インテル® Fortran コンパイラー XE 13.1 ユーザー・リファレンス・ガイド
Inquiry Intrinsic Function (Generic): Returns the number of significant digits for numbers of the same type and kind parameters as the argument.
The result is a scalar of type default integer.
The result has the value q if x is of type integer; it has the value p if x is of type real. Integer parameter q is defined in Model for Integer Data; real parameter p is defined in Model for Real Data.