Keywords in C

c keywords

Note: All the keywords must be written in lower case.
Constants : Any unchanged value in a program during the program execution is called constant.
There mainly two types of Constants in C language.

  • Numeric Constants
  • String or Character Constant
    Numeric Constants :
    There are two types of numeric constants.
    (i) Integer Constant
    (ii) Real or floating point constant

    (i) Integer Constant : An integer constant is a signed or unsigned whole number.
    Example : -25, +25

    (ii) Real or floating point constant : Any signed or unsigned number with fractional part is called real or floating point constant. A real constant can be written in decimal or exponential form.
    Example :

  • Decimal form
    0.542
    +355.0
    -3.14

  • exponential form
    exponent