Python: Check if a number is positive, negative or zero
Python Basic: Exercise-109 with Solution
Write a Python program to check if a number is positive, negative or zero.
Positive Numbers: Any number above zero is known as a positive number. Positive numbers are written without any sign or a '+' sign in front of them and they are counted up from zero, i.e. 1, + 2, 3, +4 etc.
Negative Numbers: Any number below zero is known as a negative number. Negative numbers are always written with a '−' sign in front of them and they are counted down from zero, i.e. -1, -2, -3, -4 etc.
Always look at the sign in front of a number to check if it is positive or negative.
Zero, 0, is neither positive nor negative.
Pictorial Presentation:
Sample Solution-1:
Python Code:
num = float(input("Input a number: "))
if num > 0:
print("It is positive number")
elif num == 0:
print("It is Zero")
else:
print("It is a negative number")
Sample Output:
Input a number: 150 It is positive number
Flowchart:
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Sample Solution-2:
Python Code:
n = float(input('Input a number: '))
print('Number is Positive.' if n > 0 else 'It is Zero!' if n == 0 else 'Number is Negative.')
Sample Output:
Input a number: 0 It is Zero!
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Sample Solution-3:
Python Code:
n = float(input("Input a number: "))
if n >= 0:
if n == 0:
print("It is Zero!")
else:
print("Number is Positive number.")
else:
print("Number is Negative number.")
Sample Output:
Input a number: -150 Number is Negative number.
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Python Code Editor:
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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