1.floor()      double floor ( double x );        float floor ( float x ); long double floor ( long double x );2.ceil()      double ceil ( double x );   float ceil ( float x ); long double ceil ( long double x ); 3.modf()      double modf ( double x, double * intpart );      long double modf ( long double x, long double * intpart );        float modf ( float x, float * intpart );

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