CVRs

//Lab 3 - Virtual Realities
//Justin Gonzalez
//CECS 424
//Due 3/23/2018

#include<stdio.h>
#include<stdlib.h>

struct Employee {
	void** vtable;
	int age;
};

struct HourlyEmployee {
	void** vtable;
	int age;
	double hourly_rate;
	double hours;
};

struct CommissionEmployee {
	void** vtable;
	int age;
	double hourly_rate;
	double hours;
	double sales_amount;
};

struct SeniorSalesman {
	void** vtable;
	int age;
	double hourly_rate;
	double hours;
	double sales_amount;
};

void Speak_Hourly(struct Employee* ptr)
{
	printf("I work for $%.2lf dollars per hour.\n", ((struct HourlyEmployee*)ptr)->hourly_rate);
}

void Speak_Commission(struct Employee* ptr)
{
	printf("I make commission on $%.2lf dollars in sales!\n", ((struct CommissionEmployee*)ptr)->sales_amount);
}

double GetPay_Hourly(struct Employee* ptr)
{
	return ((struct HourlyEmployee*)ptr)->hours * ((struct HourlyEmployee*)ptr)->hourly_rate;
}

double GetPay_Commission(struct Employee* ptr)
{
	return (((struct CommissionEmployee*)ptr)->sales_amount * .1) + 40000;
}

double GetPay_Senior(struct Employee* ptr)
{
	double srPay = (.2*((struct SeniorSalesman*)ptr)->sales_amount) + 50000;
	if (((struct SeniorSalesman*)ptr)->age >= 40)
		return srPay + ((.05*((struct SeniorSalesman*)ptr)->sales_amount));
	return srPay;
}
void* Vtable_Hourly[2] = { Speak_Hourly, GetPay_Hourly };
void* Vtable_Commission[2] = { Speak_Commission, GetPay_Commission };
void* Vtable_Senior[2] = { Speak_Commission, GetPay_Senior };

void Construct_Hourly(struct HourlyEmployee* ptr)
{
	ptr->age = 0;
	ptr->hourly_rate = 0;
	ptr->hours = 0;
	ptr->vtable = Vtable_Hourly;
}

void Construct_Commission(struct CommissionEmployee* ptr)
{
	ptr->age = 0;
	ptr->hourly_rate = 0;
	ptr->hours = 0;
	ptr->vtable = Vtable_Commission;
}

void Construct_Senior(struct SeniorSalesman* ptr)
{
	ptr->age = 0;
	ptr->hourly_rate = 0;
	ptr->hours = 0;
	ptr->vtable = Vtable_Senior;
}

int main()
{
	struct Employee *eptr;
	int numResp = 0;
	int choice = 0;
	int ageResp = 0;
	double payrateResp = 0.0;
	double hoursResp = 0.0;
	double salesResp = 0.0;
	do {
		printf("Choose one of the options by entering its corresponding number:");
		printf("\n1.Hourly Employee\n2.Commission Employee\n3.Senior Salesman\n");
		scanf_s("%d", &numResp);
		choice = numResp;
		switch (choice)
		{
		case 1:
			eptr = malloc(sizeof(struct HourlyEmployee));
			Construct_Hourly(eptr);
			printf("How old is this employee?\n");
			scanf_s("%d", &ageResp);
			printf("What is this employee's pay rate? (USD Per Hour)\n");
			scanf_s("%lf", &payrateResp);
			printf("How many hours has this employee worked?\n");
			scanf_s("%lf", &hoursResp);
			eptr->age = ageResp;
			((struct HourlyEmployee*)eptr)->hourly_rate = payrateResp;
			((struct HourlyEmployee*)eptr)->hours = hoursResp;
			free(eptr);
			break;
		case 2:
			eptr = malloc(sizeof(struct CommissionEmployee));
			Construct_Commission(eptr);
			printf("How old is this employee?\n");
			scanf_s("%d", &ageResp);
			eptr->age = ageResp;
			printf("How much in sales has this employee made?\n");
			scanf_s("%lf", &salesResp);
			((struct CommissionEmployee*)eptr)->sales_amount = salesResp;
			free(eptr);
			break;
		case 3:
			eptr = malloc(sizeof(struct SeniorSalesman));
			Construct_Senior(eptr);
			printf("How old is this employee?\n");
			scanf_s("%d", &ageResp);
			eptr->age = ageResp;
			printf("How much in sales has this employee made?\n");
			scanf_s("%lf", &salesResp);
			((struct SeniorSalesman*)eptr)->sales_amount = salesResp;
			free(eptr);
			break;
		default:
			printf("\nPlease choose a listed option.\n");
			break;
		}
	} while ((choice != 1) && (choice != 2) && ((choice != 3)));
	((void(*)(struct Employee*))eptr->vtable[0])((struct Employee*)eptr);
	printf("I have made %.2lf thus far.", ((double(*)(struct Employee*))eptr->vtable[1])((struct Employee*)eptr));
}