Two-dimensional array Sales

**mikeprogram** · 12-04-2005

Hello, Everyone:

I'm writing a programing using a two-dimensional array to solve the following problem. A company has four salespeople (1 to 4) who sell five different products (1 to 5). Once a day, each salesperson passes in a slip for each different type of product sold. Each slip contains the following:
a. The salesperson number
b. The product number
c. The total dollar value of that product sold that day.

Thus, each salesperson passes in between 0 and 5 sales slips per day. Assume that the information from all of the slips for last month is available. Write a program that will read all this information for last month’s sales and summarize the total sales by salesperson by product. All totals should be stored in the two-dimensional array sales. After processing all the information for last month, print the results in tabular format with each of the columns representing a particular salesperson and each of the rows representing a particular product. Cross total each row to get the total sales by salesperson for the last month. Your tabular printout should include these cross totals to the right of totaled rows and to the bottom of the totaled columns.

Here is my code:

Code:

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

void instruct (void);

int main ()
{
   const int EMPLOYEE = 5, PRODUCTS = 6;
   double sales[ EMPLOYEE ][ PRODUCTS ] = { 0.0 }, value,
          totalSales, productSales[ PRODUCTS ] = { 0.0 },
          grandTotal = 0;
   int salesPerson, product;
   ifstream inDataFile ("A:/datafile.txt", ios::in );

   instruct ();
{
        if ( !inDataFile ) {
                cerr << "File could not be opened\n";
                exit( 1 );
        }
   cout << "\t  ***************** Reading Data From File *********"
        << "*******";
   inDataFile >> salesPerson;
   while ( salesPerson != -1 ) {
   inDataFile  >> product;
   inDataFile >> value;
              sales[ salesPerson ][ product ] += value;
   inDataFile >> salesPerson;
   }

     cout << "\n\t  The total sales for each sales person "
          << "are displayed\n\t  at the end of each row,"
          << "and the total sales for each\n\t  product "
          << "are displayed at the bottom of each column.\n"
                  << "-----------------------------------------------------"
                  << "--------------------------\n\n\n"
                  << "Sales |\t<---------------------- Products -----------"
                  << "---------->\n"
                  << "Person|\n"
                  << "_____________________________________________________"
                  << "__________________________\n"
          << setw( 10 ) << 1 << setw( 13 ) << 2
          << setw( 13 ) << 3 << setw( 13 ) << 4
          << setw( 13 ) << 5 << setw( 16 ) << "Total\n"
                  << "_____________________________________________________"
                  << "__________________________\n\n"
          << setiosflags( ios::fixed | ios::showpoint );
        
   for ( int i = 1; i < EMPLOYEE; ++i ) {
      totalSales = 0.0;
      cout << i;
      for ( int j = 1; j < PRODUCTS; ++j ) {
         totalSales += sales[ i ][ j ];
         cout << setw( 13 ) << setprecision( 2 )
              << sales[ i ][ j ];   
         productSales[ j ] += sales[ i ][ j ];
      }
                  
      cout << setw( 13 ) << setprecision( 2 )  
           << totalSales << '\n';
   }
   cout << "\n_____________________________________________________"
        << "__________________________\n"
        << setw( 80 ) << " Grand Total\n"
        << setw( 80 ) << "-----------\n";
   cout << "Total " << setw( 6 ) << setprecision( 2 )
        << productSales[ 1 ];
      
   for ( int j = 2; j < PRODUCTS; ++j )
      cout << setw( 13 ) << setprecision( 2 )
           << productSales[ j ];
                for ( int j = 0; j < PRODUCTS; ++j)
            grandTotal += productSales[j];
                 cout << setw( 13 ) << grandTotal
                          << "\n" << endl;
                  
}
           
return 0;
}
        
void instruct (void)
{
     // Declaration section
     cout << "This program will access the sales data information for last "
          << "months sales by\neach salesperson. This information is contained in "
          << "the disk file datafile.txt.\nThe program will then take the data and "
          << "compute the total sales by salesperson\nfor last month, and the total "
          << "sales of each product during the last month and\ndisplay the results "
          << "on the screen.\n"
          << "\n_____________________________________________________"
          << "__________________________\n"
          << endl;
    // Executable section
}

I created a datafile.txt, so the program can read it.

Code:

However, when I compile the program, it says that "File could not be opened"

Code:

g++ salesperson.cpp
a.out
This program will access the sales data information for last months sales by
each salesperson. This information is contained in the disk file datafile.txt.
The program will then take the data and compute the total sales by salesperson
for last month, and the total sales of each product during the last month and
display the results on the screen.

_______________________________________________________________________________

File could not be opened

I understand it seems too long to read but I really need to know how I can make the program read the datafile.txt, so the program can display the results I want. Please someone help me.
I will greatly appreciate.

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