1 #include <cstdio>
2 #include <cstring>
3 #include <iostream>
4 using namespace std;
5 char s[105];
6 int main(){
7 bool is_native;
8 int len, point, endline;
9 while(~scanf("%[^\n]",s)){
10 getchar();//吃回车
11 if(s[0] == '-') is_native = true;//判断负数
12 else is_native = false;
13 point = len = strlen(s);//当没有小数点时，len处为小数点
14 for(int i = 0; s[i]; ++i)//找小数点
15 if(s[i] == '.'){
16 point = i;
17 break;
18 }
19 endline = point;//.999
20 if(point-1 >= 0 && s[point-1] >= '0' && s[point-1] <= '9')//0.999
21 endline = point-1;
22 for(int i = 0; i < point; ++i)//00000123
23 if(s[i] > '0' && s[i] <= '9'){
24 endline = i;
25 break;
26 }
27 s[point] = '.';//len处可能没有.
28 for(int i = point+1; i <= point+3; ++i)//处理小数点后三位
29 s[i] = s[i]?:'0';
30 if(s[point+3] > '4') ++s[point+2];//小数点后第二位的进位
31 int up = s[point+3] = 0;
32 for(int i = point+2; i >= endline; --i){//依次进位
33 if(i == point) continue;
34 s[i] += up;
35 up = (s[i]-'0')/10;
36 s[i] = (s[i]-'0')%10 + '0';
37 }
38 bool is_all_zero = true;//0000000.0之类的
39 for(int i = point-1; i >= endline; --i)
40 if(s[i] != '0') is_all_zero = false;
41 if(up) is_all_zero = false;//0.999
42 int num = (point+2)%3;//找出在那加入,
43 if(is_native) putchar('(');
44 if(up){
45 printf("%d",up);
46 if(s[0] != '.' && (endline+2)%3 == num)
47 putchar(',');
48 }
49 int i;
50 if(is_all_zero) { putchar('0'); i = point; }//前面都是零输出一个零，并从小数点处开始继续输出
51 else i = endline;//否则从开头开始
52 for(; i < point+3; ++i){
53 putchar(s[i]);
54 if(i < point-1 && i%3 == num)
55 putchar(',');
56 }
57 if(is_native) putchar(')');
58 putchar('\n');
59 memset(s,0,sizeof(s));//清空数组，防止干扰
60 }
61 return 0;
62 }
