PAT 1001. A+B Format (20)

题目地址： http://www.patest.cn/contests/pat-a-practise/1001

我乱搞的， 复习stringstream

 1 #include<cstdio>

 2 #include<sstream>

 3 #include<iostream>

 4 

 5 using namespace std;

 6 

 7 const int SPLITOR = 3;

 8 const string comma = ",";

 9 void print(string s)

10 {

11     int len = s.size();

12     int tmp = len;

13     int r = len % SPLITOR;

14     int index = 0;

15     if (s[index] == '-')

16     {

17         --tmp;

18         cout << s[index++];

19         r = (len - 1) % SPLITOR;

20     }

21     if (r && tmp > SPLITOR)

22     {

23         for (int i = 0; i < r; ++i)

24             cout << s[index++];

25         cout << comma;

26     }

27     int x = 1;

28     for (; index < len; ++index)

29     {

30         cout << s[index];

31         if (!(x++ % SPLITOR) && index < len - 1)

32         {

33             cout << comma;

34         }

35     }

36     cout << endl;

37 

38 }

39 int main()

40 {

41     int a, b, c;

42     while(cin >> a >> b)

43     {

44         c = a + b;

45         stringstream ss;

46         ss << c;

47         string str = ss.str();

48         print(str);

49 

50     }

51     return 0;

52 }