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

# getbddvarindex(3)

converts a variable number in a bdd index.

## NAME

getbddvarindex - converts a variable number in a **bdd** index.

## SYNOPSYS

```
#include "bdd101.h"
bddindex getbddvarindex( BddSystem, Variable )
  bddsystem ∗BddSystem;
  bddvar     Variable;
```

## PARAMETERS

- *BddSystem*

  The **bdd** system.

- *Variable*

  The variable number to convert.

## DESCRIPTION

**getbddvarindex** converts the variable number *Variable* to a **bdd** index, in the **bdd** system *BddSystem*. If a null pointer is given, the default **bdd** system is used. The function uses simply the translation table *BddSystem*-\>VAR\_TO\_INDEX.\

## RETURN VALUE

**getbddvarindex** returns the **bdd** index of *Variable*.

## ERRORS

**"variable xxx out of range, error !"**

The *Variable* parameter must be less or equal to the *BddSystem-\>NUMBER\_VAR* field.

## EXAMPLE

```
#include "bdd101.h"
   bddsystem  ∗BddSystem;
   bddnode    ∗BddNode;
   BddSystem  = createbddsystem( 100, 1000, 100, 50000 );
   BddNode = addbddvar( (bddsystem ∗)0, 0 );
   /* displays 2 */
   printf( "%d", getbddvarindex( (bddsystem ∗)0, 0 ) );
   destroybddsystem( (bddsystem ∗)0 );
```

## SEE ALSO

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