%{
int linenum=1;
int temp_int;
%}
%%

\n     {linenum++;}

[\t ]        /* skip spaces */;
\/\/[^\n]*   /* ignore comments */;

"+"    {return '+';}
"-"    {return '-';} 
"*"    {return '*';} 
"/"    {return '/';} 
")"    {return ')';}
"("    {return '(';}
";"    {return ';';}

[0-9]+   {sscanf(yytext, "%d", &temp_int);
          yylval.int_val = temp_int;
          return INT;}

.  {printf("LEX: unknown input string found in line %d \n", linenum);
    abort();}