%{
#include <stdio.h>
#include <stdlib.h>
%}
 
%option noyywrap
 
%%
"auto"        { printf("Keyword: %s\n", yytext); }
"break"       { printf("Keyword: %s\n", yytext); }
"case"        { printf("Keyword: %s\n", yytext); }
"char"        { printf("Keyword: %s\n", yytext); }
"const"       { printf("Keyword: %s\n", yytext); }
"continue"    { printf("Keyword: %s\n", yytext); }
"return"      { printf("Keyword: %s\n", yytext); }
"if"          { printf("Keyword: %s\n", yytext); }
"else"        { printf("Keyword: %s\n", yytext); }
"for"         { printf("Keyword: %s\n", yytext); }
"while"       { printf("Keyword: %s\n", yytext); }
"int"         { printf("Keyword: %s\n", yytext); }
"float"       { printf("Keyword: %s\n", yytext); }
"double"      { printf("Keyword: %s\n", yytext); }
"void"        { printf("Keyword: %s\n", yytext); }
"=="          { printf("Operator: %s\n", yytext); }
"!="          { printf("Operator: %s\n", yytext); }
"<="          { printf("Operator: %s\n", yytext); }
">="          { printf("Operator: %s\n", yytext); }
"+"           { printf("Operator: %s\n", yytext); }
"-"           { printf("Operator: %s\n", yytext); }
"*"           { printf("Operator: %s\n", yytext); }
"/"           { printf("Operator: %s\n", yytext); }
"="           { printf("Operator: %s\n", yytext); }
[0-9]+        { printf("Integer Constant: %s\n", yytext); }
\"([^\\\"]|\\.)*\" { printf("String Constant: %s\n", yytext); }
[a-zA-Z_][a-zA-Z0-9_]* { printf("Identifier: %s\n", yytext); }
[ \t\n]       { /* Ignore whitespace */ }
.             { printf("Unknown character: %s\n", yytext); }
 
%%
 
int main(int argc, char **argv) {
    yylex();
    return 0;
}
 
int yyerror(char *s) {
    fprintf(stderr, "Error: %s\n", s);
    return 0;
}
 

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int main() {
    int a = 5;
    float b = 3.14;
    if (a > b) {
        printf("Hello, World!");
    }
    return 0;
}