Python

>>> n = -42
>>> -n       # if you know n is negative
42
>>> abs(n)   # for any n
42
>>> abs(-5.05)
5.05

a = -abs(a)

num = float(input("Enter a number: "))
if num > 0:
   print("Positive number")
elif num == 0:
   print("Zero")
else:
   print("Negative number")

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