%{
#include <stdio.h>
%}
 
letter      [a-zA-Z]
digit       [0-9]
id          {letter}({letter}|{digit})*
number      {digit}+(\.{digit}+)? 
 
%%
 
"int"|"float"|"char"|"if"|"else"|"while"|"for"|"return"|"void"
            { printf("Keyword: %s\n", yytext); }
 
{id}        { printf("Identifier: %s\n", yytext); }
 
{number}    { printf("Number: %s\n", yytext); }
 
"+"|"-"|"*"|"/"|"="|"=="|"!="|"<"|">"|"<="|">="
            { printf("Operator: %s\n", yytext); }
 
";"|","|"("|")"|"{"|"}"|"["|"]"
            { printf("Special Symbol: %s\n", yytext); }
 
[ \t\n]+    ;    /* Ignore whitespace */
 
.           { printf("Unknown Character: %s\n", yytext); }
 
%%
 
int yywrap()
{
    return 1;
}
 
int main()
{
    printf("Enter the input:\n");
    yylex();
    return 0;
}

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