我正在用C++编写一个与银行系统相关的程序。这是我的代码，我想在用户创建银行账户后用.txt创建一个输出文件。但问题是，当创建.txt输出文件时，文本文件中显示的输出看起来很奇怪。我该如何解决此问题？
#include<iostream>
#include<fstream>
#include<cctype>
#include<iomanip>
using namespace std;
class account
{
int acno;
char name[50];
int deposit;
char type;
public:
void create_account(); //function to get data from user
void show_account() const; //function to show data on screen
void modify(); //function to add new data
void dep(int); //function to accept amount and add to balance amount
void draw(int); //function to accept amount and subtract from balance amount
void report() const; //function to show data in tabular format
int retacno() const; //function to return account number
int retdeposit() const; //function to return balance amount
char rettype() const; //function to return type of account
}; //class ends here
void account::create_account()
{
cout<<"nEnter The account No. :";
cin>>acno;
cout<<"nnEnter The Name of The account Holder : ";
cin.ignore();
cin.getline(name,50);
cout<<"nEnter Type of The account (C/S) : ";
cin>>type;
type=toupper(type);
cout<<"nEnter The Initial amount(>=500 for Saving and >=1000 for current ) : ";
cin>>deposit;
cout<<"nnnAccount Created..";
}
void account::show_account() const
{
cout<<"nAccount No. : "<<acno;
cout<<"nAccount Holder Name : ";
cout<<name;
cout<<"nType of Account : "<<type;
cout<<"nBalance amount : "<<deposit;
}
void account::modify()
{
cout<<"nAccount No. : "<<acno;
cout<<"nModify Account Holder Name : ";
cin.ignore();
cin.getline(name,50);
cout<<"nModify Type of Account : ";
cin>>type;
type=toupper(type);
cout<<"nModify Balance amount : ";
cin>>deposit;
}
void account::dep(int x)
{
deposit+=x;
}
void account::draw(int x)
{
deposit-=x;
}
void account::report() const
{
cout<<acno<<setw(10)<<" "<<name<<setw(10)<<" "<<type<<setw(6)<<deposit<<endl;
}
int account::retacno() const
{
return acno;
}
int account::retdeposit() const
{
return deposit;
}
char account::rettype() const
{
return type;
}
//***************************************************************
// function declaration
//****************************************************************
void write_account(); //function to write record in binary file
void display_sp(int); //function to display account details given by user
void modify_account(int); //function to modify record of file
void delete_account(int); //function to delete record of file
void display_all(); //function to display all account details
void deposit_withdraw(int, int); // function to desposit/withdraw amount for given account
void intro(); //introductory screen function
//***************************************************************
// THE MAIN FUNCTION OF PROGRAM
//****************************************************************
int main()
{
char ch;
int num;
intro();
do
{
system("cls");
cout<<"nnntMAIN MENU";
cout<<"nnt01. NEW ACCOUNT";
cout<<"nnt02. DEPOSIT AMOUNT";
cout<<"nnt03. WITHDRAW AMOUNT";
cout<<"nnt04. BALANCE ENQUIRY";
cout<<"nnt05. ALL ACCOUNT HOLDER LIST";
cout<<"nnt06. CLOSE AN ACCOUNT";
cout<<"nnt07. MODIFY AN ACCOUNT";
cout<<"nnt08. EXIT";
cout<<"nntSelect Your Option (1-8) ";
cin>>ch;
system("cls");
switch(ch)
{
case '1':
write_account();
break;
case '2':
cout<<"nntEnter The account No. : "; cin>>num;
deposit_withdraw(num, 1);
break;
case '3':
cout<<"nntEnter The account No. : "; cin>>num;
deposit_withdraw(num, 2);
break;
case '4':
cout<<"nntEnter The account No. : "; cin>>num;
display_sp(num);
break;
case '5':
display_all();
break;
case '6':
cout<<"nntEnter The account No. : "; cin>>num;
delete_account(num);
break;
case '7':
cout<<"nntEnter The account No. : "; cin>>num;
modify_account(num);
break;
case '8':
cout<<"nntThanks for using bank managemnt system";
break;
default :cout<<"a";
}
cin.ignore();
cin.get();
}while(ch!='8');
return 0;
}
//***************************************************************
// function to write in file
//****************************************************************
void write_account()
{
account ac;
ofstream outFile;
outFile.open("account.txt",ios::binary|ios::app);
ac.create_account();
outFile.write(reinterpret_cast<char *> (&ac), sizeof(account));
outFile.close();
}
//***************************************************************
