題目連結：https://pintia.cn/problem-sets/994805342720868352/problems/994805528788582400
Calculate a+b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits).
Input Specification:
Each input file contains one test case. Each case contains a pair of integers a and b where −. The numbers are separated by a space.
Output Specification:
For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format.
Sample Input:
-1000000 9
Sample Output:
1 #include <iostream>
2 #include <cstdio>
3 #include <string>
4 #include <cstring>
5 #include <algorithm>
6 #include <stack>
7 using namespace std;
8 int main()
9 {
10 int n,m,sum;
11 while(cin>>n>>m){
12 sum=n+m;
13 if(sum==0){
14 cout<<0<<endl;
15 continue;
16 }
17 int flag=0;
18 if(sum<0){
19 flag=1;
20 sum=-sum;
21 }
22 char c='-';
23 stack<char> s;
24 int t=0;
25 while(sum){
26 c=sum%10+'0';
27 s.push(c);
28 t++;
29 if(t%3==0&&sum/10) s.push(',');
30 sum/=10;
31 }
32 if(flag) s.push('-');
33 while(!s.empty()){
34 cout<<s.top();
35 s.pop();
36 }
37 cout<<endl;
38 }
39 return 0;
40 } 轉載于:https://www.cnblogs.com/shixinzei/p/10770286.html