Challenge Level: Growing experience
This programming challenge is linked to the following lessons:
Students will be able to:
Write a program that asks the user to enter a 13 digit product code, all in one line of input. Then adds up all the digits, every second one multiplied by 3 (2nd, 4th, and so on) and show if this total is a multiple of 10 (valid product code). For this challenge make sure the user can only enter a 13 digit product code.
Your program should display the outputs shown in this table for the given inputs provided:
| Input | Output |
|---|---|
| 9418870000852 | Valid product code! |
| 9415277000126 | Valid product code! |
| 9300728854542 | Invalid product code! |
| 9328350003719 | Valid product code! |
| 9415377000126 | Invalid product code! |
| 9418770000852 | Invalid product code! |
Click on the green flag, enter the inputs provided in the “testing examples” to see the expected output of your program.
when green flag clicked
ask [Enter a 13-digit product code:] and waitsay [Please enter a 13 digit number!]
say [Invalid product code!]
say [Valid product code!]repeat (6)
end
if <((total) mod (10)) = [0]> then
else
end
if <(length of (product code)) = [13]> then
else
endset [index v] to [1]
set [product code v] to []
set [total 1 v] to [0]
set [total 2 v] to [0]
set [total v] to [0]
set [total 1 v] to ((total 1) + (letter (index) of (product code)))
set [total v] to ((total 1) + ((total 2) * (3)))
set [total 1 v] to ((total 1) + (letter (index) of (product code)))
change [index v] by (1)
set [total 2 v] to ((total 2) + (letter (index) of (product code)))
change [index v] by (1)
change [product code v] by (answer)You can find the number digits in a number by using the
length of () block unders “Operators”.
For example: length of (2938339392383) //13
You can access a letter (or a digit) at a specified position in a string
(or number) by using the letter () of [] block under “Operators”.
For example: letter (4) of [18392819202910] //9
In this challenge you need to access all the digits of the product code number entered, adding the 1st, 3rd, 5th and so on digits and storing the result in variable "total 1" and adding the 2nd, 4th, 6th and so on digits and storing the result in variable "total 2". The output displays if the sum of "total 2" multiplied by 3 and "total 1" is a multiple of 10 or not.
