[1편] C# 프로그래밍 언어 시작하기 | C# 프로그래밍 입문

Main ideas & concepts (lesson summary)

C# overview

• C# is a general-purpose, multi-paradigm programming language.
• It is tied to Microsoft’s .NET ecosystem and is used to build many kinds of software.

What the .NET Framework is

The .NET Framework is described as an open-source, cross-platform development/runtime environment used to execute code and support program execution.

It includes responsibilities such as:

• Running C# code
• Handling the pipeline for converting source code into machine code through intermediate stages

Key terms:

• General-purpose: usable for many different kinds of applications.
• Multi-paradigm (multi-style): supports multiple programming approaches, rather than only one style.

How compilation and language translation work

• A compiler acts as an intermediary, converting human-readable code into a form computers can execute.
• The key idea highlighted is an intermediate representation stage:
  • Code is translated into an intermediate form before becoming machine-understandable code.

Terminology: high-level vs. low-level vs. intermediate

• High-level code: examples mentioned include F# and Visual Basic (human-friendly languages).
• Low-level / machine code: the final form that machines execute (the executable machine-readable output).
• Intermediate stage: a level that is neither fully high-level nor fully low-level.

Cross-platform execution and environment differences

The subtitles contrast where .NET/C# is used:

• .NET Framework is associated with Windows environment usage (running programs and developing Windows-targeted services/apps).
• C# can be used across more environments, including:
  • Linux/Mac (for desktop/web scenarios)
  • Mobile environments such as iOS/Android

Takeaway: even with the “same C#,” the runtime/platform can differ depending on the target environment.

General-purpose vs. purpose-specific programming languages

• General-purpose languages (examples listed): C, C++, Python, Visual Studio, Code, and C#
  • Used across many domains such as web, mobile, and data analysis.
• Purpose-specific languages (examples listed): Fortran, Misuk
• Another purpose-specific example:
  • “Formula Translator (KOTRA)” is described as being used for transforming formulas and numerical calculations, including AI-related processing.
  • It’s also referenced alongside uses such as AutoCAD 3D graphics/document editors.

Multi-paradigm programming and imperative vs. declarative

Multi-paradigm languages support more than one programming style. Two broad categories described:

Imperative style

• Focuses on how to do things step-by-step.
• Explained as procedural/object-restricted in spirit.
• Restaurant analogy: seat guests by filling empty seats first, then they enter when seats are available.

Declarative style

• Focuses on what should be true, rather than the exact step sequence.
• Restaurant analogy: people ask for seats; the host “sets things up” based on the requirement.

Additional note:

• Even within imperative programming, procedural and object-oriented approaches differ (to be covered later).

How/when to use paradigms correctly

C# is characterized as supporting multiple programming features/styles, including:

• Commands and declarations
• Procedural programming
• Object-oriented programming
• Functional programming

Caution:

• If paradigms are not understood, developers may write object-oriented code in a procedural way.

Next step promised:

• A later session will cover differences between procedural and object-oriented programming languages.

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Methodologies / instructions (as presented)

• Understand programming paradigms before applying them
  • Learn distinctions between:
    • Imperative vs. declarative
    • Procedural vs. object-oriented (noted as coming later)
  • Then:
    • Use the appropriate programming style according to the task’s purpose.
  • Avoid:
    • Misapplying object-oriented concepts in a purely procedural manner.

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Speakers / sources featured (as named in subtitles)

• Makeup Ment (speaker)
• Microsoft (organization behind .NET, referenced as the developer of the .NET Framework)
• Java (referenced as a comparable concept: Java Virtual Machine)
• AutoCAD (referenced as an example of use)