在字符串中找出連續最長的數字串

/**************************************************************
 * 華爲筆試：在字符串中找出連續最長的數字串
 **************************************************************/
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;


int main()
{
    string in;
    cin >> in;

    int maxLen = 0;
    string out;

    for (int i = 0; i < in.size(); i++)
    {
        int len = 0;
        string tmp;
        while (i < in.size() && in[i] >= '0' && in[i] <= '9')
        {
            tmp += in[i];
            len++;
            i++;
        }
        if (len >= maxLen)
        {
            maxLen = len;
            out = tmp;
        }
    }
    cout << out << endl;
    cout << maxLen << endl;
}