---
name: "ieeeck.f"
section: "3"
platform: "linux"
package: "lapack-doc"
version: "3.12.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/ieeeck.f"
---

# ieeeck.f(3)

## NAME

SRC/ieeeck.f

## SYNOPSIS

### Functions/Subroutines

integer function **ieeeck** (ispec, zero, one)\
 **IEEECK**

## Function/Subroutine Documentation

### integer function ieeeck (integer ispec, real zero, real one)

**IEEECK**

**Purpose:**

```
!>
!> IEEECK is called from the ILAENV to verify that Infinity and
!> possibly NaN arithmetic is safe (i.e. will not trap).
!>
```

**Parameters**

*ISPEC*

```
!>          ISPEC is INTEGER
!>          Specifies whether to test just for infinity arithmetic
!>          or whether to test for infinity and NaN arithmetic.
!>          = 0: Verify infinity arithmetic only.
!>          = 1: Verify infinity and NaN arithmetic.
!>
```

*ZERO*

```
!>          ZERO is REAL
!>          Must contain the value 0.0
!>          This is passed to prevent the compiler from optimizing
!>          away this code.
!>
```

*ONE*

```
!>          ONE is REAL
!>          Must contain the value 1.0
!>          This is passed to prevent the compiler from optimizing
!>          away this code.
!>
!>  RETURN VALUE:  INTEGER
!>          = 0:  Arithmetic failed to produce the correct answers
!>          = 1:  Arithmetic produced the correct answers
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **81** of file **ieeeck.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.