Module 7.4- Understanding Programming Language Categories

Question 1

High-level Languages

Answer 1

• these are languages designed to be easy for humans to read and write
• they abstract away the complexities of hardware operations, allowing you to focus on solving problems rather than managing system details
• Easier to Learn- high-level languages are closer to natural language, which makes them easier to learn and use, especially for beginners
• Automatic Memory Management- these languages often handle memory management and other low-level details automatically

Question 2

Popular High-level Languages

Answer 2

• Python- known for its simple, readable syntax, and is widely used in web development, data science, and automation
• Java- used in enterprise environments, Android development, and large-scale applications
• JavaScript- a must for web development, JavaScript enables dynamic and interactive websites
• e.g. if you’re building a web app, you’ll likely use JavaScript on the frontend and Python or Java on the backend- both are high-level languages that let you focus on building features rather than worrying about how the machine operates behind the scenes

Question 3

Low-level Languages

Answer 3

• these are closer to machine code, meaning they give you more control over the hardware but are harder to read and write
• Direct Hardware Control- low-level languages allow direct manipulation of memory and hardware components, making them ideal for tasks like writing operating systems or embedded systems
• Less Abstraction- require the programmer to manage system resources like memory, making them more complex but also more powerful in specific use cases
• Assembly Language- used for direct hardware control and performance optimisation; very specific to the hardware architecture
• C- while often considered a high-level language, C can also be used for low-level tasks, such as writing operating systems or performance-critical applications
• e.g. if you’re developing software for a microcontroller or need to write a device driver, you might use Assembly or C to get the level of control required for optimal performance

Question 4

Compiled Languages

Answer 4

• Faster Execution- because the code is already translated into machine code, compiled languages tend to run faster than interpreted ones
• Error Checking Before Execution- the compiler will catch many errors before the program is even run, which can save time during the development process

Question 5

Examples of Compiled Languages

Answer 5

• C++- commonly used in game development, high-performance systems, and software requiring efficient memory management
• Java- while it’s often considered a mix of both compiled and interpreted, Java first compiles code into bytecode, which is then interpreted by the Java Virtual Machine (JVM)

Question 6

Interpreted Languages

Answer 6

• code is translated and executed line by line by an interpreter at runtime, rather than being compiled into machine code first
• More Flexible and Easier to Debug- since the code is executed line by line, you can easily test and debug parts of your program without recompiling the whole thing
• Platform-Independent- interpreted languages tend to be more portable since they don’t need to be compiled for a specific system architecture

Question 7

Examples of Interpreted Languages

Answer 7

• Python- known for its readability and is often used in rapid development environments due to its interpreted nature
• JavaScript- in web development, JavaScript is interpreted by the browser, allowing for dynamic, real-time interaction on websites
• e.g. when writing a Python script, you don’t need to compile the entire program beforehand- can run your code and fix any errors as they occur, which is particularly useful during development and testing

Question 8

Procedural vs Object-Oriented Programming (OOP) Languages

Answer 8

• these paradigms represent different ways to organise and structure your code

Question 9

Procedural Programming

Answer 9

• Linear Flow- program is executed step-by-step, making it easy to follow and understand
• Functions and Procedures- tasks are broken down into small, reusable functions, each handling a specific task

Question 10

Examples of Procedural Programming

Answer 10

• C- one of the most widely used procedural languages, especially in system-level programming
• Pascal- an older procedural language often used for teaching programming concepts
• e.g. if you’re writing a simple calculator, you might use procedural programming to create functions for each operation (add, subtract, multiply) and call them when needed

Question 11

Object-Oriented Programming (OOP)

Answer 11

• the focus is on objects-self-contained entities that represent real-world items or abstract concepts
• Objects and Classes- objects are instances of classes, which define the structure and behavior of those objects
• think of a class as a blueprint and an object as a specific instance of that blueprint
• Encapsulation- OOP promotes encapsulation, meaning data is hidden inside objects and only exposed through specific methods
• Reusability- OOP allows for code reuse through inheritance, where one class can inherit properties and methods from another

Question 12

Examples of OOP

Answer 12

• Java- known for its strong support for OOP concepts, it’s widely used in enterprise software and Android development
• Python- while Python supports multiple paradigms, it’s often used in OOP projects because of its flexibility
• e.g. in a game, you might define a Character class with properties like health and speed- then, you can create multiple character objects e.g. hero, villain that share those properties but have their own unique behaviours

Question 13

Scripting Languages

Answer 13

• commonly used for automating tasks, handling lightweight jobs, or extending the functionality of larger programs

Question 14

What are Scripting Languages used for?

Answer 14

• designed to automate repetitive tasks or control other applications
• usually interpreted, meaning they don’t need to be compiled, making them ideal for quick development and execution
• Automation- scripting languages are often used to automate tasks, such as running backups, processing files, or deploying code
• Glue Code- they are also used to “glue” together different software components, allowing programs to work together
• Bash- often used in Unix/Linux environments for automating system tasks
• JavaScript- go-to language for web browsers, adding interactivity to websites
• Perl- known for its text processing capabilities, Perl is often used for automating tasks in web development and network programming
• e.g. a system administrator might use a Bash script to automate server backups, ensuring that data is saved at regular intervals without manual intervention