NAME

floor, floorf, floorl —

largest integral value less than or equal to x

LIBRARY

Math Library (libm, -lm)

#include <math.h>

double
floor(double x);

float
floorf(float x);

long double
floorl(long double x);

The floor(), floorf() and floorl() functions return the largest integral value less than or equal to x, expressed as a floating-point number.

The floor() function conforms to ISO/IEC 9899:1990 (“ISO C90”). The floorf() and floorl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).