#include <iostream>
using namespace std;
#include	<string.h>
#define NOI(_arr)	(sizeof(_arr)/sizeof(_arr[0]))

typedef const char * String;
typedef unsigned short ushort;

class Person{
  public:
	String Name;
	Person(String name):Name(name){}
};
class Student:public Person{
  public:
	float	CGPA;
	Student(String name, float cgpa):Person(name),CGPA(cgpa){
	}	
	//Student():Name(""),CGPA(0.0F){
	Student():Student("",0.0F){
	}
};
class Staff:public Person{
  protected:
	const double EPF_CONTRIBUTION=0.11;
  public:
	double	Salary;
	Staff(String name, double salary):Person(name),Salary(salary){
	}
	virtual double getMonthlySalary()=0;
};

class Lecturer:public Staff{
  public:
	float	Allowance;
	Lecturer(String name, double salary, float allowance):
		Staff(name,salary),Allowance(allowance){
	}
	double getMonthlySalary(){//The operation
		return (1.0-EPF_CONTRIBUTION)*Salary + Allowance;//The Method!
	}
};

class Clerk:public Staff{
  public:
	ushort	OTHours;
	float	OTRate;
	Clerk(String name, double salary, float otRate):
		Staff(name,salary),OTRate(otRate){
		OTHours = 0;
	}
	double getMonthlySalary(){//The operation
		return (1.0-EPF_CONTRIBUTION)*Salary + (OTRate*OTHours);//The Method!
	}
};

class Manager:public Staff{
  public:
	float CarAllowance;
	Manager(String name, double salary, float carAllowance):
		Staff(name,salary),CarAllowance(carAllowance){
		}
	double getMonthlySalary(){//The operation
		return (1.0-EPF_CONTRIBUTION)*Salary + CarAllowance;//The Method!
	}
};

class HRManager:public Manager{
  public:
	HRManager(String name, double salary):Manager(name,salary,500.0F){
	}
};

class SalesManager:public Manager{
  public:
	float 	PetrolAllowance;
	double 	MonthlySales;
	SalesManager(String name, double salary, 
		float carAllowance,float petrolAllowance):
			Manager(name,salary,carAllowance),
			PetrolAllowance(petrolAllowance),MonthlySales(0.0){
	}	
	double getMonthlySalary(){//The operation
		return (1.0-EPF_CONTRIBUTION)*(0.6*Salary) + (0.1*MonthlySales) + 
			CarAllowance + PetrolAllowance;//The Method!
	}
};

typedef bool (*Swap)(Staff* ,Staff*);

void ShowManagerInfo(Manager *m){
	cout<<"Monthly Salary:$"<<m->getMonthlySalary()<<"\tName:"<<m->Name<<endl;
}
void showStaffInfo(Staff **ss,int noi){
	for(int i=0;i<noi;i++){
		cout<<"Monthly Salary:$"<<ss[i]->getMonthlySalary()<<
			"\tName:"<<ss[i]->Name<<endl;
	}
	cout<<endl;
}
void sortStaff(Staff **ss,int noi,Swap swap){
	for(int x=0;x<(noi-1);x++){
		for(int y=0;y<(noi-1-x);y++){
			if(swap(ss[y],ss[y+1])){
				Staff *s = ss[y];
				ss[y] = ss[y+1];
				ss[y+1] = s;
			}
		}
	}
}

bool bySalary(Staff *lhs,Staff *rhs){
	return lhs->getMonthlySalary()>rhs->getMonthlySalary();
}

bool bySalaryDesc(Staff *lhs,Staff *rhs){
	return lhs->getMonthlySalary()<rhs->getMonthlySalary();
}

bool byName(Staff *lhs,Staff *rhs){
	return strcmp(lhs->Name,rhs->Name)>0;
}

int main(){
	Staff *staff[]={
		new Lecturer    ("Low Mai Kai",4500,450.0F),
		new Clerk       ("Low Mee",2500,25.0F),
		new Manager     ("Yong Tau Foo",5000,700),
		new HRManager   ("Chow Kui Teao",5500),
		new SalesManager("Low See Fun",4000,600,800),
	};
	showStaffInfo(staff,NOI(staff));
	sortStaff(staff,NOI(staff),bySalary);
	showStaffInfo(staff,NOI(staff));
	sortStaff(staff,NOI(staff),bySalaryDesc);
	showStaffInfo(staff,NOI(staff));
	sortStaff(staff,NOI(staff),byName);
	showStaffInfo(staff,NOI(staff));

	for(int i=0;i<NOI(staff);i++) delete staff[i];
	return 0;
}