fminl
(3)determine minimum of two floating-point numbers
#include <math.h> double fmin(double x, double y); float fminf(float x, float y); long double fminl(long double x, long double y); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): fmin(), fminf(), fminl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L