February 12, 2003 ISGREATER 3

### NAME

isgreater,isgreaterequal, isless, islessequal, islessgreater,isunordered - compare two floating-point numbers

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```int` isgreater(```real-floating x``, real-floating y`)
```int` isgreaterequal(```real-floating x``, real-floating y`)
```int` isless(```real-floating x``, real-floating y`)
```int` islessequal(```real-floating x``, real-floating y`)
```int` islessgreater(```real-floating x``, real-floating y`)
```int` isunordered(```real-floating x``, real-floating y`)

### DESCRIPTION

Each of the macros isgreater(``), isgreaterequal(``), isless(``), islessequal(``), and islessgreater(``) take arguments ```x` and ```y` and return a non-zero value if and only if its nominal relation on ```x` and ```y` is true. These macros always return zero if either argument is not a number (NaN), but unlike the corresponding C operators, they never raise a floating point exception.

The isunordered(``) macro takes arguments ```x` and ```y` and returns non-zero if and only if neither ```x` nor ```y` are NaNs. For any pair of floating-point values, one of the relationships (less, greater, equal, unordered) holds.

### SEE ALSO

fpclassify(3), math(3), signbit(3)

### STANDARDS

The isgreater(``), isgreaterequal(``), isless(``), islessequal(``), islessgreater(``), and isunordered(``) macros conform to ISO/IEC 9899:1999 (``ISO C99'') .

### HISTORY

The relational macros described above first appeared in NetBSD5.0.