- // calculator.l
- %{
- #include "y.tab.h"
- %}
- %%
- "+" { return PLUS; }
- "-" { return MINUS; }
- "*" { return MULT; }
- "/" { return DIV; }
- "(" { return LPAREN; }
- ")" { return RPAREN; }
- [0-9]+ { yylval = atoi(yytext); return NUMBER; }
- [ \t\n] ;
- . { return yytext[0]; }
- %%
- int yywrap() {
- return 1;
- }
- // calculator.y
- %{
- #include <stdio.h>
- #include <stdlib.h>
- %}
- %token NUMBER PLUS MINUS MULT DIV LPAREN RPAREN
- %left PLUS MINUS
- %left MULT DIV
- %%
- calc : expr { printf("Result: %d\n", $1); }
- ;
- expr : expr PLUS expr { $$ = $1 + $3; }
- | expr MINUS expr { $$ = $1 - $3; }
- | expr MULT expr { $$ = $1 * $3; }
- | expr DIV expr { $$ = $1 / $3; }
- | LPAREN expr RPAREN { $$ = $2; }
- | NUMBER { $$ = $1; }
- ;
- %%
- int main() {
- yyparse();
- return 0;
- }
- int yyerror(char *s) {
- printf("Error: %s\n", s);
- return 0;
- }
[text] calc
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