Revision 5ae4251c doc/eval.texi

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doc/eval.texi
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Evaluate expression @var{expr} while the expression @var{cond} is
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non-zero, and returns the value of the last @var{expr} evaluation, or
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NAN if @var{cond} was always false.
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@item ceil(expr)
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Round the value of expression @var{expr} upwards to the nearest
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integer. For example, "ceil(1.5)" is "2.0".
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@item floor(expr)
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Round the value of expression @var{expr} downwards to the nearest
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integer. For example, "floor(-1.5)" is "-2.0".
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@item trunc(expr)
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Round the value of expression @var{expr} towards zero to the nearest
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integer. For example, "trunc(-1.5)" is "-1.0".
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@end table
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Note that:

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