Increment/Decrement Operators
++a or a++
equivalent to ‘a = a + 1’ or ‘a += 1’
--a or a--
equivalent to ‘a = a -1’ or ‘a -= 1’
Pre-increment (pre-decrement): Increment (decrement) variable, then use its value.
Post-increment (post-decrement): Use the variable’s value, then increment (decrement) it.