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初始化：

char ch_music[] = {
   "Roly-Poly"};    string str1 = "yesterday once more";    string str2 ("my heart go on");    string str3 (str1,6);           // = day once more    string str4 (str1,6,3);        // = day    string str5 = ch_music;   // = Roly-Poly     string str6 (ch_music);    // = Roly-Poly    string str7 (ch_music,4); // = Roly    string str8 (10,'i');           // = iiiiiiii    string str9 (ch_music+5, ch_music+9); // = Poly

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