%{
#include <stdio.h>
#include <string.h>
 
int isKeyword(char *str) {
    return strcmp(str, "if") == 0 ||
           strcmp(str, "else") == 0 ||
           strcmp(str, "while") == 0 ||
           strcmp(str, "int") == 0 ||
           strcmp(str, "float") == 0;
}
%}
 
%%
"if"        { printf("Keyword: %s\n", yytext); }
"else"      { printf("Keyword: %s\n", yytext); }
"while"     { printf("Keyword: %s\n", yytext); }
"int"       { printf("Keyword: %s\n", yytext); }
"float"     { printf("Keyword: %s\n", yytext); }
 
[ \t\n]+    ; // Ignore whitespace
 
"("         { printf("Symbol: %s\n", yytext); }
")"         { printf("Symbol: %s\n", yytext); }
"{"         { printf("Symbol: %s\n", yytext); }
"}"         { printf("Symbol: %s\n", yytext); }
";"         { printf("Delimiter: %s\n", yytext); }
 
">="|"<="|"=="|"!="|">"|"<" { printf("Operator: %s\n", yytext); }
"="         { printf("Assignment Operator: %s\n", yytext); }
"*"         { printf("Arithmetic Operator: %s\n", yytext); }
"/"         { printf("Arithmetic Operator: %s\n", yytext); }
 
[0-9]+      { printf("Number: %s\n", yytext); }
 
[a-zA-Z_][a-zA-Z0-9_]* {
    if (isKeyword(yytext))
        printf("Keyword: %s\n", yytext);
    else
        printf("Identifier: %s\n", yytext);
}
 
.           { printf("Unknown: %s\n", yytext); }
%%
 
int main() {
    yylex();
    return 0;
}
 

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aWYoeCZndDswKXt5PXgqMjt9ZWxzZXt5PXgvMjt9Cg==

if(x>0){y=x*2;}else{y=x/2;}