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

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int main() {
    int x = 5;
    if (x > 0) {
        printf("Positive\n");
    } else {
        printf("Non-positive\n");
    }
    return 0;
}