Check if a Number is Positive or Negative in Python

Given an integer input, the objective is Check if a Number is Positive or Negative in Python. In order to do so we have the following methods,

1. Method 1: Using Brute Force
2. Method 2: Using Nested if-else Statements
3. Method 3: Using ternary operator

Method 1: Using Brute Force

This method uses Brute Force to check whether a given integer is Positive or Negative.

Python Code

num = 15
if num > 0:
    print('Positive')
elif num < 0:
    print('Negative')
else:
    print('Zero')

Output

Positive

Algorithm

This method uses Brute Force to check whether a given integer is Positive or Negative.

Algorithm for the above code is as follows,

• Initialize num as 15
• If the num > 0: it is a positive number.
• If the num < 0: it is a Negative number.
• Else the number has to be zero itself

Method 2: Using Nested if-else Statements

This method uses a nested if-else Statements to check whether a given number is Positive or Negative.

Python Code

num = 15
if num>=0:
    if num==0:
        print('Zero')
    else:
        print("Positive")
else:
    print("Negative")

Output

Positive

Algorithm

This method uses a nested if-else Statements to check whether a given number is Positive or Negative.

Algorithm for the above code is as follows,

• Initialize num as 15
• If the num >= 0
  • If num == 0 : num is zero
  • Else number has to be positive 
• Else the number has to be negative

Method 3: Using Ternary Operator

This method uses a ternary operator to check whether a number is Positive or Negative.

Ternary Operator Syntax( Condition ) ? ( if True : Action) : ( if False : Action) ;

Python Code

num =15
print("Positive" if num>=0 else "Negative")

Output

Positive

Algorithm

For a user input num

• Return “Positive” if num>=0 else “Negative”.

Algorithm for the above code is as follows,

• Initialize num as 15.
• print the output using ternary operator in python using print () function.