%{
#include <stdio.h>
#include <string.h>
 
int scope = 0;
%}
 
%%
 
"{"             { scope++; printf("Entering scope level %d\n", scope); }
 
"}"             { 
                    printf("Exiting scope level %d\n", scope); 
                    scope--; 
                }
 
"int"|"float"|"char"|"double"   { printf("Data type: %s\n", yytext); }
 
("int"|"float"|"char"|"double")[ \t]+[a-zA-Z_][a-zA-Z0-9_]*";" {
    printf("Variable declared: %s at scope level %d\n", yytext, scope);
}
 
[a-zA-Z_][a-zA-Z0-9_]*   {
    printf("Identifier: %s (scope %d)\n", yytext, scope);
}
 
[ \t]+      ;
 
\n          ;
 
.           ;
 
%%
 
int main() {
    printf("Enter source code:\n");
    yylex();
    return 0;
}
 
int yywrap() {
    return 1;
}

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int a;
{
    float b;
    {
        char c;
    }
}