版本号比较

注意点

• 1.0 < 1.10
• 1.1.1 < 1.1.2

• 1.0 == 1

  思路：利用stringstream和getline结合，按照.为分隔符取出每一部分，转换成Int进行比较

  class Solution {
  public:
    int compareVersion(string version1, string version2) {
        stringstream streamVer1(version1);
        stringstream streamVer2(version2);
        string strVer1, strVer2;
        while (!streamVer1.eof() || !streamVer2.eof())
        {
            int iVer1(0), iVer2(0);
            if (!streamVer1.eof())
            {
                getline(streamVer1, strVer1, ‘.‘);
                iVer1 = stoi(strVer1);
            }
            if (!streamVer2.eof())
            {
                getline(streamVer2, strVer2, ‘.‘);
                iVer2 = stoi(strVer2);
            }
            if (iVer1 > iVer2)
            {
                return 1;
            }
            if (iVer1 < iVer2)
            {
                return -1;
            }
        }
        return 0;
    }
  };

Compare Version Numbers

原文：http://www.cnblogs.com/flyjameschen/p/4318197.html