Learning C with Jordan

pizza.c

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

//  Function Prototypes
int size_menu(void);
int top_menu(void);
void clear(void);
void InitStructs(struct PizzaCosts *Costs, struct StuffBought *Totals);
void Order(struct PizzaCosts *Costs, struct StuffBought *Totals);
int PrintReceipt(struct PizzaCosts *Costs, struct StuffBought *t);
int AskAgain(void);
//  End of Function Prototypes

void main(void)
{
        do {
        struct PizzaCosts Cost;
        struct StuffBought Total;
        struct PizzaCosts  *Costs;
        struct StuffBought *Totals;
        Costs = &Cost;
        Totals= &Total;
        InitStructs(Costs, Totals);
        Order(Costs, Totals);
        PrintReceipt(Costs, Totals);
        }
        while(AskAgain() > 0);
}

void clear(void)
{
        system("cls");
}        

int size_menu(void)
{
        int size;
        clear();
        printf("\t\t\t\tThe Menu\n\t\t\t\t--------\n\n");
        printf("Please choose a size:\n");
        printf("[1] Large\n");
        printf("[2] Medium\n");
        printf("[3] Small\n\n");
        printf("Your choice: ");
        scanf("%d", &size);
        return size;
}

int top_menu(void)
{
        int top;
        clear();
        printf("\t\t\t\tThe Menu\n\t\t\t\t--------\n\n");
        printf("Please choose a topping:\n");
        printf("[1] Cheese\n");
        printf("[2] Pepperoni\n");
        printf("[3] Sausage\n");
        printf("[4] Special\n\n");
        printf("Your choice (0 to stop): ");
        scanf("%d", &top);
        return top;
}

void Order(struct PizzaCosts *Costs, struct StuffBought *Totals)
{
        Totals->Size = size_menu();
        if (Totals->Size == 1)
                Totals->total += Costs->large;
        if (Totals->Size == 2)
                Totals->total += Costs->medium;
        if (Totals->Size == 3)
                Totals->total += Costs->small;

        do {
                    Totals->topping = top_menu();
                    if (Totals->topping == 1) {
                        Totals->total += Costs->Cheese;
                        Totals->NumOfCheese += 1;
                    }
                    if (Totals->topping == 2) {
                        Totals->total += Costs->Pepperoni;
                        Totals->NumOfPepperoni += 1;
                    }
                    if (Totals->topping == 3) {
                        Totals->total += Costs->Sausage;
                        Totals->NumOfSausage += 1;
                    }
                    if (Totals->topping == 4) {
                        Totals->total += Costs->Special;
                        Totals->NumOfSpecial += 1;
                   }
        }
        while(Totals->topping !=0);
}

void InitStructs(struct PizzaCosts *Costs, struct StuffBought *Totals) {
        Costs->large = 12.00;      // cost of items.
        Costs->medium = 10.00;
        Costs->small = 9.00;
        Costs->Cheese = 0.95;
        Costs->Pepperoni = 2.95;
        Costs->Sausage = 1.95;
        Costs->Special = 3.95;
        Totals->NumOfCheese=0;
        Totals->NumOfPepperoni=0;
        Totals->NumOfSausage=0;
        Totals->NumOfSpecial=0;
        Totals->topping=0;
        Totals->Size=0;
        Totals->total=0;
}

int PrintReceipt(struct PizzaCosts *Costs, struct StuffBought *t) {
        float total;
        total = t->total;
        clear();
        printf("\nYour Receipt:");
        printf("\n\nItem\t\tPrice\t\tQty\n----\t\t-----\t\t---\n\n");
        if (t->Size == 1)
                printf("Large Pizza\t%.2f\t\t1\n", Costs->large);
        if (t->Size == 2)
                printf("Medium Pizza\t%.2f\t\t1\n", Costs->medium);
        if (t->Size == 3)
                printf("Small Pizza\t%.2f\t\t1\n", Costs->small);
        if (t->NumOfCheese != 0)
                printf("Cheese\t\t%.2f\t\t%d\n", Costs->Cheese, t->NumOfCheese);
        if (t->NumOfPepperoni != 0)
                printf("Pepperoni\t%.2f\t\t%d\n", Costs->Pepperoni, t->NumOfPepperoni);
        if (t->NumOfSausage != 0)
                printf("Sausage\t\t%.2f\t\t%d\n", Costs->Sausage, t->NumOfSausage);
        if (t->NumOfSpecial != 0) 
                printf("Special\t\t%.2f\t\t%d\n", Costs->Special, t->NumOfSpecial);
        printf("\nTotal: %.2f\n\n", total);
        return 0;
}

int AskAgain(void) {
        char answer;
        while (1) {
        printf("\nWould You Like to Take Another Order? (Y/n) ");
        answer = getchar();
        if (answer == 'Y' || answer == 'y')
                return 1;
        if (answer == '\0' || answer == ' ' || answer == '\n')
                return 1;
        if (answer == 'n' || answer == 'N')
                return 0;
        }
}

pizza.h

//  Structures
struct PizzaCosts {                     // This Structure holds the current
        float large;      // cost of items.
        float medium;
        float small;
        float Cheese;
        float Pepperoni;
        float Sausage;
        float Special;
};

struct StuffBought {
        int NumOfCheese;            // This structure keeps track of
        int NumOfPepperoni;         // the number of items we bought
        int NumOfSausage;           // when it comes time to print the
        int NumOfSpecial;           // recipt...What's a Special Chris???
        int topping;
        int Size;
        float total;
};
//  End of Structues