Question

SCREENSHOTS ONLY PLEASE!!! DON'T POST ACTUAL CODE

To gain experience with the dynamic data structures (allocation, automatic expansion, deletion) and the "big three concepts: Destructors, Copy constructors, and Assignment operator. Project Description: You are given two fies mystringiha the document and mystring1.cpp the document which define a String class implemented by using static array as the data member. The purpose of this assignment is to rewrite this class by replacing the static array with a pointer (dynamic array). You are required to modify the String class accordingly: Data: we wish to allow our String class to accommodate strings of different sizes. To that end, instead of storing a string's characters in a fixed-size array, each String object should contain the following data as part of its internal representation (1) a character pointer meant to point to a dynamically-allocated array of characters. (2) a length field that will hold the current length of the string at any given moment Operations: same as the methods in String class, plus the "big three"( destructor, copy constructor, and assignment operator overloading). Modularity: The String class code must be put in its own module, i.e., a file mystring2.h (the header file) should hold the class definition (use conditional compilation directives) and a file mystring2.cpp (the implementation file) should hold the method definitions. Download: mystringDrivercppthe document -A driver program provides a main program to test your new Cl2s5

PLEASE LEAVE A SCREENSHOT ONLY! ACTUAL TEXT IS NOT NEEDED!!!

mystring.h:

//File: mystring1.h

// ================

// Interface file for user-defined String class.

#ifndef _MYSTRING_H

#define _MYSTRING_H

#include<iostream>

#include <cstring> // for strlen(), etc.

using namespace std;

#define MAX_STR_LENGTH 200

class String {

public:

String();

String(const char s[]); // a conversion constructor

void append(const String &str);

// Relational operators

bool operator ==(const String &str) const;

bool operator !=(const String &str) const;

bool operator >(const String &str) const;

bool operator <(const String &str) const;

bool operator >=(const String &str) const;

String operator +=(const String &str);

void print(ostream &out) const;

int length() const;

char operator [](int i) const; // subscript operator

private:

char contents[MAX_STR_LENGTH+1];

int len;

};

ostream & operator<<(ostream &out, const String & r); // overload ostream

operator "<<" - External!

#endif /* not defined _MYSTRING_H */

mystring.cpp:

//File: mystring1.h

// ================

// Interface file for user-defined String class.

#include"mystring1.h”

String::String()

{

contents[0] = '\0';

len = 0;

}

String::String(const char s[])

{

len = strlen(s);

strcpy(contents, s);

}

void String::append(const String &str)

{

strcat(contents, str.contents);

len += str.len;

}

bool String::operator ==(const String &str) const

{

return strcmp(contents, str.contents) == 0;

}

bool String::operator !=(const String &str) const

{

return strcmp(contents, str.contents) != 0;

}

bool String::operator >(const String &str) const

{

return strcmp(contents, str.contents) > 0;

}

bool String::operator <(const String &str) const

{

return strcmp(contents, str.contents) < 0;

}

bool String::operator >=(const String &str) const

{

return strcmp(contents, str.contents) >= 0;

}

String String::operator +=(const String &str)

{

append(str);

return *this;

}

void String::print(ostream &out) const

{

out << contents;

}

int String::length() const

{

return len;

}

char String::operator [](int i) const

{

if (i < 0 || i >= len) {

cerr << "can't access location " << i

<< " of string \"" << contents << "\"" << endl;

return '\0';

}

return contents[i];

}

ostream & operator<<(ostream &out, const String & s) // overload ostream

operator "<<" - External!

{

s.print(out);

return out;

}

mystringDriver.cpp:

#include <iostream>

#include "mystring2.h”

using namespace std;

/************************ Function Prototypes ************************/

/*

* Function: PrintString

* Usage: PrintString(str);

*

* Prints out the value and length of the String object passed to it.

*/

void PrintString(const char *label,

const String &str); // overloaded ostream operator <<

is used in the definition.

/*************************** Main Program **************************/

int main()

{

String str1, str2("init2"), str3 = "init3"; // Some String objects.

Using constructor for copy

char s1[100], s2[100], s3[100]; // Some character strings.

