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     The ceil function returns a floating-point value representing the
     smallest integer that is greater than or equal to <x>.
 
     The floor function returns a floating-point value representing the
     largest integer that is less than or equal to <x>.
 
     The long double functions use an 80-bit long double form of
     arguments and return values. In all other respects, they are
     identical to the regular functions.
 
     Return Value
 
     The return value is described above. There is no error return.
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