ofstream & ifstream

[jascns1012]

I am having a hard time with this code and this is my 1st time to this website and to writing code.

#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>

// 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;
	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
	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\tSavings\tCredit" << std::endl;
	str >> name >> sav_balance >> credit_balance;

	while(!str.eof())
	{
		std::cout << std::setprecision(2) << std::fixed << name << "\t$" << sav_balance <<"\t$"<< 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
	std::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

	std::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);
}

[lsk]

Write your question or you don't have any?

[jascns1012]

Here are the errors that are given and I have no idea what to do.

error C2249: 'std::basic_ios<_Elem,_Traits>::operator =' : no accessible path to private member declared in virtual base 'std::basic_ios<_Elem,_Traits>'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 9.0\vc\include\ios(152) : see declaration of 'std::basic_ios<_Elem,_Traits>::operator ='
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> This diagnostic occurred in the compiler generated function 'std::basic_istream<_Elem,_Traits> &std::basic_istream<_Elem,_Traits>::operator =(const std::basic_istream<_Elem,_Traits> &)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]

1> error C2248: 'std::basic_streambuf<_Elem,_Traits>::operator =' : cannot access private member declared in class 'std::basic_streambuf<_Elem,_Traits>'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> c:\program files (x86)\microsoft visual studio 9.0\vc\include\streambuf(22) : see declaration of 'std::basic_streambuf<_Elem,_Traits>::operator ='
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> This diagnostic occurred in the compiler generated function 'std::basic_filebuf<_Elem,_Traits> &std::basic_filebuf<_Elem,_Traits>::operator =(const std::basic_filebuf<_Elem,_Traits> &)'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1>error C2664: 'void std::basic_ifstream<_Elem,_Traits>::open(const wchar_t *,std::ios_base::openmode,int)' : cannot convert parameter 1 from 'std::string' to 'const wchar_t *'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

1> error C2664: 'void std::basic_ofstream<_Elem,_Traits>::open(const wchar_t *,std::ios_base::openmode,int)' : cannot convert parameter 1 from 'std::string' to 'const wchar_t *'
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits<char>
1> ]
1> No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

The thing is I cant change the functions or anything in the Int main() but I can change anything with in the function prototypes. An example would be:

{
	// Open the file named filename
	// Make sure it exists
	// Return it as an input file stream

	// Put your code here
	std::ifstream ifile;

	ifile.open(filename);

	if(!ifile.is_open())
	{
		ifile.close();
	}
	else;
	{
		std::cout <<"unable to open file so Exiting .." << std::endl;
	}
	return ifile;
}

[cire]

Unless you're using a compiler that supports move semantics, the prototype and definitions of your GetInputFile and GetOutputFile are going to be a problem. From the error messages you posted, one can see you're using a compiler that was last updated in 2008, but move semantics were not added until C++11 (which, coincidentally, is when constructors for the fstream family of streams had an overload for std::string added.)

Update your compiler?

[jascns1012]

I hear what you are saying but this is for a school project and this is there software that they want to use. I'm not sure what to do I have changed the function prototype to all being void and the program works perfectly but my teacher uses a program that grades our program and it can tell if I don't use his template which is this:

#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
}

The only thing I can do is put in where it say code here. If you have an idea on how to do I would greatly appreciate it.

Thanks