Question

C++ Question

Modify the class by changing private members to protected members and viewing Account class as a base class. Define two derived classes Checking and RRSP. The Checking class has one additional private data: total(double). It has five public member functions: a constructor Checking (string n, string addr, double b, int p, double tot) (note you must call base constructor by using initialization list), double getTotal() to return total, void setTotal() to updata data, void withdraw(double w) which requires w ≤ total, if the condition is satisfied, the balance should be reduced by w dollars, otherwise, output message “invalid withdraw”. It also has a print function (first call base print function defined in Part 1 and then print Total: $1010.23). RRSP class has additional private data rate(double) and four public member functions: a constructor RRSP (string n, string addr, double b, int a, double r), void deposit(double w) which requires w ≤ total, if the condition is satisfied, then total reduced by w dollars, otherwise, output message “invalid withdraw”, void calInterest() to calculate the interest (=(balance-getTotal())*rate) and add it to the balance in base class (here we assume the total in RRSP account is balance – total). and a print function (first call base print function defined in Part 1 and then print Interest Rate: 2.5% \n Total: balance-getTotal()). In the main function, declare one Checking and one RRSP objects with some data. Call print function for both objects. Call withdraw function with some amount for Checking object and call deposit and calInterest functions for RRSP object. Call print function for both objects again.

Answer 1

CODE:

#include <iostream>
using namespace std;
//account class, BASE class
class Account
{
    //defined all members protected
protected:
    string n;
    string addr;
    double b;
    int p;
    //constructor of Account class
    Account(string s1, string s2, double d, int i)
    {
        n = s1;
        addr = s2;
        b = d;
        p = i;
    }
public:
    //print function prints all the data
    void print()
    {
        cout<<"Name: "<<n<<endl
            <<"Address: "<<addr<<endl
            <<"b: "<<b<<endl
            <<"p: "<<p<<endl;
    }
};
//checking class
class Checking : public Account
{
    //one extra variable "total"
    double total;
public:
    //parameterized constructor assigns the value of total and pas the rest of them to account class constructor
    Checking(string s1, string s2, double d, int i, double t) : Account(s1, s2, d, i)
    {
        total = t;
    }
    //returns total
    double getTotal()
    {
        return total;
    }
    //sets the value of total
    void setTotal(double d)
    {
        total = d;
    }
    //prints all the data
    void print()
    {
        Account::print();
        cout<<"Total: $"<<total<<endl;
    }
    //withdraw function withdraws from the total if possible, otherwise prints an error message
    void withdraw(double w)
    {
        if(w > total)
            cout<<"invalid withdraw\n";
        else
            total -= w;
    }
};
//RRSP class, CHILD class of Account class
class RRSP : public Account
{
    //one extra variable "rate"
    double rate;
public:
    //parameterized constructor initializes rate, passes rest to Account class constructor
    RRSP(string s1, string s2, double d, int i, double r) : Account(s1, s2, d, i)
    {
        rate = r;
    }
    //deposit function adds in "b" of account class
    void deposit(double d)
    {
        Account::b += d;
    }
    //calculates and adds interest in "b" of Account class
    void calIntrest()
    {
        double intrest = Account::b * rate;
        Account::b += intrest;
    }
    //prints all the details of RRSP variable
    void print()
    {
        Account::print();
        cout<<"Rate: "<<rate<<endl;
    }
};
int main()
{
    // define one variable for each class
    Checking c("John","washington DC", 12000, 25000, 35000);
    RRSP r("Farad","washington DC", 12000, 25000, 0.02);
    //print their value, then manipulate as asked then again print their values
    c.print();
    r.print();
    c.withdraw(2500);
    r.deposit(2500);
    r.calIntrest();
    c.print();
    r.print();
    return 0;
}

OUTPUT:

Name: John
Address: washington DC
b: 12000
p: 25000
Total: $35000
Name: Farad
Address: washington DC
b: 12000
p: 25000
Rate: 0.02
Name: John
Address: washington DC
b: 12000
p: 25000
Total: $32500
Name: Farad
Address: washington DC
b: 14790
p: 25000
Rate: 0.02

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