入门经典第五章例题5-3

利用stringstream进行分词，把输入的字符串标准化后构建stringstream，以cin的方法从字符串流中读出来再添加到字典中。

using namespace std;
set<string> dict;
int main() {
    string s, buf;
    while (cin >> s) {
        for (int i = 0, len = s.length(); i < len; ++i) {
            if (isalpha(s[i])) s[i] = tolower(s[i]);
            else s[i] = ' ';
        }
        stringstream ss(s);
        while (ss >> buf) dict.insert(buf);
    }
    for (set<string>::iterator it = dict.begin(); it != dict.end(); ++it) 
        cout << *it << endl;
    return 0;
}

转载于:https://www.cnblogs.com/jeffy-chang/p/7245280.html