blob: f45e23f454ddd9277cf631382d5a3b5b0be3c477 (
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|
%{
#include <stdio.h>
#include <stdlib.h>
int yylex();
int yyerror(char *);
%}
%token ADD SUB MUL DIV NUM
%left ADD SUB MUL DIV
%%
R: E {
printf("result: %d", $$);
return 0;
}
E: E ADD T { $$ = $1 + $3; }
| E SUB T { $$ = $1 - $3; }
| T
;
T: T MUL NUM { $$ = $1 * $3; }
| T DIV NUM { $$ = $1 / $3; }
| NUM { $$ = $1; }
;
%%
int main() {
yyparse();
}
int yyerror(char *s) {
printf("error: %s", s);
exit(0);
}
|
