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  \code{\link{sprintf}} and related functions.  In these cases, the
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  \code{\link{sprintf}} and related functions.  In these cases, the
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  translation must give a compatible format or an error will be
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  translation must give a compatible format or an error will be
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  generated when the message is displayed.
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  generated when the message is displayed.
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  The rules for compatibility differ between C and \R in several ways. C
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  The rules for compatibility differ between C and \R in several ways. C
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  supports several conversions not supported by \R, namely \code{c, u,
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  supports several conversions not supported by \R, namely \code{c},
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  p, n}.  It is allowed in C's \code{sprintf()} function to have more
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  \code{u}, \code{p}, \code{n}.  It is allowed in C's \code{sprintf()}
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  arguments than are needed by the format string, but in \R the counts
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  function to have more arguments than are needed by the format string,
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  must match exactly.  \R requires types of arguments to match, whereas
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  but in \R the counts must match exactly.  \R requires types of
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  C will do the display whether it makes sense or not.
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  arguments to match, whereas C will do the display whether it makes
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  sense or not.
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  These functions compromise on the testing as follows.  The additional
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  These functions compromise on the testing as follows.  The additional
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  formats allowed in C are accepted, and all differences in argument
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  formats allowed in C are accepted, and all differences in argument
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  type or count are reported.  As a consequence some reported
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  type or count are reported.  As a consequence some reported
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  differences are not errors.
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  differences are not errors.