PAT A1001 A+B Format

题目描述：

　　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 −10?6??≤a,b≤10?6??. 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:
　　-999,991

参考代码：

 1 /****************************************************
 2 PAT A1001 A+B Format
 3 ****************************************************/
 4 #include <iostream>
 5 #include <string>
 6
 7 using namespace std;
 8
 9 int main() {
10     int num1 = 0, num2 = 0, sum = 0;
11
12     cin >> num1 >> num2;
13
14     sum = num1 + num2;
15
16     if (sum < 0) {
17         cout << ‘-‘;
18         sum *= -1;
19     }
20
21     string sumString = to_string(sum);
22     for (int i = 0; i < sumString.size(); ++i) {
23         cout << sumString[i];
24         if ((i + 1) % 3 == sumString.size() % 3 && i != sumString.size() - 1) {
25             cout << ‘,‘;
26         }
27     }
28
29     return 0;
30 }

注意事项：

　　无。

原文地址：https://www.cnblogs.com/mrdragon/p/11412264.html