C++

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loop from input text file

RichHoang (1)
I am having trouble performing a loop from an input text file, here is what I have so far:


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//preprocessor directives
#include<iostream>
#include<fstream>
#include<iomanip>
//step 1

using namespace std;
int main(){
    system("color f0");
    
    cout<<"=******************************************="<<endl;
    cout<<"*   IT210 Business Applications with C++   *"<<endl;
    cout<<"*   Programmer: Richard Hoang              *"<<endl;
    cout<<"*   Date: October 15, 2015                 *"<<endl;
    cout<<"*   Assignment 2 - Interest Calculator     *"<<endl;
    cout<<"=******************************************="<<endl;
    
    //declare objects of type ifstream and ofstream
    ifstream fin;
    ofstream fout;
    
    //open fin and fout or associate files with fin and fout
    fin.open("customer.txt");
    fout.open("output.txt");
    
    //error check fin and fout
    if(!fin){
             cout<<"Input failure/n";
             system("pause");
             return 1;
             }//end of fin error check
             
    if(!fout){
              cout<<"Output failure/n";
              system("pause");
              return 1;
              }//end of fout error check
              
    cout<<"Successfully opened input/output files"<<endl;
    //execute at this stage always
    
    cout<<endl;
    cout<<endl;
    
    cout<<"This program calculates the interest on unpaid"<<endl;
    cout<<"credit card balances using the average daily balance"<<endl;
    cout<<"and the total interest owed to the Bank"<<endl;
    
    cout<<endl;
    cout<<endl;
    
    
    //read from input text files
    string firstName;
    string lastName;
    int credit;
    float netBalance;
    float payment;
    int d1;
    int d2;
    float averageDailybalance;
    float interest;
    float APR;
    
    
    //output to monitor and text files
    cout<<"************************************************************"<<endl;
    cout<<"123456789012345678901234567890123456789012345678901234567890"<<endl;
    cout<<"************************************************************"<<endl;
    cout<<left<<setw(20)<<"FULL NAME"<<setw(13)<<"CARD #"<<setw(10)<<"BALANCE"<<
    setw(9)<<"APR (%)"<<setw(8)<<"INTEREST"<<endl;
    cout<<"------------------------------------------------------------"<<endl;
    
    
    
    while(fin){
                   
    //step 4
    fin>>firstName>>lastName>>credit>>netBalance>>payment>>d1>>d2;
    
    averageDailybalance=(netBalance*d1-payment*d2)/d1;
    
    if(averageDailybalance<=100.00){
                    APR="5.0/n";
                    
  

                    system("pause");
                    return 1;
                    }
    
    interest=averageDailybalance*(APR/100.0*12.0);
    

    
    cout<<left<<setw(20)<<firstName<<setw(10)<<credit<<setw(10)<<right<<fixed<<setprecision(2)
    <<netBalance<<setw(10)<<APR<<setw(10)<<interest<<endl;
    
    fout<<left<<setw(20)<<firstName<<setw(10)<<credit<<setw(10)<<right<<fixed<<setprecision(2)
    <<netBalance<<setw(10)<<APR<<setw(10)<<interest<<endl;
    
    if(fin.peek()=='\n')fin.ignore();
    }//end of fin controlled while
    
   

    //fin.close fin and fout
    fin.close();
    fout.close();
    
    
    cout<<"------------------------------------------------------------"<<endl;
    
    cout<<endl;
    cout<<endl;
    cout<<"12345678901234567890123456789012345678901234567890"<<endl;
    cout<<"**************************************************"<<endl;
    cout<<endl;
    cout<<endl;
    cout<<"Total interest owed to Bank is $"<<interest;
    cout<<endl;
    cout<<endl;
    cout<<"**************************************************"<<endl;
    cout<<endl;
    cout<<endl;
    
    system("pause");
    return 0;
    
    
    
}//end of main


My main problem is with
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 averageDailybalance=(netBalance*d1-payment*d2)/d1;
    
    if(averageDailybalance<=100.00){
                    APR="5.0/n";
                    
  

                    system("pause");
                    return 1;
                    }
    
    interest=averageDailybalance*(APR/100.0*12.0);


how do I set the parameters for assigning a value for APR depending on average daily balance?
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