Given the savingsAcct class, implement and test all member and friend functions

Question

Given the savingsAcct class, implement and test all member and friend functions of the class.

class savingsAcct

{

    friend istream& operator>>(istream&, savingsAcct&);

    friend ostream& operator<<(ostream&, const savingsAcct&);

public:

    savingsAcct();

    savingsAcct(string acctNum, double amt);

    // Postcondition: balance is set to the value passed to parameter amt

    static double * getAddressOfVar_annulRate();

    // Postcondition: return the address of static variable annualRate (should the same for all objects!)

    static double getAnnualRate();

    // Postcondition: returns annual interest rate

    static void setAnnualRate(double rate); // change the annual interest rate

    // Postcondition: annualRate has been changed to the value passed to parameter rate

    void computeIntrest();

    // Interest is computed at the end of each month using monthly interest rate (i.e.,annualRate/12)

         // Postcondition: interest is computed at the end of the month using the current balance

private:

    string acctNo;           // e.g., A1234

    double balance;

    static double annualRate;       // classwide; store in a memory location shared by all objects

    double interest;         // monthly interest

};

Note: The code for the main function is provided below along with a sample output to help you learn the concept and practices of static members of a class in a systematic way. Do note that a static variable must be initialized in file scope.

int main()

{

    cout << "As of now, no object has been declared. ";

    cout << "However, static data members exist before any object is declared:" << endl;

    cout << "   The address of its storage location: "

           << int(savingsAcct::getAddressOfVar_annulRate()) << endl;

    cout << "                  Annual interest rate: " << savingsAcct::getAnnualRate() * 100

           << "%" << endl << endl;

    cout << "Still no object has declared, we now set the interest rate to 1.5%." << endl;

    savingsAcct::setAnnualRate(0.015);

    cout << "    Now, the annual interest rate is: " << savingsAcct::getAnnualRate() * 100

           << "%" << endl << endl;

    cout << "We now declare and initialize 2 savingAcct objects." << endl;

    cout << "We also compute interest at the end of 1st month and display their cnotents: ";     

    savingsAcct s1("A1234", 5000), s2("A9876", 8000);

    s1.computeIntrest();

    s2.computeIntrest();

    cout << s1 << endl << endl;

    cout << s2 << endl << endl;

    cout << "We now display the address of static variable annualRate" << endl;

    cout << "   by calling "getAddressOfVar_annulRate()" member function" << endl << endl;

    cout << "Via s1: the address of "annualRate" is " << int(s1.getAddressOfVar_annulRate())

           << endl;

    cout << "Via s2: the address of "annualRate" is " << int(s2.getAddressOfVar_annulRate())

           << endl;

    cout << "Via s1: the address of "annualRate" is "

           << int(savingsAcct::getAddressOfVar_annulRate()) << endl;

    cout << " It should be quite clear that static members are indeed "class-wide!!!"" << endl;

    cout << "Note: calling a static member function, "this" pointer is not involved!!! ";

    return 0;

Explanation / Answer

Hi, Friend your output imahe is not visible(not uploaded properly) so i can not verify input.output.

Please let me know in case of any issue.

Please find my savingsAcct implementation.

#include <iostream>
#include "savingsAcct.h"
using namespace std;

savingsAcct::savingsAcct(){
   acctNo = "A123";
   balance = 0;
   annualRate = 0;
   interest = 0;
}
savingsAcct::savingsAcct(string acctNum, double amt){
   acctNo = acctNum;
   balance = amt;
}
  
double* savingsAcct::getAddressOfVar_annulRate(){
   return (double *)&annualRate;
}

double savingsAcct::getAnnualRate(){

return annualRate;
}
void savingsAcct::setAnnualRate(double rate){
annualRate = rate;
}
void savingsAcct::computeIntrest(){

   double r = annualRate/12;

   interest = r*balance;
}

istream& operator>>(istream& in, savingsAcct& acct){
   cout<<"Enter account number: ";
   in>>acct.acctNo;
   cout<<"Enter balance: ";
   in>>acct.balance;
   return in;
}
ostream& operator<<(ostream& out, const savingsAcct& acct){
   out<<"Account Number: "<<acct.acctNo<<endl;
   out<<"Balance: "<<acct.balance<<endl;
   return out;
}

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