floor, floorf, floorl - floor function
c99 [ flag... ] file... –lm [ library... ] #include <math.h> double floor(double x);
float floorf(float x);
long double floorl(long double x);
These functions compute the largest integral value not greater than x.
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.
See attributes(7) for descriptions of the following attributes:
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math.h(3HEAD), ceil(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M), attributes(7), standards(7)