Zdrojový program v YACCu
%token INTEGER
%token ID
%left ‘+’
%left ‘*’
%%
expr : expr ‘+’ expr {$$ = $1 + $3}
     | expr ‘*’ expr {$$ = $1 * $3}
     | ‘(’ expr ‘)’  {$$ = $2}
     | INTEGER
     | ID
%%
int yylex () { … }
69/69