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  types \code{"double"} and \code{"integer"} representing missing
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  types \code{"double"} and \code{"integer"} representing missing
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  values.  All other numeric constants start with a digit or period and
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  values.  All other numeric constants start with a digit or period and
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  are either a decimal or hexadecimal constant optionally followed by
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  are either a decimal or hexadecimal constant optionally followed by
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  \code{L}.
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  \code{L}.
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  Hexadecimal constants start with \code{0x} or \code{0X} followed by
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  Hexadecimal constants start with \samp{0x} or \samp{0X} followed by
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  a non-empty sequence from \code{0-9 a-f A-F .} which is interpreted as a
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  a non-empty sequence from \samp{0-9 a-f A-F .} which is interpreted as a
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  hexadecimal number, optionally followed by a binary exponent.  A binary
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  hexadecimal number, optionally followed by a binary exponent.  A binary
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  exponent consists of a \code{P} or \code{p} followed by an optional
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  exponent consists of a \code{P} or \code{p} followed by an optional
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  plus or minus sign followed by a non-empty sequence of (decimal)
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  plus or minus sign followed by a non-empty sequence of (decimal)
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  digits, and indicates multiplication by a power of two.  Thus
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  digits, and indicates multiplication by a power of two.  Thus
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  \code{0x123p456} is \eqn{291 \times 2^{456}}{291 * 2^456}.
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  \code{0x123p456} is \eqn{291 \times 2^{456}}{291 * 2^456}.