Question 1

What are the different levels of abstraction in programming?

Accepted Answer

| Level | Description |
|-------|-------------|
| Machine Code | Hexadecimal or binary values representing the lowest-level instructions executed by hardware. |
| Assembly Code | Low-level mnemonic instructions that map closely to machine code but are slightly more readable. |
| High-Level View | Source code written in high-level languages with variables, functions, and control structures that are portable and more human-readable. |

Question 2

What are the key characteristics of variables?

Accepted Answer

1. Identifier: A variable has a name used to reference it in code.
2. Store Value: Holds a value that can change during execution.
3. Data Type: Specifies the kind of value the variable can hold (e.g., int, float, object).
4. Scope: Describes where the variable is visible (global or local).
5. Lifetime: The duration the variable exists in memory (e.g., program lifetime for globals, function execution for locals).

Question 3

What rules must an identifier follow in C/C++ and Python?

Accepted Answer

- Must start with a letter (A–Z or a–z) or an underscore (_); cannot start with a digit.
- Can contain letters, digits, and underscores (e.g., my_variable, _var, variable1).
- Case-sensitive (e.g., Variable and variable are distinct).
- Cannot use reserved keywords from the language (e.g., if, else, while, for).

Question 4

What are the key differences in identifier naming and variable typing between C/C++ and Python?

Accepted Answer

| Feature | C/C++ | Python |
|---------|--------|--------|
| Identifier Naming | Must start with letter or underscore, followed by letters, digits, underscores. | Same, but Python's dynamic nature makes naming overall more flexible in use. |
| Variable Typing | Static typing: types are declared and fixed (e.g., int, float). | Dynamic typing: variables take the type of their current value and can change. |
| Integer Types | Fixed-size signed/unsigned integers (char, int, long, etc.). | Arbitrary precision integers (no fixed-size limit). |
| Boolean Type | bool type with values true/false. | bool class with values True/False. |
| Floating Point | float, double, long double with differing precision. | float is double-precision (equivalent to C/C++ double). |

-02 Basic Components in C-C-- and Python

Created by Jacqueline

What are the different levels of abstraction in programming?

What are the key characteristics of variables?

What rules must an identifier follow in C/C++ and Python?

What are the key differences in identifier naming and variable typing between C/C++ and Python?

Level	Description
Machine Code	Hexadecimal or binary values representing the lowest-level instructions executed by hardware.
Assembly Code	Low-level mnemonic instructions that map closely to machine code but are slightly more readable.
High-Level View	Source code written in high-level languages with variables, functions, and control structures that are portable and more human-readable.

Feature	C/C++	Python
Identifier Naming	Must start with letter or underscore, followed by letters, digits, underscores.	Same, but Python's dynamic nature makes naming overall more flexible in use.
Variable Typing	Static typing: types are declared and fixed (e.g., int, float).	Dynamic typing: variables take the type of their current value and can change.
Integer Types	Fixed-size signed/unsigned integers (char, int, long, etc.).	Arbitrary precision integers (no fixed-size limit).
Boolean Type	bool type with values true/false.	bool class with values True/False.
Floating Point	float, double, long double with differing precision.	float is double-precision (equivalent to C/C++ double).