MQL4 Reference 
Basics Operations & Expressions
Some characters and character sequences are of a special importance. These are so-called operation symbols, for example:
+ - * / % symbols of arithmetic operations
&& || symbols of logic operations
= += *= symbols of assignment operations
Operation symbols are used in expressions and have sense when appopriate operands are given them
Punctuation marks are emphasized, as well. These are parentheses, braces, comma, colon, and semicolon.
Operation symbols, punctuation marks, spaces are used to separate language elements from each other.
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