Use of start() ; init() and deinit() special functions in MT4 MACD sample?

 
Hello,

Why has MetaQuotes only used the start() function in MACD sample, whereas when I open a blank Expert Advisor ready to start programming in, it shows the start(), init() and deinit() functions. Why are the init() and deinit() functions missing from your MACD sample?

Thank you.

RJF
Reason: