Your job is to develop code to perform the daily account maintenance duties at B
ID: 3559854 • Letter: Y
Question
Your job is to develop code to perform the daily account maintenance duties at Bank.com. Every morning they want to examine the active accounts and either (a) give them interest on their savings or (b) charge them interest on thei r credit.
#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
// Function prototypes
//[BEGIN MAIN]
int main()
{
std::string inputFileName;
std::string outputFileName;
double interestRate;
std::cout << "Enter an input filename: ";
std::cin >> inputFileName;
std::cout << "Enter an output filename: ";
std::cin >> outputFileName;
std::cout << "Enter an interest rate (%): ";
std::cin >> interestRate;
std::cout << std::endl;
std::ifstream ifile = GetInputFile(inputFileName);
std::ofstream ofile = GetOutputFile(outputFileName);
std::cout << "Current account status:" << std::endl;
PrintFileContents(ifile);
ProcessAccounts(ifile, ofile, interestRate);
ifile.close();
ofile.close();
std::cout << std::endl;
std::cout << "New account status:" << std::endl;
ifile = GetInputFile(outputFileName);
PrintFileContents(ifile);
ifile.close();
std::cout << "Press ENTER";
std::cin.ignore();
std::cin.get();
return 0;
}
//[END MAIN]
void ProcessAccounts(std::ifstream &ifile, std::ofstream &ofile, double rate)
{
// Everyday the bank checks the status of the accounts and processes them
// If the customer has:
// 1) a positive savings balance, pay them interest
// 2) a negative savings balance, transfer it to credit (credit is positive)
// 3) a credit balance, charge them interest
// Note: Unlike normal banks, the interest rate for savings and credit is the same
// Read the info from the input file
// Put the new info into the output file
// The format for the input file and output file should be
// [NAME] [SAVINGS BALANCE] [CREDIT BALANCE]
// There is a single space between each value and a newline at the end
// Put your code here
}
void PrintFileContents(std::ifstream &str)
{
// Print the contents of the file
// First, print the file headers
// Then, print each line.
// Make sure the text is properly formatted
// Remember the functions available in iomanip?
// EXAMPLE:
// Name Savings Credit
// Bob $23.56 $0.00
// Joe $43.52 $0.00
// Sally -$1.58 $0.00
// Put your code here
}
std::ifstream GetInputFile(std::string filename)
{
// Open the file named filename
// Make sure it exists
// Return it as an input file stream
// Put your code here
}
std::ofstream GetOutputFile(std::string filename)
{
// Open the file named filename
// Make sure it exists
// Return it as an output file stream
// Put your code here
}
void SetInputStreamPos(std::ifstream &str, int pos)
{
// Set the 'g'et cursor to the desired byte in the stream
// Use the beginning of the file as the reference point
// Put your code here
}
void SetOutputStreamPos(std::ofstream &str, int pos)
{
// Set the 'p'ut cursor to the desired byte in the stream
// Use the beginning of the file as the reference point
// Put your code here
}
Explanation / Answer
#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
// Function prototypes
void PrintFileContents(std::ifstream& ifile);
void ProcessAccounts(std::ifstream& ifile, std::ofstream& ofile, double);
void SetInputStreamPos(std::ifstream &str, int pos);
void SetOutputStreamPos(std::ofstream &str, int pos);
std::ifstream& GetInputFile(std::string filename);
std::ofstream& GetOutputFile(std::string filename);
//[BEGIN MAIN]
int main()
{
std::string inputFileName;
std::string outputFileName;
double interestRate;
std::cout << "Enter an input filename: ";
std::cin >> inputFileName;
std::cout << "Enter an output filename: ";
std::cin >> outputFileName;
std::cout << "Enter an interest rate (%): ";
std::cin >> interestRate;
std::cout << std::endl;
std::ifstream &ifile = GetInputFile(inputFileName);
