C++ for Dummies (3rd Edition)/C_FD.iso/BUDGETS/BUDGET3.CPP

C/C++ Source or Header | 1996-09-15 | 7KB | 279 lines

//BUDGET3.CPP - Budget program with real classes for
//              the first time. Now we transform the
//              C structs into classes. This is starting
//              to look like something.

#include <iostream.h>

//the maximum number of accounts one can have
const int maxAccounts = 10;

//Checking - this describes checking accounts
class Checking                         //Note 1
{
  public:
   Checking()                          //Note 2
   {
      accountNumber = 0;
      balance = 0.0F;
}
   void init()                         //Note 3
   {
      cout << "Enter account number:";
      cin  >> accountNumber;
   }

   //access functions                  //Note 4
   int accountNo()
   {
      return accountNumber;
   }
   float acntBalance()
   {
      return balance;
   }

   //transaction functions             //Note 5
   void deposit(float amount)
   {
      balance += amount;
   }
   void withdrawal(float amount);

   //display function for displaying self on æcoutÆ
   void display()                      //Note 6
   {
      cout << "Account " << accountNumber
           << " = "      << balance
           << "\n";
   }

  protected:                           //Note 7
   unsigned accountNumber;
   float    balance;
};
//withdrawal - this member function is too big to
//             be inlined
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
{
  public:
   Savings()
   {
      accountNumber = 0;
      balance = 0.0F;
      noWithdrawals = 0;
   }
   void init()
   {
      cout << "Enter account number:";
      cin  >> accountNumber;
   }

   //access functions
   int accountNo()
   {
      return accountNumber;
   }
   float acntBalance()
   {
      return balance;
   }

   //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:
   unsigned accountNumber;
   float    balance;
   int      noWithdrawals;
};
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
void process(Checking &checking);
void process(Savings &savings);

//checking and savings account objects
Checking chkAcnts[maxAccounts];        //Note 8
Savings svgAcnts[maxAccounts];

//main - accumulate the initial input and output totals
int main()
{
   /*loop until someone enters an æXÆ or æxÆ*/
   int noChkAccounts = 0;    //count the number of accounts
   int noSvgAccounts = 0;
   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':
            if (noChkAccounts < maxAccounts)
{
               chkAcnts[noChkAccounts].init(); //Note 9
               process(chkAcnts[noChkAccounts]);
               noChkAccounts++;
            }
            else
            {
               cout << "No more room for checking accounts\n";
            }
            break;

         case 's':
         case 'S':
            if (noSvgAccounts < maxAccounts)
            {
               svgAcnts[noSvgAccounts].init();
               process(svgAcnts[noSvgAccounts]);
               noSvgAccounts++;
            }
            else
            {
               cout << "No more room for savings accounts\n";
            }
            break;

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

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

   //now present totals
   float chkTotal = 0.0F;      //total of all checking accounts
   cout << "Checking accounts:\n";
   int i;
   for (i = 0; i < noChkAccounts; i++)
   {
      chkAcnts[i].display();           //Note 10
      chkTotal += chkAcnts[i].acntBalance();
   }
   float svgTotal = 0.0F;      //total of all savings accounts
   cout << "Savings accounts:\n";
   for (i = 0; i < noSvgAccounts; i++)
   {
      svgAcnts[i].display();
      svgTotal += svgAcnts[i].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;
}

//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)
      {
         savings.withdrawal(-transaction);
      }
   } while (transaction != 0.0F);
}