Question

Write a loop that reads ten numbers and a second loop that displays them in the opposite order from which they were entered.

Short answer

Create two loops: one for input and one for reverse output.

Step-by-step solution

Initialize Variables

Begin by creating a list to store the numbers entered by the user. Also, set up a counter variable to ensure you read exactly ten numbers during input.

Read Numbers Using a Loop

Use a loop that iterates ten times to prompt the user for input. In each iteration, read a number and store it in the list initialized in Step 1.

Set Up Second Loop for Display

Create a second loop to iterate over the list of numbers in reverse order. Use a range or loop function to traverse from the last index to the first.

Display Numbers in Reverse Order

In each iteration of the second loop, print out the current number from the list. Since you are iterating in reverse, the numbers will be displayed in the opposite order from which they were entered.

Key concepts

List Manipulation

In Python, lists are mutable sequences, which makes them flexible for various operations, including manipulation. When solving the exercise of reading ten numbers and then displaying them in reverse order, the role of list manipulation becomes clear.

• **Initialization**: Begin with an empty list to collect numbers. In Python, this is often done using `my_list = []`.
• **Appending Elements**: During the input phase, numbers are added to the list. This is achieved using the `append()` method, such as `my_list.append(number)`. It energetically grows the list by one element at a time, appending at the end.
• **Reversing**: To access numbers in reverse, Python provides easy-to-use methods. One can simply use `reversed(my_list)` or slice the list using `my_list[::-1]`.

These tools make list manipulation in Python approachable, enabling tasks like reversing the sequence of stored numbers both effective and efficient.

User Input

Gathering user input is a fundamental aspect of interactive programming. In Python, user input can be collected using the `input()` function. This exercise required reading ten numerical inputs from the user. Here's how it can be smoothly implemented: - **Input Function**: Use `input()` to prompt the user to enter data. For example, `number = input("Enter a number: ")` reads a string. - **Data Conversion**: Since input returns a string, convert it to a numerical type using `int()` or `float()`, such as `number = int(input(...))`. - **Loop for Repeated Input**: Encapsulate the `input()` call inside a loop to solicit input multiple times (ten times in this exercise). By understanding the user input basics, you can collect data effectively for further processing and manipulation. Always ensure to properly handle different data types and manage input errors through appropriate conversions and checks.

Programming Logic

Structuring a program's logic effectively is critical for streamlined execution, especially when dealing with loops and conditions. Programming logic concerns how you direct the flow of data and operations, making sure each step achieves the desired outcome. - **Control Structures**: Loops, such as `for` or `while`, are integral for repeating tasks. In the given exercise, two loops were used: one for input and another for outputting in reverse. - **Conditional Execution**: Though this task doesn't prominently feature conditions, understanding `if` statements allows for more complex manipulations and decisions within loops when needed. - **Sequencing and Indexing**: Pay attention to the order of operations and indexing within lists. The `range()` function is versatile, helping iterate in both standard and reverse order. By mastering these programming logic components, you ensure your Python programs are not just functional but also clear and maintainable. Applying these basics accordingly enables completion of tasks like reversing input in a structured way.