Computer Science SLO Based Key Point Notes

👉👉👉 Computer Science 12th Class Notes (Main Page)

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Unit 3: Object-Oriented Programming in C++


3.1.2 Header File and Reserved Words

Header File

Header files are the collection of the standard library functions to perform different tasks.

Reserved Words

  • In the C++ language, a reserved word is a word that has a predefined meaning and purpose which is defined by the developer of C++ language.
  • They are also known as keywords.
  • It cannot be changed or redefined by the user.
  • Keywords can only be used for the purpose for which it is defined.

List of keywords



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👉👉👉 Computer Science 12th Class Notes (Main Page)

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(National Book Foundation - As Federal Textbook Board, Islamabad 
Based on National Curriculum Pakistan 2026-2027 and Onward prescribed by Federal Board of Intermediate and Secondary Education, Islamabad, and All Pakistan Boards) 

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