NAME

       addbddvarbefore - adds a new variable, before an existing one.

SYNOPSYS

       #include "bdd101.h"
       bddnode ∗addbddvarbefore( BddSystem )
         bddsystem ∗BddSystem;
         bddindex      Index;

PARAMETERS

       BddSystem           The bdd system.

       Index               The bdd index of an existing variable.

DESCRIPTION

       addbddvarbefore  creates  a new variable, with the number BddSystem->INDEX_TO_VAR[ Index ]
       in the bdd system BddSystem.  If a null pointer is given, the default bdd system is used.

RETURN VALUE

       addbddvarbefore returns a pointer to the bdd node of the new variable.

ERRORS

       "no more variables, error !"
              There is no variable number left.
       "index xxx out of range, error !"
              The Index parameter must be a valid index.

EXAMPLE

       #include "bdd101.h"
          bddsystem  ∗BddSystem;
          bddnode    ∗BddNode1;
          bddnode    ∗BddNode2;
          BddSystem  = createbddsystem( 100, 1000, 100, 50000 );
          BddNode1 = addbddvarfirst( (bddsystem ∗)0 );
          BddNode2 = addbddvarbefore( (bddsystem ∗)0, BddNode1->INDEX );
          destroybddsystem( (bddsystem ∗)0 );

SEE ALSO

       bdd(1)