%{
#include<stdio.h> #include<ctype.h> #define YYSTYPE double
%}
%token num
%left '+' '-'
%left '*' '/'
%right UMINUS
%%
lines:
|lines exp '\n' {printf("%g\n",$2); return 1;}
|lines '\n'
;
exp:exp'+'exp {$$=$1+$3;}
|exp'-'exp {$$=$1-$3;}
|exp'*'exp {$$=$1*$3;}
|exp'/'exp {if($3==0)
{
printf("Divide by zero error\n"); exit(0);
}
$$=$1/$3;
}
|'('exp')' {$$=$2;}
   |'-'exp {$$=-$2;}
  |num;
%%
int yylex()
{
int c; while((c=getchar())==' ');
if((c=='.')||(isdigit(c)))
{
ungetc(c,stdin); scanf("%lf",&yylval); return num;
}
return c;
}
int main()
{
yyparse(); return 0;
}
int yyerror()
{
printf("Error\n"); return 0;
}

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