---
name: "isablunaryoper"
section: "3"
platform: "linux"
package: "alliance"
version: "5.1.1-3"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/isablunaryoper"
---

# isablunaryoper(3)

tests if an operator is unary.

## NAME

isablunaryoper - tests if an operator is unary.

## SYNOPSYS

```
#include "abl101.h"
int isablunaryoper( Oper )
  long Oper;
```

## PARAMETERS

- *Oper*

  Operator number.

## DESCRIPTION

**isablunaryoper** tests if *Oper* is unary.\

## RETURN VALUE

**isablunaryoper** returns 1 if *Oper* is unary, -1 if *Oper* is not a valid number, and 0 otherwise.

## EXAMPLE

```
#include "abl101.h"
  /* displays    0 1 */
  printf( "%d  ", isablunaryoper( ABL_OR  ) );
  printf( "%d0, isablunaryoper( ABL_NOT ) );
```

## SEE ALSO

[**abl**(1)](/abl/1.md)