mirror of
https://github.com/ivabus/pantry
synced 2024-11-30 04:05:06 +03:00
20 lines
384 B
Text
20 lines
384 B
Text
|
%{ #include <iostream>
|
||
|
|
using namespace std;
|
||
|
|
extern void yyerror (char *s);
|
||
|
|
extern int yylex ();
|
||
|
|
%}
|
||
|
|
%start prog
|
||
|
|
%%
|
||
|
|
prog: // empty
|
||
|
|
| prog expr '\n' { cout << "pass"; exit(0); }
|
||
|
|
;
|
||
|
|
expr: '(' ')'
|
||
|
|
| '(' expr ')'
|
||
|
|
| expr expr
|
||
|
|
;
|
||
|
|
%%
|
||
|
|
char c;
|
||
|
|
void yyerror (char *s) { cout << "fail"; exit(0); }
|
||
|
|
int yylex () { cin.get(c); return c; }
|
||
|
|
int main() { yyparse(); }
|