Classes

The Candidate Class

#include <string>
using namespace std;

class Candidate
{
    private:
        string name;
        string party; 
        int polls;
    public:
        Candidate();
        Candidate(string name, string party, int polls);
        void setCandidate(string name, string party, int polls);
        void setPolls(int polls);

        string getName();
        string getParty();
        int getPolls();
        void print();
};

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

Candidate :: Candidate() {
    name = "";
    party = "";
    polls = 0;
}
Candidate :: Candidate(string theName, string theParty, int thePolls) {
    name = theName;
    party = theParty;
    polls = thePolls;
}
void Candidate :: setCandidate(string theName, string theParty, int thePolls) {
    name = theName;
    party = theParty;
    polls = thePolls;
}
string Candidate :: getName() {
    return name;
}
int Candidate :: getPolls() {
    return polls;
}
void Candidate :: setPolls(int thePolls) {
    polls = thePolls;
}
void Candidate :: print(){
    cout << "Name : " << name << endl;
    cout << "Party : " << party << endl;
    cout << "Polls : " << polls << "%" << endl;
}

int main() {
    Candidate h("Hillary Clinton","Democrat",46);
    Candidate j("Jill Stein","Green",3);
    
    h.print();
    j.print();
    
    h.setPolls(12);
    j.setPolls(52);
    
    h.print();
    j.print();
    
}

 

The Date Class

#include < stream.h > #include < math.h > #include < stdlib.h >

int max (int a, int b) { if (a>b) return(a) ; else return (b); }

int min (int a, int b) { if (a>b) return(b); else return (a); }

class Date { public: Date (); Date ( int mn, int day, int yr); // constructor void display(); // function to display date int GetMonth(); void SetMonth(int mn); ~Date(); private: int month, day, year; int DaysSoFar(); };

// constructor definition Date::Date () { month = day = year = 1; }

Date::Date (int mn, int dy, int yr) { static int length[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

month = max(1, mn); month = min(month,12);

day = max(1,dy); day = min(day, length[month]);

year = max(1, yr); }

void Date::display() { static char *name[] = {"nothing", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };

cout << '\n' << name[month] << ' ' << day << "," << year << '\n'; cout << "Days so far: " << DaysSoFar() << '\n'; }

Date::~Date() { cout << "Thank You for using DateLine Services and have a nice date\n"; }

int Date::DaysSoFar() { int total = 0; static int length[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

for (int i=1; i < month; i++) total += length[i]; total += day; return (total); }

int Date::GetMonth() { return month; }

void Date::SetMonth(int mn) { month = max(1, mn); month = min(month, 12); }

void main() { Date mydate(1, 2, 1993); Date date2(4,12,1994); Date date4; Date *date3; Date *date6; Date date5(1,1,1);

date3 = new Date(45,45,44545);

mydate.display(); date2.display(); date3->display();

cout << "OK: " << date3->GetMonth() << '\n'; date3->SetMonth(4); cout << "OK: " << date3->GetMonth() << '\n';

delete(date3); date6 = new Date(1,1,1);

cout << "OK: " << date3->GetMonth() << '\n'; date3->SetMonth(4); cout << "OK: " << date3->GetMonth() << '\n';

date3->display();

date4.display();

date5.SetMonth(3); delete(date6); } %ENDCODE%

The BankAccount Class

//DISPLAY 10.5 The BankAccount Class 
//Program to demonstrate the class BankAccount.
#include <iostream>
using namespace std;

//Class for a bank account:
class BankAccount
{
public:
    void set(int dollars, int cents, double rate);
    //Postcondition: The account balance has been set to $dollars.cents;
    //The interest rate has been set to rate percent.

    void set(int dollars, double rate);
    //Postcondition: The account balance has been set to $dollars.00.
    //The interest rate has been set to rate percent.

    void update( );
    //Postcondition: One year of simple interest has been
    //added to the account balance.

    double get_balance( );
    //Returns the current account balance.

    double get_rate( );
    //Returns the current account interest rate as a percentage.

