C - Basics and Execution Environment
Why is it recommended to put only declarations (not definitions) in header files in C?
Why is it recommended to put only declarations (not definitions) in header files in C?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand difference between declaration and definition
Declarations tell the compiler about functions or variables; definitions provide the actual code or storage.Step 2: Reason about multiple inclusion
If definitions are in headers included multiple times, linker sees duplicates causing errors.Final Answer:
To avoid multiple definition errors during linking -> Option CQuick Check:
Definitions in headers cause multiple definitions = linker errors [OK]
Quick Trick: Headers declare; source files define to prevent duplicate code [OK]
Common Mistakes:
- Thinking definitions are forbidden in headers
- Believing declarations affect runtime speed
- Assuming headers speed up compilation
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