27 lines
1.1 KiB
Groff
27 lines
1.1 KiB
Groff
.TH ISLESSGREATER 3 "December 18, 2009"
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.UC 4
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.SH NAME
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islessgreater, isgreater, isgreaterequal, isless, islessequal, isunordered \- order floating point numbers
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.SH SYNOPSIS
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.nf
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.ft B
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#include <math.h>
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int isgreater(double \fIx\fP, double \fIy\fP);
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int isgreaterequal(double \fIx\fP, double \fIy\fP);
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int isless(double \fIx\fP, double \fIy\fP);
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int islessequal(double \fIx\fP, double \fIy\fP);
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int islessgreater(double \fIx\fP, double \fIy\fP);
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int isunordered(double \fIx\fP, double \fIy\fP);
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.fi
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.SH DESCRIPTION
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These functions compare the specified floating point numbers \fIx\fP and
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\fIy\fP. They differ from the regular comparison operators in that they
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recognize and additional 'unordered' relationship between the numbers if one of
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them is NaN. As a consequence, these functions do not raise floating point
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expceptions and can be safely used with NaN values.
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.SH "RETURN VALUE"
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The functions return a non-zero value if and only if the relationship specified
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in the name holds between \fIx\fP and \fIy\fP. All functions except for
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'isunordered' return zero if either of the numbers is NaN.
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