#include <stdio.h>

int main()
{
    char cmd;
    int num,num2;
    int i,j;
    int k[12];
    int OrderList[12]={ 0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0};

    char ItemList[12][15]={ "Extra Value 1" ,
                            "Extra Value 2" ,
                            "Extra Value 3" ,
                            "Big Mac"       ,
                            "Cheesse Burger",
                            "Filet Fish"    ,
                            "French Fries"  ,
                            "Apple Pie"     ,
                            "Salad"         ,
                            "Coke"          ,
                            "Ice Tea"       ,
                            "Milk Shakes"   };
    int ItemPrice[12]={ 109,
                        129,
                        159,
                        69,
                        35,
                        59,
                        30,
                        35,
                        50,
                        20,
                        20,
                        59};
    int Total=0;

    /****************Level1 - Command**********************/
    Command:
    for(i=0,Total=0;i<12;i++)
        Total+=ItemPrice[i]*OrderList[i];

    printf( "McDonald Bull Shit System\n"
            "1) Order       \n"
            "2) Cancel      \n"
            "3) Check       \n"
            "\n Payment: $%d \n" ,Total);

    cmd = getchar();
    system("cls");
    switch(cmd)
    {
        case '1': goto Command_Order;
        case '2': goto Command_Cancel;
        case '3': goto Command_Check;
    }
    goto Command;

    /************************************************************/

    /****************Level2 - Command: Order**********************/
    Command_Order:
    printf( "Order: \n"
            "1) Extra Value Meals   \n"
            "2) Burgers             \n"
            "3) Snacks & Sides      \n"
            "4) Drinks              \n"
            "5) Back                \n");

    cmd = getchar();
    system("cls");

    switch(cmd)
    {
        case '1': goto Order_ExtraValue;
        case '2': goto Order_Burgers;
        case '3': goto Order_SnacksAndSides;
        case '4': goto Order_Drinks;
        case '5': goto Command;
    }

    goto Command_Order;
    /************************************************************/

    /****************Level2 - Command: Cancel**********************/
    Command_Cancel:

    j=0;
    for(i=0;i<12;i++)
    {
        if(OrderList[i]>0)
        {
            printf("%d) %-15s \t: %d Serving(s)\n" ,j+1,ItemList[i],OrderList[i]);
            k[j]=i;
            j++;
        }
    }


    if(j==0)
    {
        printf("Nothing to Cancel\n\n......keyin any number to continue\n");
        while(getchar() == '\n')
            ;
        system("cls");
        goto Command;
    }

    else
    {
        printf("%d) Back\n\n", j+1);

        scanf("%d", &num);
        if( (num-1) ==j)
        {
            system("cls");
            goto Command;
        }


        else if(num<j+1)
        {
            if(OrderList[ k[num-1] ]>0)
            {
                printf("\nCancel Number: ");
                scanf("%d", &num2);

                if(OrderList[ k[num-1] ] >= num2)
                    OrderList[ k[num-1] ] -= num2;
                else
                {
                    printf("illegal operation\n\n......keyin any number to continued");
                    while(getchar() == '\n')
                        ;
                }
            }
        }
        else
        {
            printf("illegal operation\n\n......keyin any number to continued");
            while(getchar() == '\n')
                ;
        }
    }

    system("cls");
    goto Command;
    /************************************************************/

    /****************Level2 - Command: Check**********************/
    Command_Check:

    j=1;
    for(i=0;i<12;i++)
    {
        if(OrderList[i]>0)
        {
            printf("%d) %-15s : $%d x %d \t = $%d\n" ,j ,ItemList[i] , ItemPrice[i], OrderList[i], ItemPrice[i]*OrderList[i]);
            j++;
        }
    }

    printf("\nThe Bill is $%d, please Check" ,Total);

    return 0;
    /************************************************************/

    /****************Level3 - Order: ExtraValue**********************/
    Order_ExtraValue:

    printf( "Order:\n"
            "1) Extra Value 1: $109\n"
            "2) Extra Value 2: $129\n"
            "3) Extra Value 3: $159\n"
            "4) Back \n");

    cmd = getchar();
    if(cmd=='4')
        goto Command_Order;
    else
    {
        if(cmd=='1' || cmd=='2' || cmd=='3')
        {
            printf("Order Number: ");
            scanf("%d", &num);
        }

        switch(cmd)
        {
            case '1': OrderList[0]+=num;break;
            case '2': OrderList[1]+=num;break;
            case '3': OrderList[2]+=num;break;
            default : system("cls");goto Order_ExtraValue;
        }
    }
    system("cls");
    goto Command;
    /************************************************************/

    /****************Level3 - Order: Burgers**********************/
    Order_Burgers:
    printf( "Order:\n"
            "1) Big Mac \t\t:$69\n"
            "2) Cheese Burger \t:$35\n"
            "3) Filet Fish \t\t:$59\n"
            "4) Back \n");

    cmd = getchar();

    if(cmd=='4')
        goto Command_Order;
    else
    {
        if(cmd=='1' || cmd=='2' || cmd=='3')
        {
            printf("Order Number: ");
            scanf("%d", &num);
        }

        switch(cmd)
        {
            case '1': OrderList[3]+=num;break;
            case '2': OrderList[4]+=num;break;
            case '3': OrderList[5]+=num;break;
            default : system("cls");goto Order_Burgers;
        }
    }

    system("cls");
    goto Command;
    /************************************************************/

    /****************Level3 - Order: Snacks And Sides**********************/
    Order_SnacksAndSides:
    printf( "Order:\n"
            "1) French Fries \t:$30\n"
            "2) Apple Pies \t\t:$35\n"
            "3) Salad \t\t:$50\n"
            "4) Back \n");

    cmd = getchar();

    if(cmd=='4')
        goto Command_Order;
    else
    {
        if(cmd=='1' || cmd=='2' || cmd=='3')
        {
            printf("Order Number: ");
            scanf("%d", &num);
        }

        switch(cmd)
        {
            case '1': OrderList[6]+=num;break;
            case '2': OrderList[7]+=num;break;
            case '3': OrderList[8]+=num;break;
            default : system("cls");goto Order_SnacksAndSides;
        }
    }
    system("cls");
    goto Command;
    /************************************************************/

    /****************Level3 - Order: Drinks**********************/
    Order_Drinks:
    printf( "Order:\n"
            "1) Coke \t:$20\n"
            "2) Ice Tea \t:$20\n"
            "3) Milk Shake \t:$59\n"
            "4) Back \n");

    cmd = getchar();

    if(cmd=='4')
        goto Command_Order;
    else
    {
        if(cmd=='1' || cmd=='2' || cmd=='3')
        {
            printf("Order Number: ");
            scanf("%d", &num);
        }

        switch(cmd)
        {
            case '1': OrderList[9]+=num;break;
            case '2': OrderList[10]+=num;break;
            case '3': OrderList[11]+=num;break;
            default : system("cls");goto Order_Drinks;
        }
    }
    system("cls");
    goto Command;
    /************************************************************/

}