TITLE: Convert any number to positive. How?
QUESTION [9 upvotes]: How to convert any number (negative or positive) into a positive number.. For example, my input can be 4545 or -4545, I need the out  come to be positive value 4545.

REPLY [13 votes]: With a calculator, you could make a number positive in one of two (simple) ways:

$\text{abs}(x)$
$\sqrt{(x^2)}$

The first one is recommended, but the second one will work as well as the square root function on most calculators returns the positive root. Squaring a real number always makes it positive, so taking the square root of a number squared returns the positive number.