字符串分割

#include <iostream>
#include <vector>
#include <string>
using namespace std;

int main()
{
    string str;
    vector<vector<char>> vv;
    while (getline(cin, str))
    {
        int num = str.size();
        int cnt = 0;
        while (num >  0)
        {
            vector<char> v;
            for (int i = 0; i < 8; i++)
            {
                if (num <= 0)  //不够8个的， 后面补0
                {
                    v.push_back('0');
                }
                else
                {
                    v.push_back(str[cnt++]);
                }
                num--;
            }
            vv.push_back(v);
        }
    }
    for (int i = 0; i < vv.size(); i++)
    {
        for (int j = 0; j < 8; j++)
        {
            cout << vv[i][j];
        }
        cout << endl;
    }
    return 0;
}