PAT (Advanced Level) Practise 1001. A+B Format (20)

1001. A+B Format (20)

时间限制400 ms
内存限制65536 kB
代码长度限制16000 B
判题程序Standard作者CHEN, Yue
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).InputEach input file contains one test case. Each case contains a pair of integers a and b where -1000000 <= a, b <= 1000000. The numbers are separated by a space.OutputFor 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

#include <iostream>
#include <string>
#include <sstream>

using namespace std;

int main()
{
int a,b;
cin>>a>>b;
int c = a + b;
stringstream strStream;
strStream<<c;         //int转string的方法！
string s = strStream.str();

for(int i=s.size()-3; i>0 && s[i-1] !='-'; i -= 3)
s.insert(i, ",");

cout<<s<<endl;
return 0;
}