Question

Stages of Life: Write an if-elif-else chain that determines a person's stage of life. Set a value for the variable age, and then: \- If the person is less than 2 years old, print a message that the person is a baby. \- If the person is at least 2 years old but less than 4 , print a message that the person is a toddler. \- If the person is at least 4 years old but less than 13 , print a message that the person is a kid. \- If the person is at least 13 years old but less than 20, print a message that the person is a teenager. \- If the person is at least 20 years old but less than 65 , print a message that the person is an adult. \- If the person is age 65 or older, print a message that the person is an elder.

Short answer

Use if-elif-else to check age and print corresponding stage message.

Step-by-step solution

Set the Variable

First, set a variable named `age`, which will hold the age of the person we want to determine the life stage for. For example, `age = 10`.

Begin the if-elif-else Chain

Start with an `if` condition to check if the `age` is less than 2. If this condition is true, print the message, 'The person is a baby.'

Add the First elif Condition

Use `elif` to check if the person's age is at least 2 but less than 4. If true, print 'The person is a toddler.' This condition is written as `elif age >= 2 and age < 4:`.

Add the Second elif Condition

Add another `elif` condition to check if the age is at least 4 but less than 13. If true, print 'The person is a kid.' This condition is `elif age >= 4 and age < 13:`.

Add the Third elif Condition

Continue with another `elif` statement for age at least 13 but less than 20. If this condition holds, print 'The person is a teenager.' The statement is `elif age >= 13 and age < 20:`.

Add the Fourth elif Condition

Include another `elif` condition for ages 20 to less than 65. If true, print 'The person is an adult.' This can be written as `elif age >= 20 and age < 65:`.

Add the else Condition

Finally, use `else` to cover all ages 65 and older. This is the last condition and catches any remaining ages not caught by prior conditions, printing 'The person is an elder.'

Key concepts

Conditional Statements

In Python programming, conditional statements are used to execute code based on certain conditions. The most common conditional statements are the `if`, `elif`, and `else` statements. Conditional statements help in making decisions, allowing a program to behave differently under varying circumstances.
- **`if` Statement**: Begins a conditional test. Executes the block of code if the condition is true. - **`elif` Statement**: Short for "else if", allows you to check multiple expressions for truthfulness and execute a block of code when the first true condition is found. - **`else` Statement**: Executes a block of code if none of the preceding conditions are true.
Conditional statements are essential in controlling the flow of a program. They let the program decide what actions to take based on inputs or other factors. This ability to make decisions is crucial for creating dynamic and interactive applications.

If-Elif-Else Chain

The `if-elif-else` chain is a multi-way decision-making structure that allows for checking multiple conditions. It is a more efficient form of multiple `if` statements, as these are checked one by one, ceasing further checks once a true condition is found. - The chain begins with an `if` statement. - `elif` statements follow, providing additional conditions.
- An optional `else` statement can be included at the end, acting as a catch-all for situations where none of the `if` or `elif` conditions are true.
In practice, this chain allows for clean, readable logic. Each condition is evaluated in order, and once a condition is satisfied, the corresponding block of code is executed, skipping the rest. This makes `if-elif-else` chains extremely powerful for implementing branching logic.

Age Classification

Age classification is a common programming challenge where the age of a person is used to determine their stage of life. This kind of classification typically involves checking a series of age ranges to assign categories like 'baby', 'toddler', 'kid', 'teenager', 'adult', or 'elder'.
To implement age classification: - Define the variable `age` to represent the individual's age. - Use a sequence of conditional checks to determine which age range the `age` falls into.
For example, - Ages less than 2 classify as 'baby'. - Ages from 2 to less than 4 classify as 'toddler'.
The classification structure makes it straightforward to expand or refine the categories as needed. This concept is widely applicable in programming scenarios such as data analysis, user personalization, and more.

Programming Logic

Programming logic is the fundamental concept that governs how a program solves tasks or problems using well-thought-out statements and commands. It's about the sequence and structure of commands for effective decision-making and task execution.
To build solid programming logic, consider the following steps: - Break down complex problems into smaller, manageable parts. - Use clear and well-organized structures like loops and conditional statements.
- Prioritize readability and consistency in code.
Effective programming logic ensures that a program runs correctly and efficiently. It helps in devising solutions that are not only correct but also optimized in terms of performance. Mastering programming logic is essential for any developer looking to produce high-quality, reliable software.