// Print out their initial values...

cout << "Initial values:" << endl;

PrintString("str1", str1);

PrintString("str2", str2);

PrintString("str3", str3);

// Store some values in them...

cout << "\nEnter a value for str1 (no spaces): ";

cin >> s1;

str1 = s1;

cout << "\nEnter a value for str2 (no spaces): ";

cin >> s2;

str2 = s2;

cout << "\nEnter a value for str3 (no spaces): ";

cin >> s3;

str3 = s3;

cout << "\nAfter assignments..." << endl;

PrintString("str1", str1);

PrintString("str2", str2);

PrintString("str3", str3);

// Access some elements...

int i;

cout << "\nEnter which element of str1 to display: ";

cin >> i;

cout << "Element #" << i << " of str1 is '" << str1[i]

<< "'" << endl;

cout << "\nEnter which element of str2 to display: ";

cin >> i;

cout << "Element #" << i << " of str2 is '" << str2[i]

<< "'" << endl;

cout << "\nEnter which element of str3 to display: ";

cin >> i;

cout << "Element #" << i << " of str3 is '" << str3[i]

<< "'" << endl;

// Append some strings...

cout << "\nEnter a value to append to str1 (no spaces): ";

cin >> s1;

// str1.append(s1); // Actually, the cstring is converted to String

object here by the constructor

str1 += s1; // same as above

cout << "\nEnter a value to append to str2 (no spaces): ";

cin >> s2;

str2 += s2;

cout << "\nEnter a value to append to str3 (no spaces): ";

cin >> s3;

str3 += s3;

cout << "\nAfter appending..." << endl;

PrintString("str1", str1);

PrintString("str2", str2);

PrintString("str3", str3);

// Compare some strings...

cout << "\nComparing str1 and str2..." << endl;

cout << "\"";

cout<< str1; // test the overloading of ostream operator <<

cout << "\" is ";

if (str1 < str2) { // test the overloading of comparison operator <

cout << "less than";

} else if (str1 > str2) {

cout << "greater than";

} else {

cout << "equal to";

}

cout << " \"";

cout << str2;

cout << "\"" << endl;

cout << "\ntest the = operator, after str1 = str2; "<< endl;

str1 = str2;

PrintString("str1", str1);

PrintString("str2", str2);

str1 += s1;

cout << "\nAfter str1 = str1 + s1: "<< endl;

PrintString("str1", str1);

PrintString("str2", str2);

String str4(str3);

cout << "\ntest the copy constructor, after str4(str3);"<< endl;

PrintString("str3", str3);

PrintString("str4", str4);

cout << "\nafter appending str3 by str2" << endl;

str3 += str2;

PrintString("str3", str3);

PrintString("str4", str4);

cout<< "\nstr2, str4 are not changed. Type any letter to quit." << endl;

char q;

cin >> q;

return 0;

}

/*********************** Function Definitions **********************/

void PrintString(const char *label,

const String &str)

{

cout << label << " holds \"";

cout << str; // << is overloaded

cout << "\" (length = " << str.length() << ")" << endl;

}

PLEASE ONLY LEAVE A SCREENSHOT OF THE CODE! NO TEXT FILES! OUTPUT AND COMMENTS WOULD BE APPRECIATED AS WELL!

Answer 1

mystring1.h header file

Quick Launch (Ctrl+Q) String Class-Microsoft Visual Studio FILE EDIT VIEW PROJECT BUILD DEBUG TEAM SQL TOOLS TEST ARCHITECTURE ANALYZE WINDOW HELP o つ·ぐ. Local Windows Debugger, Debug , 셰-,ョヤヤ·잇혜 게륙 , ▼ Solution Explorer mystring!.h × (Global Scope) //File: mystring1.h Search Solution Explorer (Ctrl- / Interface file for user-defined String class #ifndef MYSTRINGH Solution String Class' (1 project) String Class #define MYSTRINGH #includec iostream» ー| Header Files bmystring1.h Resource Files · #include <CString» // for strien(), etc using namespace std; #define MAX-STR-LENGTH 200 class String public: String() String(const char s[]) // a conversion constructor void append (const String &str) // Relational operators bool operator (const String &str) const; bool operator-(const String &str) const; bool operator >(const String &str) const; bool operator <(const String &str) const; bool operator-(const String &str) const; string operator +=(const String &str); void print (ostream &out) const; int length() const char operator [(int 1) const; 1/ subscript operator private: char contents[MAX STR_LENGTH+1]; int len; Source Files Solution Explorer Class View Properties ㄗㄨ ostream & operator<< (ostream &out, const String & r); /7 overload ostream operator << External #endif /* not defined MYSTRING H 100 % Error List Output Item(s) Saved Ln 30 Col 37 Ch 37 INS 16:57 O Type here to search 31-05-2019 3

