Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skillsβperfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
Youβve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Interactive Audio Lesson
Listen to a student-teacher conversation explaining the topic in a relatable way.
Understanding Conditions and the Modulo Operator
Unlock Audio Lesson
Signup and Enroll to the course for listening the Audio Lesson
Today, we're going to learn how to check whether a number is even or odd using a simple Python program. First, let's understand what the modulo operator does. Can anyone tell me what the modulo operator is?
Isn't the modulo operator used to find the remainder of a division?
Exactly, Student_1! For example, when we divide 5 by 2, the remainder is 1. So, we can use `%` to check if a number is even or odd. If `num % 2` equals 0, the number is even. Otherwise, it's odd. Can someone provide an example of what that looks like in Python?
Could you use 4 as an example? If we do `4 % 2`, it equals 0, so it's even!
Great illustration, Student_2! Itβs a simple but powerful way to check conditions in programming.
Writing the Program
Unlock Audio Lesson
Signup and Enroll to the course for listening the Audio Lesson
Now, letβs write our program together. First, we need to get the user's input. What function do we use to take input in Python?
We can use the `input()` function!
That's correct, Student_3! Let's write the first line: `num = int(input('Enter a number: '))`. This will store the input as an integer in the variable `num`. What should we do next?
Now we need to add the `if` condition to check if this number is even or odd.
Right, Student_4! So we write: `if num % 2 == 0:` followed by the code to print 'Even'. In the `else` part, we'll print 'Odd'.
So the complete program prints whether the entered number is even or odd?
Exactly! Letβs summarize what we learned: We used input to capture a number, applied the modulo operator to check evenness, and created an `if-else` structure for decision-making.
Code Review and Testing
Unlock Audio Lesson
Signup and Enroll to the course for listening the Audio Lesson
Now that weβve written our program, letβs test it out! What types of numbers should we test?
We should try both even and odd numbers to see if the program works correctly!
Good thinking! If we test with 8, what do you expect the output to be?
The output should say 'Even'!
Correct! And if we input 7, what should happen?
It should say 'Odd'!
Nice job! Testing different inputs helps us ensure our program functions as expected. Remember, always test extensively!
Introduction & Overview
Read a summary of the section's main ideas. Choose from Basic, Medium, or Detailed.
Quick Overview
Standard
The section illustrates how to use the modulo operator to determine whether an input number is even or odd through a straightforward Python program, emphasizing the use of conditional statements for decision-making in programming.
Detailed
Detailed Summary
In this section, we explore an example of a simple program written in Python that checks whether a given number is even or odd. The program utilizes the modulo operator (%), which gives the remainder of a division. When a number is divided by 2, if the remainder is 0, the number is classified as even; otherwise, it's odd.
Key Concepts:
- Input Handling: The program begins by requesting input from the user.
- Conditional Statements: It uses an
if-elseconstruct to make decisions based on the remainder of the number when divided by 2. - Output Display: Finally, it provides output to the user indicating whether the given number is even or odd.
This practical example helps reinforce fundamental programming concepts such as variables, control structures, and input/output operations.
Audio Book
Dive deep into the subject with an immersive audiobook experience.
Input a Number
Unlock Audio Book
Signup and Enroll to the course for listening the Audio Book
num = int(input("Enter a number: "))
Detailed Explanation
In this chunk, we are asking the user to enter a number. The input() function captures the user's input as a string, and the int() function converts that string into an integer so that we can perform numerical operations on it.
Examples & Analogies
Think of this step as asking someone their age. When they tell you '15', you need to convert that spoken word into a number (15) to understand how old they actually are.
Checking Even or Odd
Unlock Audio Book
Signup and Enroll to the course for listening the Audio Book
if num % 2 == 0:
print("Even")
else:
print("Odd")
Detailed Explanation
This chunk contains a conditional statement that checks if the number is even or odd. The % operator calculates the remainder when num is divided by 2. If the remainder is 0, the number is even, and 'Even' is printed. If the remainder is not 0, the number is odd, and 'Odd' is printed instead.
Examples & Analogies
Imagine you have a group of friends, and you want to pair them up for a game. If you have an even number of friends, everyone gets a partner, which is like the number being 'Even'. But if one friend is left out, they don't have a partner, which represents the number being 'Odd'.
Definitions & Key Concepts
Learn essential terms and foundational ideas that form the basis of the topic.
Key Concepts
-
Input Handling: The program begins by requesting input from the user.
-
Conditional Statements: It uses an
if-elseconstruct to make decisions based on the remainder of the number when divided by 2. -
Output Display: Finally, it provides output to the user indicating whether the given number is even or odd.
-
This practical example helps reinforce fundamental programming concepts such as variables, control structures, and input/output operations.
Examples & Real-Life Applications
See how the concepts apply in real-world scenarios to understand their practical implications.
Examples
-
Using the program, if the input is 4, the output will be 'Even'.
-
If the input is 7, the output will be 'Odd'.
Memory Aids
Use mnemonics, acronyms, or visual cues to help remember key information more easily.
π΅ Rhymes Time
-
To find if a number's neat (even) or odd, divide by two with a nod!
π Fascinating Stories
-
Once there was a number named 'Seven'. It wanted to know if it was cool. So, it went to a wise old teacher named Python, who said, 'If you divide me by 2 and the remainder's not seen, youβre even like a queen!'
π§ Other Memory Gems
-
E.O. (Even - Odd) can help you remember: Even means 0 remainder, Odd means 1 remainder.
π― Super Acronyms
EOP (Even or Odd Program)
- E: for Even
- O: for Odd
- P: for Program helps us recall how to check.
Flash Cards
Review key concepts with flashcards.
Glossary of Terms
Review the Definitions for terms.
-
Term: Even Number
Definition:
An integer that is divisible by 2 with no remainder.
-
Term: Odd Number
Definition:
An integer that is not divisible by 2 without a remainder.
-
Term: Modulo Operator
Definition:
A mathematical operator that returns the remainder of a division operation.
-
Term: Conditional Statement
Definition:
A programming construct that allows execution of certain code based on whether a condition evaluates to true or false.
-
Term: Input
Definition:
Data that is received by a program from the user.
-
Term: Output
Definition:
The data that is sent from a program to the user.
while True
num = int(input('Enter a number (0 to stop): '))
if num == -1
break
if num % 2 == 0 print('Even')
else: print('Odd')
- Hint: Think about how to implement a stopping condition.
- Problem: Modify the program to count how many even and how many odd numbers have been inputted by the user.
- Solution: // Pseudocode Example:
// even_count = 0
// odd_count = 0
// while True:
// num = int(input('Enter a number (or -1 to exit): '))
// if num == -1:
// break
// if num % 2 == 0:
// even_count += 1
// else:
// odd_count += 1
// print('Even count:', even_count, 'Odd count:', odd_count) - Hint: Consider how to maintain and update counters for even and odd inputs.