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─────Run-Time Library───────────────────────────────────────────────────────
 
     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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