modff.c

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#include <math.h>
 
_Check_return_
float
__cdecl
modff(
    _In_ float x,
    _Out_ float *y)
{
    double _Di, _Df;
 
    _Df = modf((double)x,&_Di);
    *y = (float)_Di;
 
    return (float)_Df;
}