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Engineering LibreTexts

7.4: Void Data Type

  • Page ID
    10278
  • General Discussion

    The void data type has no values and no operations. It's a data type that represents the lack of a data type.

    C++ Reserved Word void
    Represent Nothing
    Size N/A or None
    Normal Signage N/A
    Domain (Values Allowed) None

    This data type was added in the transition from "C" to "C++". In "C" by default a function returned an integer data type. Some functions don't return a value of any kind. Thus, the need to have a data type that indicates nothing is being returned. The void data type is mainly used in the definition and prototyping of functions to indicate that either nothing is being passed in and/or nothing is being passed out.

    Definitions

    Void Data Type
    A data type that has no values or operators and is used to represent nothing.