The Open Group Base Specifications Issue 7, 2018 edition
IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008)
Copyright © 2001-2018 IEEE and The Open Group

NAME

isgreater - test if x greater than y

SYNOPSIS

#include <math.h>

int isgreater(real-floating
x, real-floating y);

DESCRIPTION

[CX] [Option Start] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2017 defers to the ISO C standard. [Option End]

The isgreater() macro shall determine whether its first argument is greater than its second argument. The value of isgreater(x, y) shall be equal to (x) > (y); however, unlike (x) > (y), isgreater(x, y) shall not raise the invalid floating-point exception when x and y are unordered.

RETURN VALUE

Upon successful completion, the isgreater() macro shall return the value of (x) > (y).

If x or y is NaN, 0 shall be returned.

ERRORS

No errors are defined.


The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

The relational and equality operators support the usual mathematical relationships between numeric values. For any ordered pair of numeric values, exactly one of the relationships (less, greater, and equal) is true. Relational operators may raise the invalid floating-point exception when argument values are NaNs. For a NaN and a numeric value, or for two NaNs, just the unordered relationship is true. This macro is a quiet (non-floating-point exception raising) version of a relational operator. It facilitates writing efficient code that accounts for NaNs without suffering the invalid floating-point exception. In the SYNOPSIS section, real-floating indicates that the argument shall be an expression of real-floating type.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

isgreaterequal, isless, islessequal, islessgreater, isunordered

XBD <math.h>

CHANGE HISTORY

First released in Issue 6. Derived from the ISO/IEC 9899:1999 standard.

End of informative text.

 

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