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What is the main purpose of a header file in C programming?

easy📝 Conceptual Q11 of 15
C - Basics and Execution Environment
What is the main purpose of a header file in C programming?
ATo store declarations and share them between source files
BTo execute the main program logic
CTo compile the program faster
DTo store variable values during runtime
Step-by-Step Solution
Solution:

  1. Step 1: Understand what header files contain

    Header files usually contain declarations like function prototypes and macros, not executable code.

  2. Step 2: Understand their role in sharing code

    They allow multiple source files to share these declarations, so the compiler knows about functions and variables.

  3. Final Answer:

    To store declarations and share them between source files -> Option A

  4. Quick Check:

    Header files = declarations shared [OK]
Quick Trick: Header files hold declarations, not code [OK]
Common Mistakes:
  • Thinking header files contain executable code
  • Confusing header files with source files
  • Believing header files speed up compilation
  • Assuming header files store variable values

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