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     The modf function breaks down the floating-point value <x> into
     fractional and integer parts, each of which has the same sign as
     <x>. The signed fractional portion of <x> is returned. The integer
     portion is stored as a floating-point value at <intptr>.
 
     The modfl function uses an 80-bit long double form of arguments
     and return values. In all other respects, it is identical to the
     regular function.
 
     Return Value
 
     The modf and modfl functions return the signed fractional portion
     of <x>. There is no error return.
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