Python Program to check if a Number Is Positive Or Negative

Check if a Number is Positive or Negative in python

Given an integer input, the objective is to check whether the given integer is Positive or Negative. In order to do so we have the following methods:

Method 1: Using Brute Force

Method 2: Using Nested if-else Statements

Method 3: Using the ternary operato

Algorithm 1

For a user input num

If the num > 0: it is a positive number.

If the num < 0: it is a positive number.

Else the number has to be zero itself

Same logic we have followed in the below Python program.

• Method 1: Using Brute Force

                          num = int(input("Enter a number: "))
  
                          if num > 0:
                              print("The number is Positive")
                          elif num < 0:
                              print("The number is Negative")
                          else:
                              print("The number is Zero")
                          
                          
                      

  Output:

  Enter a number: -7
  The number is Negative
                      

• Method 2: Using Nested if-else Statements

Algorithm 2

1. Take input from the user.

2. If the number is greater than zero, print "Positive".

3. Else, check if the number is less than zero.

4. If true, print "Negative".

5. Otherwise, print "Zero".

                    num = int(input("Enter a number: "))

if num >= 0:
    if num == 0:
        print("The number is Zero")
    else:
        print("The number is Positive")
else:
    print("The number is Negative")

                    
                

Output:

                    Enter a number: 0
                    The number is Zero
                    
                

• Method 3: Using the ternary operator

Algorithm 3

1. Take input from the user.

2. Use the ternary operator to check if the number is positive, negative, or zero.

3. Print the result accordingly.

                    num = int(input("Enter a number: "))
                    print("The number is Positive" if num > 0 else "The number is Negative" if num < 0 else "The number is Zero")
                    
                    
                

Output:

                    Enter a number: 9
                    The number is Positive