Arithmetic operations include additive and multiplicative operations:
Increment and decrement operations are applied only to variables, they can't be applied to constants. The prefix increment (++i) and decrement (--k) are applied to the variable right before this variable is used in an expression.
Post-increment (i++) and post-decrement (k--) are applied to the variable right after this variable is used in an expression.
Computational problems may occur while moving the above expression from one programming environment to another one (for example, from Borland C++ to MQL4). In general, the order of computations depends on the compiler implementation. In practice, there are two ways to implement the post-decrement (post-increment):
Currently the first way of post-decrement (post-increment) calculation is implemented in MQL4. But even knowing this peculiarity, it is not recommended to experiment with its use.