%{
#include <stdio.h>
%}
 
%%
 
[0-9]+              { printf("NUMBER\t\t%s\n", yytext); }
[A-Za-z_][A-Za-z0-9_]*   { printf("IDENTIFIER\t%s\n", yytext); }
 
"=="|">="|"<="|"!="       { printf("REL_OP\t%s\n", yytext); }
"="|"+"|"-"|"*"|"/"        { printf("OPERATOR\t%s\n", yytext); }
 
";"|"("|")"|"{"|"}"        { printf("SYMBOL\t\t%s\n", yytext); }
 
[ \t\n]+            ;   /* ignore whitespace */
 
.                   { printf("UNKNOWN\t%s\n", yytext); }
 
%%
 
int main() {
    printf("Enter input:\n");
    yylex();
    return 0;
}
 

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aW50IGEgPSAxMDs=

int a = 10;