7.10. Exercises

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1. What would happen if we compiled the program in Figure 7.19? Why?

FIGURE 7.19. Exercise 1 (code\strex1.cpp)

class string

{

public:

string();

string(const string& Str);

string(char* p);

string& operator = (const string& Str);

~string();

private:

short m_Length;

char* m_Data;

};

int main()

{

string s;

string n("Test");

string x;

short Length;

Length = n.m_Length;

s = n;

n = "My name is Susan";

x = n;

return 0;

}

2. What would happen if we compiled the program in Figure 7.20? Why?

FIGURE 7.20. Exercise 2 (code\strex2.cpp)

class string

{

public:

string(const string& Str);

string(char* p);

string& operator=(const string& Str);

~string();

private:

string();

short m_Length;

char* m_Data;

};

int main()

{

string s("Test");

string n;

n = s;

return 0;

}

3. What would happen if we compiled the program in Figure 7.21? Why?

FIGURE 7.21. Exercise 3 (code\strex3.cpp)

class string

{

public:

string();

string(const string& Str);

string(char* p);

string& operator=(const string& Str);

private:

~string();

short m_Length;

char* m_Data;

};

int main()

{

string s("Test");

return 0;

}

4. What would happen if a user of our string class wrote an expression that tried to set a string variable to itself (e.g., a = a;)?