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Python: Check if a number is positive, negative or zero

Python Basic: Exercise-109 with Solution

Write a Python program to check if a number is positive, negative or zero.

Positive Numbers: Any number above zero is known as a positive number. Positive numbers are written without any sign or a '+' sign in front of them and they are counted up from zero, i.e. 1, + 2, 3, +4 etc.
Negative Numbers: Any number below zero is known as a negative number. Negative numbers are always written with a '−' sign in front of them and they are counted down from zero, i.e. -1, -2, -3, -4 etc.
Always look at the sign in front of a number to check if it is positive or negative. Zero, 0, is neither positive nor negative.

Pictorial Presentation:

Python: Check if a number is positive, negative or zero.

Sample Solution-1:

Python Code:

num = float(input("Input a number: "))
if num > 0:
   print("It is positive number")
elif num == 0:
   print("It is Zero")
else:
   print("It is a negative number")
   

Sample Output:

Input a number: 150                                                
It is positive number 

Flowchart:

Flowchart: Check if a number is positive, negative or zero.

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The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-2:

Python Code:

n = float(input('Input a number: '))
print('Number is Positive.' if n > 0 else 'It is Zero!' if n == 0 else 'Number is Negative.')
   

Sample Output:

Input a number:  0
It is Zero!

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-3:

Python Code:

n = float(input("Input a number: "))
if n >= 0:
  if n == 0:
      print("It is Zero!")
  else:
      print("Number is Positive number.")
else:
  print("Number is Negative number.")
   

Sample Output:

Input a number:  -150
Number is Negative number.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

 

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Python: Tips of the Day

Try-catch-else construct:

try:
  foo() 
except Exception: 
  print("Exception occured")
else:
  print("Exception didnt occur")
finally:
  print("Always gets here")