C++ for Dummies (3rd Edition)/C_FD.iso/BUDGETS/BUDGET4.CPP

C/C++ Source or Header | 1996-09-15 | 8KB | 368 lines

//BUDGET4.CPP - Budget program with expanded constructors,
//              new (and improved) heap management, and
//              static members. The Checking and Savings
//              classes should have a destructor to remove
//              the object from the list, but the destructors
//              arenÆt included to save space.

#include <iostream.h>
#include <stdlib.h>

//Checking - this describes checking accounts
class Checking
{
  protected:
   Checking(Checking &c)
   {
      cout << "No creating funds\n";
   }

  public:                              //Note 1
   Checking(unsigned accNo, float initialBalance = 0.0F);

   //access functions
   int accountNo()
   {
      return accountNumber;
   }
   float acntBalance()
   {
      return balance;
   }
   static Checking *first()
   {
      return pFirst;
   }
   Checking *next()
   {
      return pNext;
   }
   static int noAccounts()
   {
      return count;
   }

   //transaction functions
   void deposit(float amount)
   {
      balance += amount;
   }
   void withdrawal(float amount);

   //display function for displaying self on æcoutÆ
   void display()
   {
      cout << "Account " << accountNumber
           << " = "      << balance
           << "\n";
   }

  protected:
   //keep accounts in a linked list so thereÆs no limit
   static Checking *pFirst;            //Note 2
          Checking *pNext;

   static int count;         //number of accounts
   unsigned   accountNumber;
   float      balance;
};

//allocate space for statics
Checking *Checking::pFirst = 0;        //Note 3
int       Checking::count  = 0;

//define constructor
Checking::Checking(unsigned accNo, float initialBalance)
{
   accountNumber = accNo;
   balance = initialBalance;

   //add this to end of list and count it
   count++;
   Checking *pC;
   if (pFirst == 0)                    //Note 4
   {
      pFirst = this;      //empty list; make it first
   }
   else                   //list not empty; look for last
   {
      for (pC = pFirst; pC->pNext; pC = pC->pNext)
      {                   //do nothing (weÆre just looking...
      }                   //...for the last element in the list)
      pC->pNext = this;   //tack us onto end
   }
   pNext = 0;             //weÆre always last
}

//withdrawal - now the withdrawal function
void Checking::withdrawal(float amount)
{
   if (balance < amount )
   {
      cout << "Insufficient funds: balance " << balance
           << ", check "                     << amount
           << "\n";
   }
   else
   {
      balance -= amount;
      //if balance falls too low, charge service fee
      if (balance < 500.00F)
      {
         balance -= 0.20F;
      }
   }
}

//Savings - you can probably figure this one out
class Savings
{
  protected:
   Savings(Savings &s)
   {
      cout << "No creating funds\n";
   }

  public:
   Savings(unsigned accNo, float initialBalance = 0.0F);

   //access functions
   int accountNo()
   {
      return accountNumber;
   }
   float acntBalance()
   {
      return balance;
   }
   static Savings *first()
   {
      return pFirst;
   }
   Savings *next()
   {
      return pNext;
   }
   static int noAccounts()
   {
      return count;
   }

   //transaction functions
   void deposit(float amount)
   {
      balance += amount;
   }
   void withdrawal(float amount);

   //display function - display self to cout
   void display()
   {
      cout << "Account "             << accountNumber
           << " = "                  << balance
           << " (no. withdrawals = " << noWithdrawals
           << ")\n";
   }

  protected:
   //keep savings accounts in linked list as well
   static Savings *pFirst;
          Savings *pNext;

   static int count;           //number of accounts
   unsigned   accountNumber;
   float      balance;
   int        noWithdrawals;
};

//allocate space for statics
Savings *Savings::pFirst = 0;
int      Savings::count  = 0;

//define constructor
Savings::Savings(unsigned accNo, float initialBalance)
{
   accountNumber = accNo;
   balance = initialBalance;
   noWithdrawals = 0;

   //add this to end of list and count it
   count++;
   Savings* pS;
   if (pFirst == 0)
   {
      pFirst = this;         //empty list; make it first
   }
   else                      //list not empty; look for last
   {
      for (pS = pFirst; pS->pNext; pS = pS->pNext)
      {
      }
      pS->pNext = this;      //make last point to us
   }
   pNext = 0;                //and we point to nothing
}

//withdrawal - perform a Savings withdrawal
void Savings::withdrawal(float amount)
{
   if (balance < amount)
   {
      cout << "Insufficient funds: balance " << balance
           << ", withdrawal "                << amount
           << "\n";
   }
   else
   {
      if (++noWithdrawals > 1)
      {
         balance -= 5.00F;
      }
      balance -= amount;
   }
}

//prototype declarations
unsigned getAccntNo();
void process(Checking &checking);
void process(Savings &savings);
void outOfMemory();

//main - accumulate the initial input and output totals
int main()
{
   /*loop until someone enters an æXÆ or æxÆ*/
   Checking *pC;
   Savings  *pS;

   char     accountType;     //S or C

   unsigned keepLooping = 1;
   while (keepLooping)
   {
      cout << "Enter S for Savings, "
              "C for Checking, X for exit\n";
      cin  >> accountType;

      switch (accountType)
      {
         case 'c':
         case 'C':                     //Note 5
            pC = new Checking(getAccntNo());
            if (pC == 0)
            {
               outOfMemory();
            }
            process(*pC);
            break;

         case 's':
         case 'S':                     //Note 5
            pS = new Savings(getAccntNo());
            if (pS == 0)
            {
               outOfMemory();
            }
            process(*pS);
            break;

         case 'x':
         case 'X':
            keepLooping = 0;
            break;

         default:
            cout << "I didn't get that.\n";
      }
   }

   //now present totals
   float chkTotal = 0.0F;
   float svgTotal = 0.0F;
   cout << "Checking accounts:\n";     //Note 6
   for (pC = Checking::first(); pC; pC = pC->next())
   {
      pC->display();
      chkTotal += pC->acntBalance();
   }
   cout << "Savings accounts:\n";      //Note 6
   for (pS = Savings::first(); pS; pS = pS->next())
   {
      pS->display();
      svgTotal += pS->acntBalance();
   }

   float total = chkTotal + svgTotal;
   cout << "Total for checking accounts = " << chkTotal << "\n";
   cout << "Total for savings accounts  = " << svgTotal << "\n";
   cout << "Total worth                 = " << total << "\n";
   return 0;
}

//getAccntNo - return the account number entered
unsigned getAccntNo()
{
   unsigned accntNo;
   cout << "Enter account number:";
   cin  >> accntNo;
   return accntNo;
}

//process(Checking) - input the data for a checking account*/
void process(Checking &checking)
{
   cout << "Enter positive number for deposit,\n"
           "negative for check, 0 to terminate";

   float transaction;
   do
   {
      cout << ":";
      cin  >> transaction;

      //deposit
      if (transaction > 0.0F)
      {
         checking.deposit(transaction);
      }

      //withdrawal
      if (transaction < 0.0F)
      {
         checking.withdrawal(-transaction);
      }
   } while (transaction != 0.0F);
}
//process(Savings) - input the data for a savings account
void process(Savings &savings)
{
   cout << "Enter positive number for deposit,\n"
           "negative for withdrawal, 0 to terminate";

   float transaction;
   do
   {
      cout << ":";
      cin  >> transaction;

      //deposit
      if (transaction > 0.0F)
      {
         savings.deposit(transaction);
      }

      //withdrawal
      if (transaction < 0.0F)
      {
         s