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YourClass yetAnotherObject( ); anObject = YourClass(99, B ); anObject = YourClass( ); anObject = YourClass;
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Display 72 contains the definition of a class representing a simple bank account embedded in a small demonstration program A bank account of this form has two pieces of data: the account balance and the interest rate Note that we have represented the account balance as two values of type int, one for the dollars and one for the cents This illustrates the fact that the internal representation of the data need not be simply a member variable for each conceptual piece of data It may seem that the balance should be represented as a value of type double, rather than two int values However, an account contains an exact number of dollars and cents, and a value of type double is, practically speaking, an approximate quantity Moreover, a balance such as $32352 is not a dollar sign in front of a floating-point value The $32352 cannot have any more or fewer than two digits after the decimal point You cannot have a balance of $323523, and a member variable of type double would allow such a balance It is not impossible to have an account with fractional cents It is just not what we want for a bank account Note that the programmer who is using the class BankAccount can think of the balance as a value of type double or as two values of type int (for dollars and cents) The accessor and mutator functions allow the programmer to read and set the balance as either a double or two ints The programmer who is using the class need not and should not think of any underlying member variables That is part of the implementation that is hidden from the programmer using the class Note that the mutator function setBalance, as well as the constructor names, are overloaded Also note that all constructors and mutator functions check values to make sure they are appropriate For example, an interest rate cannot be negative A balance can be negative, but you cannot have a positive number of dollars and a negative number of cents This class has four private member functions: dollarsPart, centsPart, round, and fraction These member functions are made private because they are only intended to be used in the definitions of other member functions
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Display 72 BankAccount Class (part 1 of 5)
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 #include <iostream> #include <cmath> #include <cstdlib> using namespace std; //Data consists of two items: an amount of money for the account balance //and a percentage for the interest rate class BankAccount { public: BankAccount(double balance, double rate); //Initializes balance and rate according to arguments BankAccount(int dollars, int cents, double rate); //Initializes the account balance to $dollarscents For a negative balance both //dollars and cents must be negative Initializes the interest rate to rate percent BankAccount(int dollars, double rate); //Initializes the account balance to $dollars00 and //initializes the interest rate to rate percent BankAccount( ); //Initializes the account balance to $000 and the interest rate to 00% void update( ); //Postcondition: One year of simple interest has been added to the account void input( ); void output( ); double getBalance( ); int getDollars( ); int getCents( ); double getRate( );//Returns interest rate as a percentage void setBalance(double balance); void setBalance(int dollars, int cents); //Checks that arguments are both nonnegative or both nonpositive void setRate(double newRate); //If newRate is nonnegative, it becomes the new rate Otherwise, abort program private: //A negative amount is represented as negative dollars and negative cents //For example, negative $450 sets accountDollars to -4 and accountCents to -50 int accountDollars; //of balance int accountCents; //of balance double rate;//as a percent
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