Podcast
Questions and Answers
Which of the following scenarios best illustrates the concept of a variable's mutability?
Which of the following scenarios best illustrates the concept of a variable's mutability?
- Defining a function that always returns the same value, regardless of the input.
- Assigning the value 10 to a variable `count`, then later updating it to 15 based on user input. (correct)
- Creating a constant named `PI` and assigning it the value 3.14159 to ensure it never changes.
- Declaring a variable `x` and assigning it the value 5, which remains unchanged throughout the program's execution.
Consider the variable name student_ID. Which statement accurately describes why this is a good identifier?
Consider the variable name student_ID. Which statement accurately describes why this is a good identifier?
- It clearly conveys the purpose of the variable and follows naming conventions. (correct)
- It avoids using underscores, which can be difficult to type.
- It uses a cryptic abbreviation, saving space and reducing typing effort.
- It is short and concise, making the code easier to read quickly.
Which of these variable names is considered a valid identifier?
Which of these variable names is considered a valid identifier?
- `my-Variable`
- `a$b`
- `_total` (correct)
- `1st_Place`
Given the following scenario, what is the value of variable z after running the below code?
x = 5
y = 10
z = x
x = y
y = z
Given the following scenario, what is the value of variable z after running the below code?
x = 5
y = 10
z = x
x = y
y = z
Why is it important to choose descriptive names for variables in a program?
Why is it important to choose descriptive names for variables in a program?
Flashcards
Variable
Variable
A symbol that holds data or numbers.
Value
Value
The specific data held by a variable.
Identifier
Identifier
The name given to a variable, following specific rules.
Variable Naming Rules
Variable Naming Rules
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Changing Variable Values
Changing Variable Values
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Study Notes
Variables
- Variables are containers that hold data, such as numbers or other types.
- Variables are like small blackboards where data can be written and changed.
- Variables always have a value associated with them.
Value
- The value is the data held by a variable.
- Values can be changed as needed.
Names (Identifiers)
- Variable names should be meaningful and related to the data they hold.
- Identifiers must start with a letter or underscore.
- Subsequent characters can be letters, digits, or underscores.
- Use a consistent naming style (e.g., camelCase, snake_case).
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