%{
#include <stdio.h>
%}

%%
[ \t\n]+  printf("White space, length %i\n",yyleng);
"*"    printf("times\n");
"/"    printf("div\n");
"+"    printf("plus\n");
"-"    printf("minus\n");
"("    printf("left parenthesis\n");
")"    printf("right parenthesis\n");
0|([1-9][0-9]*)   printf("integer constant: %s\n",yytext);
[a-zA-Z_][a-zA-Z_]*   printf("identifier: %s\n",yytext);


%%
main(){
  yylex();
}