Python program examples to check if a number is positive, negative or 0

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Here are three Python program examples to check if a number is positive, negative or 0 using

  • Using if-elif-else statements:
  • Using a ternary operator:
  • Using a lambda function and map

Using if-elif-else statements

  • This program below takes user input as a number and uses if-elif-else statements to check if it’s positive, negative, or zero.
  • The corresponding message is then printed to the console.
num = float(input("Enter a number: "))
if num > 0:
    print("Positive number")
elif num == 0:
    print("Zero")
else:
    print("Negative number")

Output

Enter a number: 10
Positive number


Enter a number: -2.5
Negative number


Enter a number: 0
Zero

Using a ternary operator

  • This program takes user input as a number and uses a ternary operator to check if it’s positive, negative, or zero.
  • The corresponding message is then printed to the console.
num = float(input("Enter a number: "))
print("Positive number" if num > 0 else "Zero" if num == 0 else "Negative number")

Output

Enter a number: 5
Positive number

Using a lambda function and map:

  • This program takes user input as a number and uses a lambda function with a map to check if it’s positive, negative, or zero.
  • The result is then converted to a list and the first element is printed to the console.
num = float(input("Enter a number: "))
print(list(map(lambda x: "Negative number" if x < 0 else "Zero" if x == 0 else "Positive number", [num]))[0])

Output

Enter a number: 15
Positive number

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