mystring.cpp file

String Class mystring-cpp X String length0 const #include "mystring! "h" //default constructor String: :String() contents側ㄧ ·\θ.;//assing null len _ 0;//as sign len tp θ character //parameterize constructor String: :String(const char s[]) len strlen(s)//assing the length of the char array ofs strcpy (contents, s);//and copy the content of the s to instance varibale contents //method append append the given String object's contnets to callee object'contents 曰void String:: append(const String &str) strcat (contents, str.contents); lenstr.len; /loverloadint operator- that check both string are equals or not bool String::operator -(const String &str) const return strcmp contents, str.contents) -0; /loverloadint operator- that check both string are not equals? bool String::operator !-(const String &str) const return strcmp(contents, str.contents) !.0; Ebool String: ;operator 》(const String &str) const return strcmp(contents, str.contents) θ; 》 bool String::operator <(const String &str) const return strcmp(contents, str.contents) く 0; bool String::operator >-(const String &str) const 100 % ENG 16:58 31-05-2019 3 O Type here to search

String Class mystring-cpp X String length() const return strcmp(contents, str.contents) θ; < bool String::operator -(const String &str) const return strcmp(contents, str.contents) >.0; 曰string string: :operator +-(const string &str) append(str) return this; Eoid String ::print(ostream &out) const out < contents; /freturns the length int String:length) const return len; char String::operator [(int i) const if(i <elli>. len) { cerr << "can't access location <<i くく " of string \"" << contents << "\"" << endl; return 'e return contents[i] 曰ostream & operator<<(ostream &out, const String & s) // overload ostreamoperator "<<" External! s-print (out); return out; 100% 16:58 O Type here to search 31-05-2019 3

mysstringDriver.cpp

String Class Global Scope main #include <iostream #include "mystring!,h using namespace std; Function: PrintString Usage: PrintString(str) Prints out the value and length of the String object passed to it void PrintString(const char label,const String &str); I/ overloaded ostream operator <<is used in the definition /****Main Program int main() String str1, str2( init2"), str3 init3" II Some String objects.Using constructor for copy char s1[1], s2[100], s3[180]; I Some character strings /I Print out their initial values... cout < "Initial values:" <<endl; PrintString("str1", str1) PrintString("str2", str2) PrintString("str3", str3) /I Store some values in them cout<"nEnter a value for str1 (no spaces):; cin >>s1; str1 s1; cout<"nEnter a value for str2 (no spaces):; cin >>s2; str2 s2; cout<"nEnter a value for str3 (no spaces):; cin >>s3; str3 s3; cout<"nAfter assignments..."<< endl; PrintString("str1", str1) PrintString("str2", str2) PrintString("str3", str3); Access some elements. int i cout<"LnEnter which element of strl to display in >> i; cout << "Element #. << ǐ << " of stri is .. << str1[i]<< " << endl; 100% O Type here to search 31-05-2019 3

String Class Global Scope main PrintStr ing( "str3", str3); Access some elements. int i cout<"LnEnter which element of strl to display in >> i; cout << "Element #. << ǐ << " of str1 is .. << str1[i]<< " << endl; cout<"nEnter which element of str2 to display: "; cin >> i; cout << "Element #. << ī << " of str2 is .. << str2[i]<< " << endl; cout<"nEnter which element of str3 to display: "; cin >> i; cout << "Element #. << ī << " of str3 is .. << str3[i]<< " << endl; Append some strings cout<"nEnter a value to append to strl (no spaces): "; cin >>s1; /I stri.append (s1) Actually, the cstring is converted to Stringobject here by the constructor stri s1; I same as above cout<"nEnter a value to append to str2 (no spaces): "; cin >>s2; str2s2; cout<"nEnter a value to append to str3 (no spaces): "; cin >>s3; str3s3; cout<"nAfter appending..." << endl; PrintString("str1", str1) PrintString("str2", str2) PrintString("str3", str3) /I Compare some strings cout<"nComparing strl and str2..." << endl; cout <<" cout<< strl; I/ test the overloading of ostream operator << cout<"\ is "; if (stri < str2) { // test the overloading of comparison operatorく cout<"less than else if (strl str2) cout <<"greater than" 100 % 17:02 O Type here to search 31-05-2019 3

