インテル® Fortran コンパイラー 14.0 ユーザー・リファレンス・ガイド
Elemental Module Intrinsic Function (Generic): Returns the next representable value after X toward Y. This is equivalent to the IEEE nextafter function.
The result type and kind is the same as x. If x is equal to y, the result is x; no exception is signaled. If x is not equal to y, the result has the value of the next representable neighbor of x toward y. The neighbors of zero (of either sign) are both nonzero.
The following exceptions are signaled under certain cases: