Preprocessor Directives in C | CS3251 Programming in C Unit 1 | Anna University Tamil Tutorial

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In this video, we explain Preprocessor Directives in C, a frequently asked theory question in Unit 1 of CS3251 – Programming in C, under the Anna University Regulation 2021 syllabus.

Preprocessor directives help modify the source code before compilation begins. They are powerful tools in C programming that control what parts of code should be included, defined, or skipped. Explained in simple Tamil, this topic is vital for both lab viva and university exams.

📘 Topics Covered:

What is a preprocessor?

Role of #include, #define, #ifdef, #ifndef, #undef, #pragma

Header files and macros

Conditional compilation

Differences between compiler and preprocessor

How preprocessor works in C program flow

Common MCQs and previous year questions

🎯 Best For:

B.E/B.Tech CSE & IT students under Anna University

Regulation 2021 students

Lab viva and theory exam preparation

Tamil medium learners

📺 Subscribe for full CS3251 Programming in C video tutorials in Tamil, topic-by-topic and exam-focused.

#PreprocessorInC #CS3251 #AnnaUniversityTamil #ProgrammingInC #TamilCProgramming #CPreprocessorDirectives #Unit1CProgramming #CSESubjectsTamil #Regulation2021
  1. CSE IT Exam Preparation
  2. preprocessor directives in c
  3. #include in c
  4. #define in c
  5. macros in c
  6. conditional compilation in c
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