Fundamentals of C Programming / C Language



A Brief History of C LanguageFUNDAMENTALS OF C LANGUAGE

KEYWORDS OR RESERVED WORDS:

  • Words that are used for Special purpose by the language.
  • These are always written in lowercase.
  • These have predefined uses and can’t be used for any other purpose in C Language.
  • C has 32 Keywords
  • (e.g.) Main (Indicate Main( ) function, we can’t use main for any other purpose).

CONSTANTS:

Constants are quantities whose values do not change during program execution.

Types of Constants:

Two types of constant are

  • Numeric Constant
  • Integer Constant (0, 245, -4759, +4595)
  • Floating-point Constant (25.5, 0.49, 245.463)
  • Character Constant (M, s, 5, +, – , * )

VARIABLES:

  • Value of Variable may change during program execution.
  • Variable represents memory location.
  • Data stored into the memory location.
  • May be Numeric or a non-numeric value.

Rules for Writing Variable Names:

  • Must be starting with Alphabetic Character or an underscore ( _ ).
  • First character cannot be a digit.
  • Spaces are not allowed in variable name
  • Special character are not allowed (#,^,&,* , %, }, etc)
  • Reserved words cannot be used.
  • Maximum length is up to 31 characters.
  • Two variables can not contain same name.

Types of Variables:

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