itrunc(3)itrunc(3)NAME
itrunc, uitrunc - truncate a floating-point number
SYNOPSIS
#include <math.h>
int itrunc(
double x ); unsigned int uitrunc(
double x );
LIBRARY
Standard C Library (libc.a)
DESCRIPTION
The itrunc() function returns the signed integer nearest to the double-
precision floating value x in the direction of 0.0. This effectively
truncates x by discarding its fraction component. The uitrunc() func‐
tion also truncates the double x, but returns an unsigned integer
value.
If x is a NaN or a negative value that exceeds the size of a signed
integer, itrunc() returns INT_MIN. If x is a positive value that
exceeds the size of a signed integer, itrunc() returns INT_MAX.
If x is a NaN or a negative value that exceeds the size of an unsigned
integer, uitrunc() returns a zero. If x is a positive value that
exceeds the size of an unsigned integer, itrunc() returns UINT_MAX.
SEE ALSO
Files: float.h, fp.h, limits.h, machine/fpu.h, math.h,
IEEE Standard for Binary Floating-Point Arithmetic
itrunc(3)