#include <stdio.h>
#include <ctype.h>
#include <conio.h>
#define a 1000
#define b 800
#define c 1000
#define d 600
#define e 2000
#define f 3000

int main()
{

    char choice, answer, cont_prog, confirm,n;
    float order, price, card, name;

do
{




    printf("Menu\n");
    printf("Products available for sale.\n");
    printf("1. iPhone 7 $1000\n");
    printf("2. iPhone 6 $800\n");
    printf("3. iPad Pro $1000\n");
    printf("4. Apple Watch $600\n");
    printf("5. Macbook Pro $2000\n");
    printf("6. iMac $3000\n");
    printf("7. Quit\n");
    printf("Enter choice: ");
    scanf(" %c", &choice);

    choice = toupper(choice);


    switch( choice )
    {
        case '1' : printf("How many would you like to buy? \n");
                   scanf("%f", &order);
                   printf("Please enter your name\n");
                   scanf("%f", &name);
                   printf("Please enter your credit card number\n");
                   scanf("%f", &card);
                   if(card < 1000000000000 || card > 10000000000000000)
    {
        printf("INVALID\n");

    }
    if(card < 100000000000000 && card > 9999999999999)
    {
        printf("INVALID\n");

    }
    price = order * a;
    printf("Name: %c\n",n);
    printf("Credit card number: %f\n");
    printf("You will have to pay %f\n", price);
    printf("Please confirm your order. Y/N\n");
    scanf(" %c", &confirm);
    confirm = toupper(confirm);
    if ( confirm == 'Y')
    {
    printf("Thank you for purchasing!\n");
    }
    else if ( confirm == 'N' )
    {
    printf("Your order has been cancelled.\n");
    }
    else
    {
    printf("Invalid input!\n");
    }

                   break;

        case '2' : printf("How many would you like to buy? \n");
                   scanf("%f", &order);
                   printf("Please enter your name\n");
                   scanf("%f", &name);
                   printf("Please enter your credit card number\n");
                   scanf("%f", &card);
                   if(card < 1000000000000 || card > 10000000000000000)
    {
        printf("INVALID\n");

    }
    if(card < 100000000000000 && card > 9999999999999)
    {
        printf("INVALID\n");

    }
    price = order * b;
    printf("Name: %c\n",n);
    printf("Credit card number: %f\n");
    printf("You will have to pay %f\n", price);
    printf("Please confirm your order. Y/N\n");
    scanf(" %c", &confirm);
    confirm = toupper(confirm);
    if ( confirm == 'Y')
    {
    printf("Thank you for purchasing!\n");
    }
    else if ( confirm == 'N' )
    {
    printf("Your order has been cancelled.\n");
    }
    else
    {
    printf("Invalid input!\n");
    }

                    break;

        case '3' : printf("How many would you like to buy? \n");
                   scanf("%f", &order);
                   printf("Please enter your name\n");
                   scanf("%f", &name);
                   printf("Please enter your credit card number\n");
                   scanf("%f", &card);
                   if(card < 1000000000000 || card > 10000000000000000)
    {
        printf("INVALID\n");

    }
    if(card < 100000000000000 && card > 9999999999999)
    {
        printf("INVALID\n");

    }
    price = order * c;
    printf("Name: %c\n",n);
    printf("Credit card number: %f\n");
    printf("You will have to pay %f\n", price);
    printf("Please confirm your order. Y/N\n");
    scanf(" %c", &confirm);
    confirm = toupper(confirm);
    if ( confirm == 'Y')
    {
    printf("Thank you for purchasing!\n");
    }
    else if ( confirm == 'N' )
    {
    printf("Your order has been cancelled.\n");
    }
    else
    {
    printf("Invalid input!\n");
    }
                     break;

        case '4' : printf("How many would you like to buy? \n");
                   scanf("%f", &order);
                   printf("Please enter your name\n");
                   scanf("%f", &name);
                   printf("Please enter your credit card number\n");
                   scanf("%f", &card);
                   if(card < 1000000000000 || card > 10000000000000000)
    {
        printf("INVALID\n");

    }
    if(card < 100000000000000 && card > 9999999999999)
    {
        printf("INVALID\n");

    }
    price = order * d;
    printf("Name: %c\n",n);
    printf("Credit card number: %f\n");
    printf("You will have to pay %f\n", price);
    printf("Please confirm your order. Y/N\n");
    scanf(" %c", &confirm);
    confirm = toupper(confirm);
    if ( confirm == 'Y')
    {
    printf("Thank you for purchasing!\n");
    }
    else if ( confirm == 'N' )
    {
    printf("Your order has been cancelled.\n");
    }
    else
    {
    printf("Invalid input!\n");
    }
                   break;

       case '5' : printf("How many would you like to buy? \n");
                   scanf("%f", &order);
                   printf("Please enter your name\n");
                   scanf("%f", &name);
                   printf("Please enter your credit card number\n");
                   scanf("%f", &card);
                   if(card < 1000000000000 || card > 10000000000000000)
    {
        printf("INVALID\n");

    }
    if(card < 100000000000000 && card > 9999999999999)
    {
        printf("INVALID\n");

    }
    price = order * e;
    printf("Name: %c\n",n);
    printf("Credit card number: %f\n");
    printf("You will have to pay %f\n", price);
    printf("Please confirm your order. Y/N\n");
    scanf(" %c", &confirm);
    confirm = toupper(confirm);
    if ( confirm == 'Y')
    {
    printf("Thank you for purchasing!\n");
    }
    else if ( confirm == 'N' )
    {
    printf("Your order has been cancelled.\n");
    }
    else
    {
    printf("Invalid input!\n");
    }
                   break;

       case '6' : printf("How many would you like to buy? \n");
                   scanf("%f", &order);
                   printf("Please enter your name\n");
                   scanf("%f", &name);
                   printf("Please enter your credit card number\n");
                   scanf("%f", &card);
                   if(card < 1000000000000 || card > 10000000000000000)
    {
        printf("INVALID\n");

    }
    if(card < 100000000000000 && card > 9999999999999)
    {
        printf("INVALID\n");

    }
    price = order * f;
    printf("Name: %c\n",n);
    printf("Credit card number: %f\n");
    printf("You will have to pay %f\n", price);
    printf("Please confirm your order. Y/N\n");
    scanf(" %c", &confirm);
    confirm = toupper(confirm);
    if ( confirm == 'Y')
    {
    printf("Thank you for purchasing!\n");
    }
    else if ( confirm == 'N' )
    {
    printf("Your order has been cancelled.\n");
    }
    else
    {
    printf("Invalid input!\n");
    }break;


     case '7' : printf("Bye!\n");
                break;

     default : printf("Invalid input!\n");
     }

    printf("Do you want to start again? (y/n): ");
    cont_prog = getchar();
} while (cont_prog == 'y' || cont_prog == 'Y');


}