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#include <math.h>float fmaf(float a, float b, float c);double fma(double a, double b, double c); long double fmal(long double a, long double b, long double c);
fma( ), fmaf( ), and fmal( ) were defined by C99.
The fma( ) family of functions returns the value of a * b + c. Rounding takes place only once, after the entire operation has been completed.
Related functions are round( ), lround( ), and llround( ).
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