/* That is my entire main() */

int main(void)
{
    ShotoBomb();
    welcome();
    menu();    /* <-------- This calls to 4 other functions */
    bye();
    return 0;
}

/* and here is the rest of my program */

void ShotoBomb(void)
{
    printf("This program is a creation of ShotoBomb.\n");
    printf("       a.k.a. Kevin VanUs\n\n\n");
}

void welcome(void)     /* <------------- This is different for every program I write.  Sometimes it says a lot more. */
{
    printf("Welcome to Inventory Manager.");
}

void menu(void)
{
    choice = 5;
    printf ("\n--------------------------\n");
    printf ("0: Exit\n");
    printf ("1: Item Sold\n");
    printf ("2: Daily Report\n");
    printf ("3: Weekly Check\n");
    printf ("4: Monthly Update\n\n");
    printf ("Please enter the number of the menu item you desire: ");
    scanf ("%d", &choice);
    gets(a);
    switch (choice)
    {
        case 0:    break;
        case 1: puts("\n\n");
                itemsold();
                break;
        case 2: puts("\n\n");
                dailyreport();
                break;
        case 3: puts("\n\n");
                weeklycheck();
                break;
        case 4: puts("\n\n");
                monthlyupdate();
                break;
        default: puts("\nPlease enter a menu choice 0 - 4.\n\n");
                 menu();
                 break;
    }
}

void itemsold(void)
{
    item = &item01;
    printf("Item    ID#\n\n");
    for (loop = 0; loop < 20; loop++)
    {
        printf("%s    %d\n", item->name, item->ID);
        item = item + 1;
    }
    printf("\nEnter the ID number of the item sold: ");
    scanf("%d", &inputID);
    gets(a);
    printf("\n");
    while(inputID < 1 || inputID > 20)
    {
        printf("Please enter a correct ID number for the item sold: ");
        scanf("%d", &inputID);
        gets(a);
        printf("\n\n");
    }
    item = &item01;
    while (inputID != item->ID)
    {
        item = item + 1;
    }
    if(item->actual_stock < 1)
    {
        printf("%s is out of stock!", item->name);
    }
    else
    {
        printf("Number of %s(s) sold: ", item->name);
        scanf("%d", &sold);
        gets(a);
        while(sold < 0 || sold > item->actual_stock)
        {
            printf("\nPlease enter the number sold (between 0 and %d): ", item->actual_stock);
            scanf("%d", &sold);
            gets(a);
        }
        item->actual_stock = item->actual_stock - sold;
        item->total_month_sales = (item->total_month_sales) + sold;
        printf("%s, ID# %d SOLD(x%d) @ $%lg each.\n",item->name, item->ID, sold, item->price);
        due = item->price * sold;
        printf("Amount Due: $%lg\n\n", due);
    }
    inputID = 0;

    menu();
}

void dailyreport(void)
{
    item = &item01;
    printf("DAILY REPORT \nItem    ID    Monthly Sales\n");
    for (loop = 0; loop < 20; loop++)
    {
        printf("%s    %d    %d    \n", item->name, item->ID, item->total_month_sales);
        item = item + 1;
    }
    printf("\n");
    printf("Press 'ENTER' to return to menu.\n");
    fflush(stdout);
    (void)getchar();

    menu();
}

void weeklycheck(void)
{
    item = &item01;
    printf("Weekly Check\n--------------\n");
    printf("Restock the following items:\n");
    printf("Item    ID#    Amount to Buy\n\n");
    for(loop = 0; loop < 20; loop++)
    {
        item->restock = (item->wanted_stock)/10;
        amount_to_buy = (item->wanted_stock) - (item->actual_stock);
        if(item->actual_stock <= item->restock)
        {
            printf("%s    %d    %d\n", item->name, item->ID, amount_to_buy);
        }
        item = item + 1;
    }

    menu();
}

void monthlyupdate(void)
{
    item = &item01;
    printf("Monthly Update\n-------------\n\n");
    month = 0;
    while(month < 1 || month > 12)
    {
        printf("Enter the current month number(e.g. enter 1 for January): ");
        scanf("%d", &month);
        gets(a);
    }
    for(loop = 0; loop < 20; loop++)
    {
        item->curr_month = month;
        item = item + 1;
    }
    item = &item01;
    printf("Now please enter the actual in-stock inventory for each item.\n");
    printf("Item    ID#\n");
    for(loop = 0; loop < 20; loop++)
    {
        stock = 0;
        printf("\n%s    %d    Inventory (max %d): ", item->name, item->ID, item->wanted_stock);
        scanf("%d", &stock);
        gets(a);
        while(stock < 1 || stock > item->wanted_stock)
        {
            printf("Please enter the amount of inventory (between 1 and %d.): ", item->wanted_stock);
            scanf("%d", &stock);
            gets(a);
        }
        item->actual_stock = stock;
        item = item + 1;
    }
    item = &item01;
    for(loop = 0; loop < 20; loop++)
    {
        item->total_month_sales = 0;
        item = item + 1;
    }
    
    menu();
}

void bye(void)
{
    puts("\n\n\n\nThank you for using Inventory Manager by ShotoBomb.\n\n\n");
    puts("Normal Termination!\n");
    printf("Press 'ENTER' to quit.\n");
    fflush(stdout);
    (void)getchar();
}

int main() {
   runmyprogram();
   return 0;
}