题目（9）答案 -转换

这里引用了一个新的库，叫#include “sstream”。
可以同时转换不同类型

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

using namespace std;

string s;
string answer = "";
//3,3,4,2,10,3,4,7
//3,3,4,2,10,3,4,7,5
/*
She was born in 1990-01-02  and  from Beijing city.
*/

string int2str(int aNum)
{
    stringstream res;
    res << aNum;
    string s;
    res >> s;
    return s;
}

int main()
{
    getline(cin, s);
    int length = s.size();
    int sum = 0;
    for(int i = 0; i < length; i++)
    {
        if(s[i] == ' '){
            if(sum != 0){
            	answer += int2str(sum) + ",";
            	sum = 0;
            }
            else
                sum = 0;
        }
        else
            sum++;
    }
    answer += int2str(sum) + ",";
    int ansl = answer.size();
    
    for(int i = 0; i < ansl - 1; i++)
        cout << answer[i];
    cout << endl;
    return 0;
}