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  11 .TH islessequal 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions"
  12 .SH NAME
  13 islessequal \- test if x is less than or equal to y
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
  18 #include <math.h>
  19 
  20 \fBint\fR \fBislessequal\fR(\fBreal-floating\fR \fIx\fR, \fBreal-floating\fR \fIy\fR);
  21 .fi
  22 
  23 .SH DESCRIPTION
  24 .sp
  25 .LP
  26 The \fBislessequal()\fR macro determines whether its first argument is less
  27 than or equal to its second argument. The value of \fBislessequal\fR(\fIx\fR,
  28 \fIy\fR) is equal to (\fIx\fR) \(<= (\fIy\fR); however, unlike (\fIx\fR) \(<=
  29 (\fIy\fR), \fBislessequal\fR(\fIx\fR, \fIy\fR) does not raise the invalid
  30 floating-point exception when \fIx\fR and \fIy\fR are unordered.
  31 .SH RETURN VALUES
  32 .sp
  33 .LP
  34 Upon successful completion, the \fBislessequal()\fR macro returns the value of
  35 (\fIx\fR) \(<= (\fIy\fR).
  36 .sp
  37 .LP
  38 If \fIx\fR or \fIy\fR is NaN, 0 is returned.
  39 .SH ERRORS
  40 .sp
  41 .LP
  42 No errors are defined.
  43 .SH USAGE
  44 .sp
  45 .LP
  46 The relational and equality operators support the usual mathematical
  47 relationships between numeric values. For any ordered pair of numeric values,
  48 exactly one of the relationships (less, greater, and equal) is true. Relational
  49 operators can raise the invalid floating-point exception when argument values
  50 are NaNs. For a NaN and a numeric value, or for two NaNs, just the unordered
  51 relationship is true. This macro is a quiet (non-floating-point exception
  52 raising) version of a relational operator. It facilitates writing efficient
  53 code that accounts for quiet NaNs without suffering the invalid floating-point
  54 exception. In the \fBSYNOPSIS\fR section, \fBreal-floating\fR indicates that
  55 the argument is an expression of \fBreal-floating\fR type.
  56 .SH ATTRIBUTES
  57 .sp
  58 .LP
  59 See \fBattributes\fR(5) for descriptions of the following attributes:
  60 .sp
  61 
  62 .sp
  63 .TS
  64 tab() box;
  65 cw(2.75i) |cw(2.75i) 
  66 lw(2.75i) |lw(2.75i) 
  67 .
  68 ATTRIBUTE TYPEATTRIBUTE VALUE
  69 _
  70 Interface StabilityStandard
  71 _
  72 MT-LevelMT-Safe
  73 .TE
  74 
  75 .SH SEE ALSO
  76 .sp
  77 .LP
  78 \fBisgreater\fR(3M), \fBisgreaterequal\fR(3M), \fBisless\fR(3M),
  79 \fBislessgreater\fR(3M), \fBisunordered\fR(3M), \fBmath.h\fR(3HEAD),
  80 \fBattributes\fR(5), \fBstandards\fR(5)