floor(3M)

Name

Synopsis

c99 [ flag... ] file... –lm [ library... ]
#include <math.h>

double floor(double x);

float floorf(float x);

long double floorl(long double x);

Description

These functions compute the largest integral value not greater than x.

Return Values

Upon successful completion, these functions return the largest integral value not greater than x, expressed as a double, float, or long double, as appropriate for the return type of the function.

If x is NaN, a NaN is returned.

If x is ±Inf or ±0, x is returned.

Attributes

See attributes(5) for descriptions of the following attributes:

See also

ceil(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), math.h(3HEAD), attributes(5), standards(5)