Return the smallest integral value that is not less than the specified x.
Description
Special value handling: * if x is quiet NaN, quiet NaN is returned. * If x is signaling NaN, quiet NaN is returned and the value of the macro EDOM is stored into errno. * if x is +/‐infinity or +/‐0, it is returned unmodified.
Examples: ceil(0.5) ==> 1.0; ceil(‐0.5) ==> 0.0
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