1TRUNC(P) POSIX Programmer's Manual TRUNC(P)
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6 trunc, truncf, truncl - round to truncated integer value
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9 #include <math.h>
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11 double trunc(double x);
12 float truncf(float x);
13 long double truncl(long double x);
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17 These functions shall round their argument to the integer value, in
18 floating format, nearest to but no larger in magnitude than the argu‐
19 ment.
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22 Upon successful completion, these functions shall return the truncated
23 integer value.
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25 If x is NaN, a NaN shall be returned.
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27 If x is ±0 or ±Inf, x shall be returned.
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30 No errors are defined.
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32 The following sections are informative.
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35 None.
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38 None.
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41 None.
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44 None.
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47 The Base Definitions volume of IEEE Std 1003.1-2001, <math.h>
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50 Portions of this text are reprinted and reproduced in electronic form
51 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
52 -- Portable Operating System Interface (POSIX), The Open Group Base
53 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
54 Electrical and Electronics Engineers, Inc and The Open Group. In the
55 event of any discrepancy between this version and the original IEEE and
56 The Open Group Standard, the original IEEE and The Open Group Standard
57 is the referee document. The original Standard can be obtained online
58 at http://www.opengroup.org/unix/online.html .
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62IEEE/The Open Group 2003 TRUNC(P)