Write a string class. To avoid conflicts with other similarly named classes, we will call our version MyString. This object is designed to make working with sequences of characters a little more convenient and less error-prone than handling raw c-strings, (although it will be implemented as a c-string behind the scenes). The MyString class will handle constructing strings, reading/printing, and accessing characters. In addition, the MyString object will have the ability to make a full deep-copy of itself when copied. Your class must have only one data member, a c-string implemented as a dynamic array. In particular, you must not use a data member to keep track of the size or length of the MyString. #include "mystring.h" #include        #include #include using namespace std; using namespace cs_mystring;   void BasicTest(); void RelationTest(); void CopyTest(); MyString AppendTest(const MyString& ref, MyString val); string boolString(bool convertMe);   int main() {     BasicTest();     RelationTest();     CopyTest(); } void BasicTest() {     MyString s;     cout << "----- Testing basic String creation & printing" << endl;          const MyString strs[] =                  {MyString("Wow"), MyString("C++ is neat!"),                  MyString(""), MyString("a-z")};                               for (int i = 0; i < 4; i++){         cout << "string [" << i <<"] = " << strs[i] << endl;     }       cout << endl << "----- Testing access to characters (using const)" << endl;     const MyString s1("abcdefghijklmnopqsrtuvwxyz");     cout <<  "Whole string is " << s1 << endl;     cout << "now char by char: ";     for (int i = 0; i < s1.length(); i++){         cout << s1[i];     }       cout << endl << "----- Testing access to characters (using non-const)" << endl;     MyString s2("abcdefghijklmnopqsrtuvwxyz");     cout <<  "Start with " << s2;     for (int i = 0; i < s2.length(); i++){         s2[i] = toupper(s2[i]);     }     cout << " and convert to " << s2 << endl; } string boolString(bool convertMe) {     if (convertMe) {         return "true";     } else {         return "false";     } } void RelationTest() {     cout << "\n----- Testing relational operators between MyStrings\n";       const MyString strs[] =          {MyString("app"), MyString("apple"), MyString(""),          MyString("Banana"), MyString("Banana")};       for (int i = 0; i < 4; i++) {         cout << "Comparing " << strs[i] << " to " << strs[i+1] << endl;         cout << "    Is left < right? " << boolString(strs[i] < strs[i+1]) << endl;         cout << "    Is left <= right? " << boolString(strs[i] <= strs[i+1]) << endl;         cout << "    Is left > right? " << boolString(strs[i] > strs[i+1]) << endl;         cout << "    Is left >= right? " << boolString(strs[i] >= strs[i+1]) << endl;         cout << "    Does left == right? " << boolString(strs[i] == strs[i+1]) << endl;         cout << "    Does left != right ? " << boolString(strs[i] != strs[i+1]) << endl;     }       cout << "\n----- Testing relations between MyStrings and char *\n";     MyString s("he");     const char *t = "hello";     cout << "Comparing " << s << " to " << t << endl;     cout << "    Is left < right? " << boolString(s < t) << endl;     cout << "    Is left <= right? " << boolString(s <= t) << endl;     cout << "    Is left > right? " << boolString(s > t) << endl;     cout << "    Is left >= right? " << boolString(s >= t) << endl;     cout << "    Does left == right? " << boolString(s == t) << endl;     cout << "    Does left != right ? " << boolString(s != t) << endl;          MyString u("wackity");     const char *v = "why";     cout << "Comparing " << v << " to " << u << endl;     cout << "    Is left < right? " << boolString(v < u) << endl;     cout << "    Is left <= right? " << boolString(v <= u) << endl;     cout << "    Is left > right? " << boolString(v > u) << endl;     cout << "    Is left >= right? " << boolString(v >= u) << endl;     cout << "    Does left == right? " << boolString(v == u) << endl;     cout << "    Does left != right ? " << boolString(v != u) << endl;   } MyString AppendTest(const MyString& ref, MyString val) {     val[0] = 'B';     return val; } void CopyTest() {     cout << "\n----- Testing copy constructor and operator= on MyStrings\n";       MyString orig("cake");          MyString copy(orig);    // invoke copy constructor       copy[0] = 'f';  // change first letter of the *copy*     cout << "original is " << orig << ", copy is " << copy << endl;          MyString copy2;                copy2 = orig;            copy2[0] = 'f';           cout << "original is " << orig << ", copy is " << copy2 << endl;          copy2 = "Copy Cat";     copy2 = copy2;             cout << "after self assignment, copy is " << copy2 << endl;          cout << "Testing pass & return MyStrings by value and ref" << endl;     MyString val = "winky";     MyString sum = AppendTest("Boo", val);     cout << "after calling Append, sum is " << sum << endl;     cout << "val is " << val << endl;     val = sum;     cout << "after assign,  val is " << val << endl; }