%{
#include <stdio.h>
#include <stdlib.h>
%}
DIGIT [0-9]
ID [a-zA-Z_][a-zA-Z0-9_]*
%%
if|then|else|int|while|char { printf("%s is a keyword\n", yytext); }
{DIGIT}+ { printf("%s is a number\n", yytext); }
{DIGIT}+"."{DIGIT}+ { printf("%s is a floating point number\n", yytext); }
{ID} { printf("%s is an identifier\n", yytext); }
[ \t\n]+ { /* ignore whitespace */ }
[();{}] { printf("%s is a separator\n", yytext); }
[,] { printf("%s is a delimiter\n", yytext); }
%%
int main()
{
printf("Enter input:\n");
yylex();
return 0;
}
int yywrap(void)
{
return 1;
}

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