class String 
{ 
public: String(const char *str = NULL); // 鏅氭瀯閫犲嚱鏁?nbsp; String(const String &other); // 鎷瘋礉鏋勯犲嚱鏁?nbsp; ~ String(void); // 鏋愭瀯鍑芥暟 String & operate =(const String &other); // 璧嬪煎嚱鏁?nbsp;private: char *m_data; // 鐢ㄤ簬淇濆瓨瀛楃涓?nbsp;
}; // String 鐨勬瀽鏋勫嚱鏁?nbsp;String::~String(void) { delete [] m_data;// 鐢變簬m_data 鏄唴閮ㄦ暟鎹被鍨?涔熷彲浠ュ啓鎴恉elete m_data; } // String 鐨勬櫘閫氭瀯閫犲嚱鏁?nbsp;String::String(const char *str) { if(str==NULL) 
{ m_data = new char[1]; // 鑻ヨ兘鍔燦ULL 鍒ゆ柇鍒欐洿濂?nbsp; *m_data = '\0'; 
} else { int length = strlen(str); m_data = new char[length+1]; // 鑻ヨ兘鍔燦ULL 鍒ゆ柇鍒欐洿濂?nbsp; strcpy(m_data, str); } } // 鎷瘋礉鏋勯犲嚱鏁?nbsp;String::String(const String &other) { int length = strlen(other.m_data); m_data = new char[length+1]; // 鑻ヨ兘鍔燦ULL 鍒ゆ柇鍒欐洿濂?nbsp; strcpy(m_data, other.m_data); } // 璧嬪煎嚱鏁?nbsp;String & String::operate =(const String &other) { // (1) 媯鏌ヨ嚜璧嬪?nbsp; if(this == &other) return *this; // (2) 閲婃斁鍘熸湁鐨勫唴瀛樿祫婧?nbsp; delete [] m_data; // (3)鍒嗛厤鏂扮殑鍐呭瓨璧勬簮,騫跺鍒跺唴瀹?nbsp; int length = strlen(other.m_data); m_data = new char[length+1]; // 鑻ヨ兘鍔燦ULL 鍒ゆ柇鍒欐洿濂?nbsp; strcpy(m_data, other.m_data); // (4)榪斿洖鏈璞＄殑寮曠敤 return *this; }
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