    void output(ostream& outs);
    //Precondition: If outs is a file output stream, then
    //outs has already been connected to a file.
    //Postcondition: Account balance and interest rate have  
    //been written to the stream outs.
private:
    double balance;
    double interest_rate;

    double fraction(double percent);
    //Converts a percentage to a fraction. For example, fraction(50.3) 
    //returns 0.503.
};

int main( )
{
    BankAccount account1, account2;
    cout << "Start of Test:\n";
    account1.set(123, 99, 3.0);
    cout << "account1 initial statement:\n";
    account1.output(cout);
    account1.set(100, 5.0);



cout << "account1 with new setup:\n";
    account1.output(cout);

    account1.update( );
    cout << "account1 after update:\n";
    account1.output(cout);

    account2 = account1;
    cout << "account2:\n";
    account2.output(cout);
    return 0;
}

void BankAccount::set(int dollars, int cents, double rate)
{
    if ((dollars < 0) || (cents < 0) || (rate < 0))
    {
        cout << "Illegal values for money or interest rate.\n";
    }

    balance = dollars + 0.01*cents;
    interest_rate = rate;
}

void BankAccount::set(int dollars, double rate)
{
    if ((dollars < 0) || (rate < 0))
    {
        cout << "Illegal values for money or interest rate.\n";
    }

    balance = dollars;
    interest_rate = rate;
}

void BankAccount::update( )
{
    balance = balance + fraction(interest_rate)*balance;
}

double BankAccount::fraction(double percent_value)
{
    return (percent_value/100.0);
}



double BankAccount::get_balance( )
{
    return balance;
}

double BankAccount::get_rate( )
{
    return interest_rate;
}

//Uses iostream:
void BankAccount::output(ostream& outs)
{
    outs.setf(ios::fixed);
    outs.setf(ios::showpoint);
    outs.precision(2);
    outs << "Account balance $" << balance << endl;
    outs << "Interest rate " << interest_rate << "%" << endl;
}

 

Alternative BankAccount Class Implementation

//DISPLAY 10.6 /Program to demonstrate the class BankAccount.
//Demonstrates an alternative implementation of the class BankAccount.
#include <iostream>
using namespace std;

//Class for a bank account:
class BankAccount
{
public:
    BankAccount(int dollars, int cents, double rate);
    //Initializes the account balance to $dollars.cents and
    //initializes the interest rate to rate percent.

    BankAccount(int dollars, double rate);
    //Initializes the account balance to $dollars.00 and
    //initializes the interest rate to rate percent.

    BankAccount( );
    //Initializes the account balance to $0.00 and the interest rate to 0.0%.

    void update( );
    //Postcondition: One year of simple interest has been added to the account 
    //balance.

    double get_balance( );
    //Returns the current account balance.

    double get_rate( );
    //Returns the current account interest rate as a percentage.

    void output(ostream& outs);
    //Precondition: If outs is a file output stream, then
    //outs has already been connected to a file.
    //Postcondition: Account balance and interest rate 
    //have been written to the stream outs.
private:
    double balance;
 double interest_rate;
 double fraction(double percent);
 //Converts a percentage to a fraction. For example, fraction(50.3)
 //returns 0.503.

};

int main( )
{
    BankAccount account1(100, 2.3), account2;

    cout << "account1 initialized as follows:\n";
    account1.output(cout);
    cout << "account2 initialized as follows:\n";
    account2.output(cout);

    account1 = BankAccount(999, 99, 5.5);
    cout << "account1 reset to the following:\n";
    account1.output(cout);
    return 0;
}

BankAccount::BankAccount(int dollars, int cents, double rate)
{
    if ((dollars < 0) || (cents < 0) || (rate < 0))
    {
        cout << "Illegal values for money or interest rate.\n";
    }
  balance = dollars + 0.01*cents;
 interest_rate = rate;
}

BankAccount::BankAccount(int dollars, double rate)
{
 if ((dollars < 0) || (rate < 0))
 {
 cout << "Illegal values for money or interest rate.\n";
 }
 balance = dollars;
 interest_rate = rate;
}


