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#include <math.h>float modff(float num, float *i);double modf(double num, double *i); long double modfl(long double num, long double *i);
modff( ) and modfl( ) were added by C99.
The modf( ) family of functions decomposes num into its integer and fractional parts. The functions return the fractional portion and place the integer part in the variable pointed to by i.
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