📊 C Programming
Q. What is the keyword used to prevent redefinition of a header file?
  • (A) #ifdef
  • (B) #ifndef
  • (C) #define
  • (D) #endif
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✅ Correct Answer: (B) #ifndef

Explanation: #ifndef is used in header guards to prevent multiple inclusion.

Explanation by: Mr. Dubey
#ifndef is used in header guards to prevent multiple inclusion.

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