How to get the negative value of a number?

If you need a negative number, just add - before it. For example (untested, but 95% sure it will work):

var number = 10
print (number) # prints 10
print (-number) # should print -10
print (number * -1) # should print -10

-my_number is the reverse of your number. Would also turn a negative number positive.

@Kequc said: -my_number is the reverse of your number. Would also turn a negative number positive.

True! If you want to ensure the number will be negative and not turned positive, you want to add a condition first:

if (number > 0):
	number = -number # make it negative!