Python program to check if a number is positive or negative has been shown here. A number n is said to be positive if it is greater than 0 i.e. n > 0 and it is considered as negative if it is less than 0 i.e. n < 0. If n = 0 then it is neither positive nor negative.

The following sections cover the Python program to determine if a number is positive or negative by using the above logic.

## 1. Algorithm to check if a number is positive or negative

// $n$ is an input number//

1. If $n\gt0$, then Return Positive else

2. If $n=0$, then Return Neither positive nor negative else

3. Return Negative

## 2. Pseudocode to check if a number is positive or negative

Input: A number $n$

Output: If $n$ is positive or negaive

1. Procedure positiveOrNegative($n$):

2. If $n\gt0$:

3. Return positive

4. Else:

5. If $n==0$:

6. Return Neither positive nor negative

7. Else:

8. Return negative

9. End Procedure

## 3. Time complexity to check if a number is positive or negative

Time Complexity: O(1)

## 4. Python Program to check if a number is positive or negative

Code has been copied
# ***********************************************************
#                    alphabetacoder.com
# Python program to check if a number is positive or negative
# ***********************************************************/

# take input of number
n = int(input("Enter the number = "))

# check if n is postive or negative
if n > 0:
print(n, "is positive")
else:
if n == 0:
print(n, "is neither positive nor negative")
else:
print(n, "is negative")

Output

#### Case 1:

Enter the number = -5

-5 is negative

#### Case 2:

Enter the number = 7

7 is positive

#### Case 3:

Enter the number = 0

0 is neither positive nor negative