The increment operator is indicated by ++ and is used to
increment the variable by 1.
eg. ++marks;
increments the value of the variable marks by 1.
It can be used in two ways : as a prefix, (++var), meaning that
the operator precedes the variable; and as a postfix, (var++), where the operator follows the variable.
In prefix the variable gets incremented first where as in postfix
the variable gets incremented after the operation of function of its associate operator.
Decrement Operators are similar to Increment Operators except
the fact for the operation of decrementation by 1. It can also be
used both as prefix and postfix forms of its format.
eg. --marks;
is used to decrement the value of marks by 1.
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