Mastering Python’s While Loop: Practice Exercises and Output Formatting

Python’s while loop is a fundamental control structure that allows for the repeated execution of a block of code as long as a certain condition remains true. Understanding and mastering its usage is crucial for developing efficient and readable Python programs. This article presents a series of exercises designed to help you practice and solidify your understanding of the while loop, along with guidelines on formatting the output according to a specified pattern.

Exercise 1: Basic Counter

‌Objective‌: Write a while loop that prints numbers from 1 to 10.
‌Solution‌:

pythonCopy Code
counter = 1
while counter <= 10:
    print(counter)
    counter += 1

‌Output Formatting‌: Ensure each number is printed on a new line.

Exercise 2: User Input Loop

‌Objective‌: Create a while loop that asks the user to enter a number. The loop should continue until the user enters “quit”.
‌Solution‌:

pythonCopy Code
prompt = "\nEnter a number (or 'quit' to exit): "
message = ""
while message.lower() != 'quit':
    message = input(prompt)
    if message.lower() != 'quit':
        print(f"You entered: {message}")

‌Output Formatting‌: Display the user’s input on the same line as “You entered: ” until “quit” is entered.

Exercise 3: Flag-Controlled Loop

‌Objective‌: Utilize a flag-controlled while loop to print numbers from 1 to 5.
‌Solution‌:

pythonCopy Code
counter = 1
flag = True
while flag:
    print(counter)
    counter += 1
    if counter > 5:
        flag = False

‌Output Formatting‌: Each number should be printed on a separate line.

Exercise 4: Infinite Loop and Break

‌Objective‌: Create an infinite while loop that prints “Hello, World!” indefinitely until a specific condition is met (e.g., a counter reaches 5).
‌Solution‌:

pythonCopy Code
counter = 0
while True:
    print("Hello, World!")
    counter += 1
    if counter == 5:
        break

‌Output Formatting‌: Each “Hello, World!” should be on a new line.

Conclusion

Practicing these exercises will not only help you master the while loop in Python but also reinforce good coding practices, such as proper output formatting. As you progress, try to experiment with different conditions and loop constructs to further deepen your understanding of Python’s control structures.

[tags]
Python, while loop, programming exercises, output formatting, control structures.