TYPE()

    TYPE() evaluates an expression and returns a single upper case
    character that indicates whether the expression is character, numeric,
    logical, memo, or undefined.  It is a test for the existence of a
    variable and/or the validity of an expression.

Syntax

    TYPE(<exp C>)

Usage

    The TYPE() function always returns an upper case letter.

    The possible TYPE() values are:

    Character           = C
    Numeric             = N
    Logical             = L
    Memo                = M
    Array               = A
    Undefined           = U
    Error syntactical   = UE
    Error indeterminate = UI

Usage

    TYPE() returns the type of the specified expression.  With its expanded
    capabilities, it can be used to test expression validity.  There arem
    however, several special cases to note:

    Array references: References to DECLAREd arrays return an "A".
    References to array elements return the type of the element.  Invalid
    references return "U".

    IF()/IIF(): In order to return the appropriate data type for an IF(),
    TYPE() evaluates the condition and then returns the type of the
    evaluated path.  If either the IF() condition or the evaluated path are
    invalid, TYPE() returns "UE".

    User-defined and EXTEND.LIB functions: If a reference is made anywhere
    in an expression to a function not found in CLIPPER.LIB (such as a
    user-defined or EXTEND.LIB function), TYPE() returns a "UI".