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

# getbddvarbyindex(3)

converts bdd index to a variable number.

## NAME

getbddvarbyindex - converts **bdd** index to a variable number.

## SYNOPSYS

```
#include "bdd101.h"
bddindex getbddvarbyindex( BddSystem, Index )
  bddsystem ∗BddSystem;
  bddindex   Index;
```

## PARAMETERS

- *BddSystem*

  The **bdd** system.

- *Index*

  The **bdd** index to convert.

## DESCRIPTION

**getbddvarbyindex** converts the **bdd** index  *Index* *to a variable number, 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-\>INDEX\_TO\_VAR.*\

## RETURN VALUE

**getbddvarbyindex** *returns the variable number of the* **bdd** *index Index.*

## ERRORS

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

The *Index parameter must be a valid index.*

## EXAMPLE

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

## SEE ALSO

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