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trunc(3) [opendarwin man page]

TRUNC(3)						   BSD Library Functions Manual 						  TRUNC(3)

trunc -- truncate to integer value SYNOPSIS
#include <math.h> double trunc(double x); float truncf(float x); DESCRIPTION
The trunc() and truncf() functions return the integral value nearest to but no larger in magnitude than x. SPECIAL VALUES
trunc(+-0) returns +-0. trunc(+-infinity) returns +-infinity. SEE ALSO
ceil(3), ieee(3), rint(3), math(3) STANDARDS
The trunc() and truncf() functions conform to ISO/IEC 9899:1999(E). BSD
January 29, 2003 BSD

Check Out this Related Man Page

trunc(3M)						  Mathematical Library Functions						 trunc(3M)

trunc, truncf, truncl - round to truncated integer value SYNOPSIS
cc [ 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(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
math.h(3HEAD), attributes(5), standards(5) SunOS 5.10 1 Sep 2002 trunc(3M)
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