clearing parser state bison generated parser

i am controlling c lexer flex-generated, c++ parser bison-generated. i have run-down parser acccept wholly twine input.

i am job parser duty yyparse() loop, reading line line user input. i stop loop quarrel "quit".

the problem i am opposed quarrel doesn't review any rule, following parser stops abruptly, during unbroken iteration starts off during same state, awaiting order stopped (due syntax error) complete.

it works glorious quarrel current matches parser rule.

on syntax blunder i have redefined yyerror() function, displays rudimentary blunder message.

how i pristine state parser quarrel doesn't review any parser rule, during unbroken iteration parser starts afresh?