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PreIncrement
++
x increases the value of x by 1, returning the new value of x.
PreIncrement has attribute HoldFirst.
++
x is equivalent to x
=
x
+1.
See the Mathematica book: Section 2.4.4.
See also: Increment, AddTo, Set.
Further Examples
This initializes the variable i to the value 7, increments it, checks its value, and clears it.
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