Unlike the constant, a variable is a programming code object that can modify its content. As the term suggests, a constant is something continuous, set once for all. ![]() The terms of constants and variables are introduced, the difference between these terms is explained. But don't forget to comment upon your code. What to do when a new tick incomes? What actions to take? This is control that moves to the forefront here. This is why tick is an important event that makes the basic mechanisms of MQL4 programs run. ![]() The main event when trading on financial markets is the change of price. Such terms as 'tick' (a price change), 'control' in algorithms, 'comment' in programs are described. This section represents basic terms underlying programming language MQL4:
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