1001_A + B Format (20 minutes) [Stack]

And taking two numbers, the results obtained by the standard output format.

Vertebral standard format:

　　abs (sum) <1000, according to the original value output

　　abs (sum)> time = 1000, from the start bit, each of three insert a "," 

       

 1 #include<iostream>
 2 #include<vector>
 3 #include<cstdio>
 4 #include<cstdlib>
 5 #include<cstring>
 6 using namespace std;
 7 
 8 int main()
 9 {
10     int num;
11     long long a, b;
12     while (cin >> a >> b) {
13         long long sum = a + b;
14         if (sum == 0|| abs(sum) < 1000) {
15             cout << sum << endl;
16             continue;
17         }
18         num = 1; vector<char> arry;
19         char flag = 0;
20         if (sum < 0) flag = 1;
21         sum = abs(sum);
22         while (sum) {
23             arry.push_back(sum % 10 + '0');
24             sum /= 10;
25             if (num++ % 3 == 0) arry.push_back(',');
26         }
27         if (num % 3 == 1) arry.pop_back();
28         if (flag) cout << '-';
29         for (int i = arry.size() - 1; i >= 0; i--) cout << arry[i];
30         cout << endl;
31     }
32     return 0;
33 }