#include <ios>
#include <iostream>
#include <iomanip>
#include <limits>
#include <stdexcept>
#include <string>
 
class Account {
  std::string _name;
 
  // Represented by the number of pennies, so on a
  // 32-bit system these accounts are limited to
  // $42,949,672.96. Beware arithmetic overflow
  unsigned long _balance;
public:
  Account(): _balance ( 0 ) {}
 
  Account ( std::string name, unsigned long initial_balance )
    : _name ( name ), _balance ( initial_balance )
  {}
 
  std::string Name() const
  {
    return _name;
  }
 
  unsigned long Balance() const
  {
    return _balance;
  }
 
  unsigned long Credit ( unsigned long amount )
  {
    return _balance += amount;
  }
 
  unsigned long Debit ( unsigned long amount )
  {
    if ( amount > _balance ) {
      throw std::runtime_error ( 
        "Cannot debit more than the account contains" );
    }
 
    return _balance -= amount;
  }
 
  friend std::ostream& operator<< ( std::ostream& out, const Account& acct )
  {
    return out<< acct._name <<": "<< acct._balance / 100 <<"."
      << std::setfill ( '0' ) << std::setw ( 2 ) << acct._balance % 100;
  }
};
 
int main()
{
  Account accts[10];
  int n = 0;
 
  while ( true ) {
    std::cout<<"> ";
 
    std::string command;
 
    if ( !getline ( std::cin, command ) || command == "q" )
      break;
 
    if ( command == "new" ) {
      std::string name;
      unsigned long balance;
 
      std::cout<<"Name: ";
      getline ( std::cin, name );
 
      std::cout<<"Balance: ";
      std::cin>> balance;
      std::cin.ignore();
 
      accts[n++] = Account ( name, balance );
    }
    else if ( command == "credit" ) {
      std::string name;
      unsigned long amount;
 
      std::cout<<"Account name: ";
      getline ( std::cin, name );
 
      std::cout<<"Amount to debit: ";
      std::cin>> amount;
      std::cin.ignore();
 
      for ( int i = 0; i < n; i++ ) {
        if ( accts[i].Name() == name ) {
          try {
            accts[i].Debit ( amount );
          } catch ( std::exception& ex ) {
            std::cout<< ex.what() <<'\n';
          }
        }
      }
    }
    else if ( command == "debit" ) {
      std::string name;
      unsigned long amount;
 
      std::cout<<"Account name: ";
      getline ( std::cin, name );
 
      std::cout<<"Amount to credit: ";
      std::cin>> amount;
      std::cin.ignore();
 
      for ( int i = 0; i < n; i++ ) {
        if ( accts[i].Name() == name )
          accts[i].Credit ( amount );
      }
    }
    else if ( command == "report" ) {
      for ( int i = 0; i < n; i++ )
        std::cout<< accts[i] <<'\n';
    }
    else
      std::cout<<"Unrecognized command\n";
  }
}