engineering computer science MCQ #2135

engineering computer science MCQ #2135

1. Question 1

   Q1. What is the purpose of `#ifndef` directive?

   • A) To include a header file multiple times
   • B) To prevent multiple inclusions of a header file
   • C) To define a macro
   • D) To undefine a macro

   Answer: To prevent multiple inclusions of a header file

   Explanation: #ifndef directive checks if a symbol is not defined, used to prevent multiple inclusions of the same header file.