%token INT VAR ADD EQ
%%
statement : VAR
                    {Push();}
            EQ
            int_var
                    {Push();}
            ADD
            int_var
                    {Push();
                    first = Pop();
                    second = Pop();
                    third = Pop();
                    printf ("ADD %s TO %s GIVING %s.\n",
                            first, second, third);}
           ;
int_var    : INT
           | VAR
           ;
%%
#include "lex.yy.c"
#include "three.c"

char *first, *second, *third;