NAME

trunc — truncate to integer value

SYNOPSIS

#include <math.h>

double
trunc(double x);

long double
truncl(long double x);

float
truncf(float x);

DESCRIPTION

The trunc() functions return the integral value nearest to but no larger in magnitude than x.

SPECIAL VALUES

trunc(±0) returns ±0.

trunc(±infinity) returns ±infinity.

VECTOR OPERATIONS

If you need to apply the trunc() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may give significantly better performance:

#include <Accelerate/Accelerate.h>

vFloat vintf(vFloat x);
void vvintf(float *y, const float *x, const int *n);
void vvint(double *y, const double *x, const int *n);

SEE ALSO

ceil(3), floor(3), round(3), math(3)

STANDARDS

The trunc() functions conform to ISO/IEC 9899:2011.