165. Compare Version Numbers 版本号比较

int compareVersion(string ver1, string ver2) {
    stringstream s1(ver1);
    stringstream s2(ver2);

    string v1, v2;
    while(!s1.eof() || !s2.eof()) {
        if (!s1.eof())
            getline(s1, v1, '.');
        else
            v1="0";
        if (!s2.eof())
            getline(s2, v2, '.');
        else
            v2="0";

        int n1=stoi(v1);
        int n2=stoi(v2);
        if (n1>n2) return 1;
        else if (n1<n2) return -1;
    }
    return 0;
}