man3/trunc.3

   1 .\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>.
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  23 .TH TRUNC 3  2001-05-31 "" "Linux Programmer's Manual"
  24 .SH NAME
  25 trunc, truncf, truncl \- round to integer, towards zero
  26 .SH SYNOPSIS
  27 .nf
  28 .B #include <math.h>
  29 .sp
  30 .BI "double trunc(double " x );
  31 .br
  32 .BI "float truncf(float " x );
  33 .br
  34 .BI "long double truncl(long double " x );
  35 .fi
  36 .sp
  37 Compile with \-std=c99; link with \-lm.
  38 .SH DESCRIPTION
  39 These functions round \fIx\fP to the nearest integer
  40 not larger in absolute value.
  41 .SH "RETURN VALUE"
  42 The rounded integer value.
  43 If \fIx\fP is integral, infinite or NaN, \fIx\fP itself is returned.
  44 .SH ERRORS
  45 None.
  46 .SH "CONFORMING TO"
  47 C99.
  48 .SH "SEE ALSO"
  49 .BR ceil (3),
  50 .BR floor (3),
  51 .BR lrint (3),
  52 .BR nearbyint (3),
  53 .BR rint (3),
  54 .BR round (3)