In my previous article we looked at the main programs that are used by MQL5 programmers (and came to the conclusion that the MetaEditor IDE is well suited for beginner needs). In addition, we took a quick look at the concept of a function and created a simple script that prints a message in the system log. These messages can be viewed at the bottom of the terminal window in the Experts tab. Now we come to the point that this data must be stored somewhere. Today we will ...