%{
#include <stdio.h>
%}
 
%%
 
int|float|char|double   { printf("Data Type: %s\n", yytext); }
if|else|for|while       { printf("Keyword: %s\n", yytext); }
[0-9]+                  { printf("Number: %s\n", yytext); }
[a-zA-Z_][a-zA-Z0-9_]*  { printf("Identifier: %s\n", yytext); }
[(),;{}]                { printf("Punctuation: %s\n", yytext); }
[ \t\n]                 ; // Ignore whitespace and newline characters
.                       { printf("Unknown: %s\n", yytext); }
 
%%
 
int yywrap() {
    return 1;
}
 
int main(int argc, char *argv[]) {
    ++argv, --argc;
    if (argc > 0)
        yyin = fopen(argv[0], "r");
    else
        yyin = stdin;
    yylex();
    return 0;
}
 

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