%{ 
#include<stdio.h>
%} 
%% 
"int"|"float"|"char" { printf("<KEYWORD,%s>\n",yytext);} 
[0-9]+ { printf("<NUMBER,%s>\n",yytext);}
[a-zA-Z0-9_]* { printf("<IDENTIFIER,%s>\n",yytext);} 
"+"|"-"|"*"|"/"|"=" { printf("<OPERATOR,%s>\n",yytext);} 
"("|")"|"{"|"}"|";"|"#"|","|"."|"<"|">" { printf("<SYMBOL,%s>\n",yytext);}
[\t\n]+ 
%% 
int main(int argc,char **argv) 
{ 
if (argc<2) 
{ 
fprintf(stderr,"Usage:%s \n",argv[0]); 
exit(1); } 
FILE *file = fopen(argv[1],"r");
if (!file)
{
perror("ERROR while opening the file");
exit(1);
} 
yyin=file;
yylex(); 
fclose(file); 
return 0;
}

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