锘??xml version="1.0" encoding="utf-8" standalone="yes"?>
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;
}
]]>