I can not understand what is the problem of this code on Arduino?

Question

Arduino

I am attaching the error code.
Arduino: 1.6.13 Hourly Build 2016/11/03 09:33 (Windows 7), Board: "Arduino/Genuino Uno"
C:\Users\Александр\Desktop\sketch_nov04a\sketch_nov04a.ino: In function' void loop()': sketch_nov04a
:67: error: 'listenToSecretKnock' was not declared in this scope :133: error: 'validateKnock' was not declared in this scope sketch_nov04a:135: error: 'triggerOutput' was not declared in this scope sketch_nov04a:154: error: 'validateKnock' was not declared in this scope exit status 1 'listenToSecretKnock'
This report will have more information with File -> Preferences -> "Show verbose output during compilation"
option enabled . Code taken from this site. cxem.net/arduino/arduino148.php

Answer 1

the compiler cannot find the functions because they are accessed before they appear in the code. Usually carry up according to subordination or use a header file.

Answer 2

Strange, but this code compiled without errors for me

Answer 3

Try the stable version of the Arduino IDE. Place the folder with sketches somewhere without Cyrillic on the way.
In 1.6.11 it compiles without errors.

Answer 4

In 1,6,5 without errors, you can try to write function prototypes before setup():
void listenToSecretKnock(void);
void triggerOutput(void);
boolean validateKnock(void);
Should help.