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Python Program to Check Number is Positive, Negative, or Zero

Are you curious about determining whether a number is positive, negative, or zero in Python? Being able to discern the sign of a number is a fundamental skill in programming. Whether you're working on mathematical calculations, data analysis, or simply need to classify numbers based on their sign, having a Python program to check if a number is positive or negative can be incredibly useful.

In this post, we will explore Python code that allows you to effortlessly identify whether a given number is positive, negative, or zero. By leveraging the power of conditional statements and comparison operators, we can create a program that provides quick and accurate results. 

Check Negative and Positive Number in Python Using if...elif...else

Code

# Check given number is positive, negative or 0

number = float(input("Enter a number: "))

if number > 0:
    print("The number is positive")
elif number < 0:
    print("The number is negative")
else:
    print("The number is zero")

Output

Enter a number: -4
The number is negative

Explanation

In this program, we prompt the user to enter a number using the input() function. The input is converted to a floating-point number using the float() function and stored in the variable number.

We then use if...elif...else statements to check the value of the number and print the corresponding message based on its sign.

  • If the number is greater than 0, we print "The number is positive".

  • If the number is less than 0, we print "The number is negative".

  • If the number is neither greater than 0 nor less than 0, it must be 0, so we print "The number is zero".

When you run this program, it will prompt you to enter a number. After you provide the input, it will check the value of the number and display the appropriate message indicating whether the number is negative, positive, or zero.

Python Course

Find If Number is Positive, Negative or Zero Using Nested if

Code

# Using nested if to check number is positive, negative or zero

number = float(input("Enter a number: "))

if number < 0:
    print("The number is negative")
else:
    if number > 0:
        print("The number is positive")
    else:
        print("The number is zero")

Output

Enter a number: 2
The number is positive

Explanation

In the above program, we ask the user to enter a number using the input() function. The input is converted to a floating-point number using the float() function and stored in the variable number.

We use nested if statements to check the value of the number.

  • If the number is less than 0, we print "The number is negative".

  • If the number is not less than 0, we move to the inner if statement.

  • If the number is greater than 0, we print "The number is positive".

If the number is neither less than 0 nor greater than 0, it must be 0, so we print "The number is zero".

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Python Program to Check Number is Positive, Negative, or Zero