// function to read specific record from file
//****************************************************************
void display_sp(int n)
{
account ac;
bool flag=false;
ifstream inFile;
inFile.open("account.txt",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
return;
}
cout<<"nBALANCE DETAILSn";
while(inFile.read(reinterpret_cast<char *> (&ac), sizeof(account)))
{
if(ac.retacno()==n)
{
ac.show_account();
flag=true;
}
}
inFile.close();
if(flag==false)
cout<<"nnAccount number does not exist";
}
//***************************************************************
// function to modify record of file
//****************************************************************
void modify_account(int n)
{
bool found=false;
account ac;
fstream File;
File.open("account.txt",ios::binary|ios::in|ios::out);
if(!File)
{
cout<<"File could not be open !! Press any Key...";
return;
}
while(!File.eof() && found==false)
{
File.read(reinterpret_cast<char *> (&ac), sizeof(account));
if(ac.retacno()==n)
{
ac.show_account();
cout<<"nnEnter The New Details of account"<<endl;
ac.modify();
int pos=(-1)*static_cast<int>(sizeof(account));
File.seekp(pos,ios::cur);
File.write(reinterpret_cast<char *> (&ac), sizeof(account));
cout<<"nnt Record Updated";
found=true;
}
}
File.close();
if(found==false)
cout<<"nn Record Not Found ";
}
//***************************************************************
// function to delete record of file
//****************************************************************
void delete_account(int n)
{
account ac;
ifstream inFile;
ofstream outFile;
inFile.open("account.txt",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
return;
}
outFile.open("Temp.dat",ios::binary);
inFile.seekg(0,ios::beg);
while(inFile.read(reinterpret_cast<char *> (&ac), sizeof(account)))
{
if(ac.retacno()!=n)
{
outFile.write(reinterpret_cast<char *> (&ac), sizeof(account));
}
}
inFile.close();
outFile.close();
remove("account.txt");
rename("Temp.dat","account.dat");
cout<<"nntRecord Deleted ..";
}
//***************************************************************
// function to display all accounts deposit list
//****************************************************************
void display_all()
{
account ac;
ifstream inFile;
inFile.open("account.txt",ios::binary);
if(!inFile)
{
cout<<"File could not be open !! Press any Key...";
return;
}
cout<<"nnttACCOUNT HOLDER LISTnn";
cout<<"====================================================n";
cout<<"A/c no. NAME Type Balancen";
cout<<"====================================================n";
while(inFile.read(reinterpret_cast<char *> (&ac), sizeof(account)))
{
ac.report();
}
inFile.close();
}
//***************************************************************
// function to deposit and withdraw amounts
//****************************************************************
void deposit_withdraw(int n, int option)
{
int amt;
bool found=false;
account ac;
fstream File;
File.open("account.txt", ios::binary|ios::in|ios::out);
if(!File)
{
cout<<"File could not be open !! Press any Key...";
return;
}
while(!File.eof() && found==false)
{
File.read(reinterpret_cast<char *> (&ac), sizeof(account));
if(ac.retacno()==n)
{
ac.show_account();
if(option==1)
{
cout<<"nntTO DEPOSITE AMOUNT ";
cout<<"nnEnter The amount to be deposited";
cin>>amt;
ac.dep(amt);
}
if(option==2)
{
cout<<"nntTO WITHDRAW AMOUNT ";
cout<<"nnEnter The amount to be withdraw";
cin>>amt;
int bal=ac.retdeposit()-amt;
if((bal<500 && ac.rettype()=='S') || (bal<1000 && ac.rettype()=='C'))
cout<<"Insufficience balance";
else
ac.draw(amt);
}
int pos=(-1)*static_cast<int>(sizeof(ac));
File.seekp(pos,ios::cur);
File.write(reinterpret_cast<char *> (&ac), sizeof(account));
cout<<"nnt Record Updated";
found=true;
}
}
File.close();
if(found==false)
cout<<"nn Record Not Found ";
}
//***************************************************************
// INTRODUCTION FUNCTION
//****************************************************************
void intro()
{
cout<<"nnnt BANK";
cout<<"nntMANAGEMENT";
cout<<"nnt SYSTEM";
cout<<"nnnnMADE BY : your name";
cout<<"nnSCHOOL : your school name";
cin.get();
}
outFile.open("account.txt",ios::binary|ios::app);
这是问题的例子。如果想要纯文本文件，请删除代码中所有位置的ios::binary。
不过，使用纯文本文件的银行系统似乎非常不安全。