temp我将as格式化double，但0在输入不带小数点的数字时返回，输入带小数点的数字会导致“无效表达式”。
%{
#include<stdio.h>
#include<math.h>
int valid=0
double temp;
%}
%token num
%left '+''-'
%left '*''/'
%left '^'
%nonassoc UMINUS
%%
expr1: expr { temp=$1; }
expr : expr '+' expr { $$=$1+$3; }
| expr '-' expr { $$=$1-$3; }
| expr '*' expr { $$=$1*$3; }
| expr '/' expr { if($3==0) { valid=1; $$=0; } else { $$=$1/$3; } }
| '(' expr ')' { $$=$2; }
| '-' expr { $$=-1*$2; }
| num { $$=yylval;}
;
%%
#include<stdlib.h>
int yyerror(){
printf("\nInvalid expression!\n");
valid=2;
return 0;
}
int yyparse();
double main(double argc, char *argv[]){
extern FILE *yyin;
++argv;
--argc;
yyin=fopen(argv[0],"r");
yyparse();
if(valid==1){
printf("\nDivision by 0!\n");
}
if(valid==0){
printf("\nValid expression!\n");
printf("The value evaluated is %d\n",temp);
}
return 0;
}