%{
#include <stdio.h>
%}
 
DIGIT   [0-9]
LETTER  [a-zA-Z]
ID      {LETTER}({LETTER}|{DIGIT})*
NUM     {DIGIT}+
 
%%
int|float|char|double|if|else|while|for|return|void
        { printf("Keyword     : %s\n", yytext); }
 
{ID}    { printf("Identifier  : %s\n", yytext); }
 
{NUM}   { printf("Number      : %s\n", yytext); }
 
"=="|"="|"+"|"-"|"*"|"/"|"<"|">"|"<="|">="
        { printf("Operator    : %s\n", yytext); }
 
";"|","|"("|")"|"{"|"}"
        { printf("Separator   : %s\n", yytext); }
 
[ \t\n]+   ;   /* Ignore spaces */
 
.       { printf("Unknown     : %s\n", yytext); }
%%
 
int main(void) {
    printf("Enter input (press Ctrl+D / EOF after input):\n");
    yylex();
    return 0;
}
 
int yywrap(void) {
    return 1;
}
 

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

aW50IGEgPTEwOwo=

int a =10;