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man pages section 3: Extended Library Functions, Volume 2

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Updated: Thursday, June 13, 2019
 
 

trunc(3M)

Name

trunc, truncf, truncl - round to truncated integer value

Synopsis

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

double trunc(double x);
float truncf(float x);
long double truncl(long double x);

Description

These functions round their argument to the integer value, in floating format, nearest to but no larger in magnitude than the argument.

Return Values

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.

Errors

No errors are defined.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Interface Stability
Committed
Availability
system/library/math
MT-Level
MT-Safe
Standard

See Also

math.h(3HEAD), attributes(7), standards(7)