String Class Global Scope main else if (stri>str2) cout <<"greater than" cout<"equal to" cout <<" cout<str2; cout<<<endl; cout<"Intest the -operator, after stri - str2; "< endl tr1 str2; PrintString("strl", strl); PrintString("str2", str2) str1s1; cout << "InAfter str1- str1+s1: "<endl; PrintString("strl", strl); PrintString("str2", str2) String str4(str3) cout < "Intest the copy constructor, after str4(str3):*< endl PrintString("str3", str3) PrintString("str4", str4) cout nafter appending str3 by str2" <endl; str3str2; PrintString("str3", str3) PrintString("str4", str4) cout<s "Instr2, str4 are not changed. Type any letter to quit.-<endl char q return e; Function Definitions Evoid PrintString(const char labe1,const String 8str) cout<label <<" holds cout <<str I<< is overloaded cout <<"\" (length-. << str. length() << )" << endl; 100% rP ^偏ョ40 ENG 31-05-2019号 O Type here to search

String Class Global Scope main PrintString("str2", str2) strls1; cout<"nAfter str1-str1+s1: "<<endl; PrintString("str1", str1) PrintString("str2", str2) String str4(str3) cout << "ntest the r, after str4(str3)"<<endl; PrintString("str3", str3) PrintString("str4", str4) cout<"Lnafter appending str3 by str2" <endl; str3str2; PrintString("str3", str3) PrintString("str4", str4) cout< "nstr2, str4 are not changed. Type any letter to quit. << endl; char q cin >> q; return e; avoid PrintString(const char *label,const String &str) cout くく label << " holds \""; cout <<str I<< is overloaded cout<"(ength << str.length) < ")" << endl; 100% 17:02 O Type here to search 31-05-2019 3

output

Initial values: str1 holds(length e) str2 holds "init2" (length 5) str3 holds "init3" (length 5) Enter a value for str1 (no spaces): Computer Enter a value for str2 (no spaces): Science Enter a value for str3 (no spaces): C++ After assignments... str1 holds "Computer" (length8) str2 holds "Science" (length 7) str3 holds "C++ (length 3) Enter which element of str1 to display: 3 Element #3 of stri is .p Enter which element of str2 to display: 4 Element #4 of str2 is "n. Enter which element of str3 to display: 2 Element #2 of str3 is 4. Enter a value to append to stri (no spaces): Programming Enter a value to append to str2 (no spaces): &Technology Enter a value to append to str3 (no spaces): 00P After appending... str1 holds "ComputerProgramming" (length 19) str2 holds -Science&Technology" (length 18) str3 holds "C++0OP" (length 6) Comparing stri and str2... ComputerProgramming" is less than "Science&Technology test the operator, after stri str2; str1 holds "Science&Technology" (length 18) str2 holds -Science&Technology" (length 18) After str1 str1 + s1: 16:51 O Type here to search 31-05-2019 3

Enter a value to append to str1 (no spaces): Programming Enter a value to append to str2 (no spaces): &Technology Enter a value to append to str3 (no spaces): 00P After appending... str1 holds "ComputerProgramming" (length 19) str2 holds "Science&Technology" (length -18) str3 holds "C++0OP" (length 6) Comparing stri and str2... ComputerProgramming" is less than "Science&Technology test the operator, after stri str2; str1 holds "Science&Technology" (length 18) str2 holds "Science&Technology" (length -18) After str1-str1+s1: stri holds "Science&TechnologyProgramming" (length 29) str2 holds "Science&Technology" (length -18) test the copy constructor, after str4(str3); str3 holds "C++00P (length 6) str4 holds "C++00P (length 6) after appending str3 by str2 str3 holds "C++0OPScience&Technology (length - 24) str4 holds -C++00P" (length = 6) str2, str4 are not changed. Type any letter to quit Press any key to continue ENG 16:52 31-05-2019 3 O Type here to search

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