%{
#include<stdio.h> 
%}
 
%%
"+"|"-"|"*"|"/"|"="|"==" { printf("Operator: %s\n", yytext); }
"("|")"|"{"|"}"|";" { printf("Symbol: %s\n", yytext); }
"include"|"main"|"printf"|"return" { printf("Keyword: %s\n", yytext); }
[0-9]+ { printf("Number: %s\n", yytext); }
[a-zA-Z_][a-zA-Z0-9_]* { printf("Identifier: %s\n", yytext); }
[ \t\n]+ ; /* Ignore whitespace */
%%
 
int main(int argc, char *argv[]) {
if (argc != 2) {
printf("Usage: %s \n", argv[0]);
return 1;
}
 
FILE *file = fopen(argv[1], "r");
if (!file) {
perror("Error opening file");
return 1;
}
 
yyin = file; // Set the input stream for flex
yylex();
fclose(file);
return 0;
}
 
int yywrap() {
return 1;
}

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