#include <math.h>#include <float.h>#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024long double fmaxl(long double x, long double y){return fmax(x, y);}#elselong double fmaxl(long double x, long double y){if (isnan(x))return y;if (isnan(y))return x;/* handle signed zeros, see C99 Annex F.9.9.2 */if (signbit(x) != signbit(y))return signbit(x) ? y : x;return x < y ? y : x;}#endif