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Requirements:
Write a string class, construct, copy, assign values, deconstruct, and so on.

Class string

{

Public:

String (const char * STR = NULL); // common Constructor

String (const string & other); // copy the constructor

~ String (void); // destructor

String & operate = (const string & other); // value assignment function

PRIVATE:

Char * m_data; // used to save strings

};

// String Constructor

String: string (const char * Str)

{

If (STR = NULL)

{

M_data = new char [1];

* M_data = '\ 0 ';

}
 
Else

{

Int length = strlen (STR );

M_data = new char [Length + 1];

Strcpy (m_data, STR );

}

}

// String destructor

String ::~ String (void)

{

Delete [] m_data;

// Because m_data is an internal data type, it can also be written as delete m_data;

}
// Copy the constructor

String: string (const string & other)

{

// Allow the operation of the private member m_data of other

Int length = strlen (other. m_data );

M_data = new char [Length + 1];

Strcpy (m_data, other. m_data );

}

// Value assignment function

String & string: operate = (const string & other)

{

// (1) Check the auto-assigned Value

If (this = & other)

Return * this;

// (2) release the original memory resource

Delete [] m_data;

// (3) allocate new memory resources and copy the content

Int length = strlen (other. m_data );

M_data = new char [Length + 1];

Strcpy (m_data, other. m_data );

// (4) return the reference of this object

Return * This; // remember at valid tive C ++, always return refrence of this.

}