- %{
- #include <stdio.h>
- #include <stdlib.h>
- %}
- %token NUMBER
- %left '+' '-'
- %left '*' '/'
- %%
- input:
- | input expr '\n' { printf("Postfix Notation: %s\n", $2); }
- ;
- expr: NUMBER { $$ = $1; }
- | expr '+' expr { asprintf(&$$, "%s %s +", $1, $3); free($1); free($3); }
- | expr '-' expr { asprintf(&$$, "%s %s -", $1, $3); free($1); free($3); }
- | expr '*' expr { asprintf(&$$, "%s %s *", $1, $3); free($1); free($3); }
- | expr '/' expr { asprintf(&$$, "%s %s /", $1, $3); free($1); free($3); }
- ;
- %%
- int main() {
- yyparse();
- return 0;
- }
- int yyerror(char *s) {
- printf("Error: %s\n", s);
- return 0;
- }
[text] 2nd
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