August 16, 1999 ISINFF 3

### NAME

isinff, isnanf - test for infinity or not-a-number

### LIBRARY

Math Library (libm, -lm)

### SYNOPSIS

```int` isinff(```float`)
```int` isnanf(```float`)

### DESCRIPTION

The isinff(``) function returns 1 if the number is ``'', otherwise 0.

The isnanf(``) function returns 1 if the number is ``not-a-number'', otherwise 0.

### SEE ALSO

isinf(3), isnan(3), math(3)

### BUGS

Neither the VAX nor the Tahoe floating point have distinguished values for either infinity or not-a-number. These routines always return 0 on those architectures.