exit(1);
}
// format double on the screen to print with 2 decimals
cout.setf(ios:: fixed);
cout.setf(ios:: showpoint);
cout.precision( 2);
// format doubles in the output file to print with 2 decimals
outfile.setf(io s::fixed);
outfile.setf(io s::showpoint);
outfile.precisi on(2);

int id, purchased, sold, returned;
double unitPrice;
int totalBooks = 0;
double invVal = 0;
char city;
int totalPurchased = 0, totalSold = 0, totalReturned = 0;
double totalInvVal = 0;
Header();
ReadInput(infil e, id, unitPrice, purchased, sold, returned, city);
totalBooks = (purchased - sold + returned);
invVal = (unitPrice * totalBooks);
bool first = true;
int oldCity = 0;
while(infile >> id >> unitPrice >> purchased >> sold >> returned >>
city);
{
infile >> city;
//if (!first && oldCity != city)
{
switch(city)
{
case 'B':
cout << "Store: Bloomington";
break;
case 'N':
cout << "Store: Normal";
break;
case 'C':
cout << "Store: Champaign";
break;
case 'U':
cout << "Store: Urbana";
break;
case 'P':
cout << "Store: Peoria";
break;
}
cout << endl << endl;
totalPurchased += purchased;
totalSold += sold;
totalReturned += returned;
totalInvVal += invVal;
outfile << "ID\t" << "Price\t" << "Purchase " << "Sold " <<
"Returns "
<< "Inv. Value\n";
cout << "ID\t" << "Price\t" << "Purchase " << "Sold " <<
"Returns "
<< "Inv. Value\n";
outfile << id << "\t" << unitPrice << "\t" << purchased << "\t "
<< sold << "\t "
<< returned << "\t " << invVal;
cout << id << "\t" << unitPrice << "\t" << purchased << "\t " <<
sold << "\t "
<< returned << "\t " << invVal;
cout << endl << endl;
cout << "Totals\t\t " << totalPurchased << totalSold << totalReturned
<< totalInvVal;
}
first = false;
oldCity = city;
}

infile.close( );
outfile.close( );
cout << endl << endl;
system("pause") ;
return EXIT_SUCCESS;
}
void ReadInput(istre am& ins, int& id, double& unitPrice, int&
purchased,
int& sold, int& returned, char& city)
{
ins >> id >> unitPrice >> purchased >> sold >> returned >> city;

}
void Header()
{
using namespace std;
cout << "\t\tCosmic Comics Inventory Report by Store\n";
cout << "\t\t Prepared by Daniel Buenger\n";
cout << "\t\t\t Date: Oct/30/2003\n\n";
}

Thanks in advance,
B14

[Chris Theis]

"dan" <da******@aol.c om> wrote in message
news:b0******** *************** ***@posting.goo gle.com...

I need help in figuring out what to do for this program, it is a
program that reads book id, unit price, book purchased, book sold,
book returned, and city(respective ly). It is a control break program
that prints a report for each city on a separate screen with a total,
then at the end it has a grand total. It prints to the screen and an
output file.
Input file looks like (the char is the city)
200 1.40 30 13 1 B
201 7.50 13 1 0 B
202 2.50 50 23 3 B
198 5.00 45 15 2 C
200 1.40 13 2 0 C
201 7.85 15 5 0 N
202 2.25 50 30 1 N
155 3.50 11 5 1 P

sample output

[SNIP]

Just some hints. You should think of a way to organize your data internally.
First, create a class that will store the information of one record. Then
you could for example use a multimap with the key being the city code and
the value being an object of your record class. After reading one line you
just add a new element to your multimap. In the end you've got a multimap
full of records which you just have to process accordingly. Of course there
are different, more sophisticated ways to organize your data but for this
simple thing the multimap might be sufficient. After the whole file has been
read you just go ahead creating the summary for all records sharing the same
key and you're done.

HTH
Chris