BankAccount::BankAccount( )  : balance(0), interest_rate(0.0)
{
    //Body intentionally empty.
}

//Uses iostream:
void BankAccount::output(ostream& outs)
{
    outs.setf(ios::fixed);
    outs.setf(ios::showpoint);
    outs.precision(2);
    outs << "Account balance $" << balance << endl;
    outs << "Interest rate " << interest_rate << "%" << endl;
}



 

Alternative BankAccount Class Implementation

//DISPLAY 10.7 Alternative BankAccount Class Implementation
//Demonstrates an alternative implementation of the class BankAccount.
#include <iostream>
#include <cmath>
using namespace std;

//Class for a bank account:
class BankAccount
{
public:
    BankAccount(int dollars, int cents, double rate);
    //Initializes the account balance to $dollars.cents and
    //initializes the interest rate to rate percent.

    BankAccount(int dollars, double rate);
    //Initializes the account balance to $dollars.00 and
    //initializes the interest rate to rate percent.

    BankAccount( );
    //Initializes the account balance to $0.00 and the interest rate to 0.0%.

    void update( );
    //Postcondition: One year of simple interest has been added to the account 
    //balance.

    double get_balance( );
    //Returns the current account balance.

    double get_rate( );
    //Returns the current account interest rate as a percentage.

    void output(ostream& outs);
    //Precondition: If outs is a file output stream, then
    //outs has already been connected to a file.
    //Postcondition: Account balance and interest rate 
    //have been written to the stream outs.
private:
    int dollars_part;
    int cents_part;
    double interest_rate;//expressed as a fraction, for example, 0.057 for 5.7%

    double fraction(double percent);
    //Converts a percentage to a fraction. For example, fraction(50.3) 
    //returns 0.503.

    double percent(double fraction_value);
    //Converts a fraction to a percentage. For example, percent(0.503)
    //returns 50.3.
};

int main( )
{
    BankAccount account1(100, 2.3), account2;

    cout << "account1 initialized as follows:\n";
    account1.output(cout);
    cout << "account2 initialized as follows:\n";
    account2.output(cout);

    account1 = BankAccount(999, 99, 5.5);
    cout << "account1 reset to the following:\n";
    account1.output(cout);
    return 0;
}

BankAccount::BankAccount(int dollars, int cents, double rate)
{
    if ((dollars < 0) || (cents < 0) || (rate < 0))
    {
        cout << "Illegal values for money or interest rate.\n";
    }
    dollars_part = dollars;
    cents_part = cents;
    interest_rate = fraction(rate);
}

BankAccount::BankAccount(int dollars, double rate)
{
    if ((dollars < 0) || (rate < 0))
    {
        cout << "Illegal values for money or interest rate.\n";
    }
    dollars_part = dollars;
    cents_part = 0;
    interest_rate = fraction(rate);
}

BankAccount::BankAccount( ) : dollars_part(0), cents_part(0), interest_rate(0.0)
{
    //Body intentionally empty.
}


double BankAccount::fraction(double percent_value)
{
    return (percent_value/100.0);
}

//Uses cmath:
void BankAccount::update( )
{
    double balance = get_balance( );
    balance = balance + interest_rate*balance;
    dollars_part = floor(balance);
    cents_part = floor((balance - dollars_part)*100);
}

double BankAccount::get_balance( )
{
    return (dollars_part + 0.01*cents_part);
}

double BankAccount::percent(double fraction_value)
{
    return (fraction_value*100);
}

double BankAccount::get_rate( )
{
    return percent(interest_rate);
}

//Uses iostream:
void BankAccount::output(ostream& outs)
{
    outs.setf(ios::fixed);
    outs.setf(ios::showpoint);
    outs.precision(2);
    outs << "Account balance $" << get_balance( ) << endl;
    outs << "Interest rate " << get_rate( ) << "%" << endl;
}

 



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Topic revision: r3 - 2017-04-11 - JimSkon
 
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