From 6e0d4cce8e7fd9d94206a861827d0c6d9a018081 Mon Sep 17 00:00:00 2001
From: Christopher Fremond <34804391+Frenchris@users.noreply.github.com>
Date: Fri, 13 Mar 2020 03:42:48 +0000
Subject: [PATCH] Update reachablenumberprog.en.md

---
 subjects/reachablenumberprog.en.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/subjects/reachablenumberprog.en.md b/subjects/reachablenumberprog.en.md
index 5de6f30c4..8dd4ea9cc 100644
--- a/subjects/reachablenumberprog.en.md
+++ b/subjects/reachablenumberprog.en.md
@@ -1,5 +1,16 @@
 ## reachable_number
 
+## **WARNING! VERY IMPORTANT!**
+
+For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:
+
+This means that:
+
+- The package needs to be named `package main`.
+- The submitted code needs one declared function main(```func main()```) even if empty.
+- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
+- Every other rules are obviously the same than for a `program`.
+
 ### Instructions
 
 Let us define a function f(x) by the following: first we add 1 to x, and then while the last digit of the number equals 0, we shall be deleting 0. Let us call 'y' reachable if we can apply **f** to **x** (zero or more times), and get **y**. 102 is reachable from 10098: f(f(f(10098))) = f(f(10099)) = f(101) = f(102). Any number is reachable from itself. You are given a positive number **n**, count how many integers are reachable from **n**.