NAME

       isbddvarinsupport - tests if a variable appears in a bdd.

SYNOPSYS

       #include "bdd101.h"
       int isbddvarinsupport( BddSystem, BddNode, Variable )
         bddsystem ∗BddSystem;
         bddnode   ∗BddNode;
         bddvar     Variable;

PARAMETERS

       BddSystem           The bdd system.

       BddNode             The bdd node.

       Variable            The variable number.

DESCRIPTION

       isbddvarinsupport  tests if the variable number Variable appears in the support of the bdd
       node BddNode, in the bdd system BddSystem.  If a null pointer is given,  the  default  bdd
       system is used.

RETURN VALUE

       isbddvarinsupport returns 1 if Variable appears, 0 otherwise.

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;
          bddcircuit ∗BddCircuit;
          bddnode    ∗BddNode;
          bddnode    ∗BddVariable;
          chain_list ∗Expr;
          bddvar         Variable;
          BddSystem  = createbddsystem( 100, 1000, 100, 50000 );
          BddCircuit = createbddcircuit( "hello_world", 10, 10, BddSystem );
          Expr = createablbinexpr( ABL_AND,
                                   createablatom( "i0" ),
                                   createablatom( "i1" ) );
          BddNode = addbddcircuitabl( BddCircuit, Expr );
          freeablexpr( Expr );
          BddVariable = searchbddcircuitin( (bddcircuit ∗)0, "i0" );
          Variable = getbddvarbyindex( (bddsystem ∗ 0), BddVariable->INDEX ) );
          /* displays 1 */
          printf( "%d", isbddvarinsupport( (bddsystem ∗)0, BddNode, Variable ) );
          destroybddsystem( (bddsystem ∗)0 );
          destroybddcircuit( (bddcircuit ∗)0 );

SEE ALSO

       bdd(1)