Mfcalc Rules (Bison 3.8.1)

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2.5.2 Grammar Rules for `mfcalc`

Here are the grammar rules for the multi-function calculator. Most of them are copied directly from calc; three rules, those which mention VAR or FUN, are new.

%% /* The grammar follows. */

input:
 %empty
| input line
;

line:
 '\n'
| exp '\n' { printf ("%.10g\n", 1ドル); }
| error '\n' { yyerrok; }
;

exp:
 NUM
| VAR { $$ = 1ドル->value.var; }
| VAR '=' exp { $$ = 3ドル; 1ドル->value.var = 3ドル; }
| FUN '(' exp ')' { $$ = 1ドル->value.fun (3ドル); }
| exp '+' exp { $$ = 1ドル + 3ドル; }
| exp '-' exp { $$ = 1ドル - 3ドル; }
| exp '*' exp { $$ = 1ドル * 3ドル; }
| exp '/' exp { $$ = 1ドル / 3ドル; }
| '-' exp %prec NEG { $$ = -2ドル; }
| exp '^' exp { $$ = pow (1,ドル 3ドル); }
| '(' exp ')' { $$ = 2ドル; }
;

/* End of grammar. */
%%