std::ofstream &ofile = GetOutputFile(outputFileName);
std::cout << "Current account status:" << std::endl;
PrintFileContents(ifile);
ProcessAccounts(ifile, ofile, interestRate);
ifile.close();
ofile.close();
std::cout << std::endl;
std::cout << "New account status:" << std::endl;
std::ifstream &ifile1 = GetInputFile(outputFileName);
PrintFileContents(ifile1);
ifile1.close();
std::cout << "Press ENTER";
std::cin.ignore();
std::cin.get();
return 0;
}
//[END MAIN]
void ProcessAccounts(std::ifstream &ifile, std::ofstream &ofile, double rate)
{
// Everyday the bank checks the status of the accounts and processes them
// If the customer has:
// 1) a positive savings balance, pay them interest
// 2) a negative savings balance, transfer it to credit (credit is positive)
// 3) a credit balance, charge them interest
// Note: Unlike normal banks, the interest rate for savings and credit is the same
// Read the info from the input file
// Put the new info into the output file
// The format for the input file and output file should be
// [NAME] [SAVINGS BALANCE] [CREDIT BALANCE]
// There is a single space between each value and a newline at the end
// Put your code here
std::string name;
double sav_balance;
double credit_balance;
ifile >> name >> sav_balance >> credit_balance;
while(!ifile.eof())
{
//std::cout << name << " " << sav_balance << " " << credit_balance << std::endl;
double sav_final=0;
double credit_final=0;
if(sav_balance > 0) // 1) a positive savings balance, pay them interest
sav_final = sav_balance + sav_balance*rate;
else if(sav_balance < 0) // 2) a negative savings balance, transfer it to credit (credit is positive)
credit_final = credit_balance - sav_balance;
if(credit_balance > 0) // 3) a credit balance, charge them interest
credit_final = credit_final + credit_balance*rate;
ofile << name << " " << sav_final << " " << credit_final << std::endl;
//std::cout << name << " " << sav_final << " " << credit_final << std::endl;
ifile >> name >> sav_balance >> credit_balance;
}
}
void PrintFileContents(std::ifstream &str)
{
// Print the contents of the file
// First, print the file headers
// Then, print each line.
// Make sure the text is properly formatted
// Remember the functions available in iomanip?
// EXAMPLE:
// Name Savings Credit
// Bob $23.56 $0.00
// Joe $43.52 $0.00
// Sally -$1.58 $0.00
// Put your code here
std::string name;
double sav_balance;
double credit_balance;
std::cout <<"Name Savings Credit" << std::endl;
str >> name >> sav_balance >> credit_balance;
while(!str.eof())
{
std::cout << std::setprecision(2) << std::fixed << name << " $" << sav_balance <<" $"<< credit_balance << std::endl;
str >> name >> sav_balance >> credit_balance;
}
}
std::ifstream& GetInputFile(std::string filename)
{
// Open the file named filename
// Make sure it exists
// Return it as an input file stream
// Put your code here
static ifstream ifile;
ifile.open(filename);
if(!ifile.is_open())
{
ifile.close();
}
else;
{
std::cout <<"unable to open file so Exiting .." << std::endl;
}
return ifile;
}
std::ofstream& GetOutputFile(std::string filename)
{
// Open the file named filename
// Make sure it exists
// Return it as an output file stream
// Put your code here
static ofstream ofile;
ofile.open(filename);
if(!ofile.is_open())
{
ofile.close();
}
else
{
std::cout <<"unable to open file so Exiting .." << std::endl;
}
return ofile;
}
void SetInputStreamPos(std::ifstream &str, int pos)
{
// Set the 'g'et cursor to the desired byte in the stream
// Use the beginning of the file as the reference point
// Put your code here
str.clear();
str.seekg(pos, std::ios::beg);
}
void SetOutputStreamPos(std::ofstream &str, int pos)
{
// Set the 'p'ut cursor to the desired byte in the stream
// Use the beginning of the file as the reference point
// Put your code here
str.clear();
str.seekp(pos, std::ios::beg);
}
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