Master List
  5 Mike Smith   2098.72
  6 Sue Nathan   1234.32
100 Bobby Jones   519.69
125 Sally Mayer   345.74
200 Danny Glover 5623.18

Transaction List
  1  568.34
  5  345.10
  6 1012.43
 17 2045.12
100 1231.00
101  167.39
125 5239.67

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

// Pseudocode PLD Chapter 7 #6a pg. 301
// Start
//     Declarations
//         InputFile masterFile;
//         InputFile transactionFile;
//         OutputFile newMasterFile;
//         num mClientNumber, mtotalClientCost, tClientNumber, titemClientCost
//         string mClientfName, mClientlName
//     output "Master File Updating Starting"
//     open masterFile "Master.rtf"
//     open transactionFile "Transaction.rtf"
//     open newMasterFile "newMaster.rtf"
//     read mClientNumber, mClientfName, mClientlName, mtotalClientCost from masterFile
//     read tClientNumber, titemClientCost from transactionFile
//     while ( transactionFile not EOF )
//         while (( masterFile not EOF) and (mClientNumber < tClientNumber))
//             output mClientNumber, mClientfName, mClientlName, mtotalClientCost to newMasterFile
//             read mClientNumber, mClientfName, mClientlName, mtotalClientCost from masterFile
//         endwhile
//         if (masterFile is EOF)
//             output "Error Client ID: ", tClientNumber, " not in Master File."
//         else if (mClientNumber == tClientNumber) then
//             mtotalClientCost = mtotalClientCost + titemClientCost
//             output mClientNumber, mClientfName, mClientlName, mtotalClientCost to newMasterFile
//             read mClientNumber, mClientfName, mClientlName, mtotalClientCost from masterFile
//         else if (mClientNumber > tClientNumber) then
//             output "Error Client ID: ", tClientNumber, " not in Master File."
//         endif
//         read tClientNumber, titemClientCost from transactionFile
//     endwhile
//     while (masterFile not EOF)
//         output mClientNumber, mClientfName, mClientlName, mtotalClientCost to newMasterFile
//         read mClientNumber, mClientfName, mClientlName, mtotalClientCost from masterFile
//     endwhile
//     output "Master File Updating Complete"
//     close masterFile
//     close transactionFile
//     close newMasterFile
// Stop

int main(int argc, char *argv[])
{
    ifstream MasterFile;
    ifstream TransactionFile;
    ofstream New_MasterFile;
    int mClientNumber;
    double mtotalClientCost;
    int tClientNumber;
    double titemClientCost;
    string mClientfName;
    string mClientlName;

    cout << "Master File Updating Starting" << endl;

    MasterFile.open("Master.txt");
    TransactionFile.open("Transaction.txt");
    New_MasterFile.open("newMaster.txt");

    MasterFile >> mClientNumber;
    MasterFile >> mClientfName;
    MasterFile >> mtotalClientCost;
    MasterFile >> mClientlName;
    TransactionFile >> tClientNumber;
    TransactionFile >> titemClientCost;

    while(!TransactionFile.eof())
    {
           while (( !MasterFile.eof()) and (mClientNumber < tClientNumber))
           {

           New_MasterFile << mClientNumber;
           New_MasterFile << mClientfName;
           New_MasterFile << mClientlName;
           New_MasterFile << mtotalClientCost;

           MasterFile >> mClientNumber;
           MasterFile >> mClientfName;
           MasterFile >> mClientlName;
           MasterFile >> mtotalClientCost;
           }
               if (!MasterFile.eof())
           {
               cout << "ERROR Client ID: " << tClientNumber << " not in Master File. " ;
               }
               else if (mClientNumber == tClientNumber)
               {
                 mtotalClientCost = mtotalClientCost + titemClientCost;

                  New_MasterFile << mClientNumber;
                  New_MasterFile << mClientfName;
                  New_MasterFile << mClientlName;
                  New_MasterFile << mtotalClientCost;

                  MasterFile >> mClientNumber;
                  MasterFile >> mClientfName;
                  MasterFile >> mClientlName;
                  MasterFile >> mtotalClientCost;
               }
                 else if (mClientNumber > tClientNumber)
                      {
                 cout << "Error Client ID: ", tClientNumber, " not in Master File.";
                      }
           TransactionFile >> tClientNumber;
           TransactionFile >> titemClientCost;
           }
                           while (!MasterFile.eof())
                           {
                New_MasterFile << mClientNumber;
                New_MasterFile << mClientfName;
                New_MasterFile << mClientlName;
                New_MasterFile << mtotalClientCost;

                MasterFile >> mClientNumber;
                MasterFile >> mClientfName;
                MasterFile >> mClientlName;
                MasterFile >> mtotalClientCost;
                               }

    cout << "Master File Updating Complete " << endl;

    MasterFile.close();
    TransactionFile.close();
    New_MasterFile.close();


    system("PAUSE");
    return 0;
}

Master File Updating Starting
ERROR Client ID: 1 not in Master File.
ERROR Client ID: 5 not in Master File.