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+/* basic example - non-reentrant version */
+%{
+ int num_lines = 0, num_chars = 0;
+%}
+%option noyywrap
+%%
+\n ++num_lines; ++num_chars;
+. ++num_chars;
+
+%%
+
+int main() {
+ yylex();
+ printf( "# of lines = %d, # of chars = %d\n",
+ num_lines, num_chars );
+}