c99 [ flag... ] file... -lm [ library... ] #include <math.h>
double trunc(double x);
float truncf(float x);
long double truncl(long double x);
These functions round their argument to the integer value, in floating format, nearest to but no larger in magnitude than the argument.
Upon successful completion, these functions return the truncated integer value.
If x is NaN, a NaN is returned.
If x is ±0 or ±Inf, x is returned.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
Interface Stability | Standard |
MT-Level | MT-Safe |
math.h(3HEAD), attributes(5), standards(5)