Answered: Implement the copy constructor for the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Implement the copy constructor for the StringVar class using the options given on the right side window. Place the code into the left side using the arrows. NOTE: Be careful! There are decoys!

Assume that StringVar.h has the following declaration:

#include <iostream>

class StringVar {
public:
StringVar() : max_length(20) { // Default constructor size is 20
value = new char[max_length+1];
value[0] = '\0';
}

StringVar(int size); // Takes an int for size

StringVar(const char cstr[]); // Takes a c-string and copies it

StringVar(const StringVar& strObj); // Copy Constructor

~StringVar(); // Destructor

int size() const { return max_length; } // Access capacity

const char* c_str() const { return value; } // Access value

int length() const { return strlen(value); } // Access length

StringVar& operator= (const StringVar& rightObj);

std::istream& operator>> (std::istream& in, StringVar& strVar);

std::ostream& operator<< (std::ostream& out, const StringVar& strVar);

private:
int max_length;
char* value;
};

Organize blocks of code:

O Exit Full Screen
RESPONSE AREA
ANSWER BANK
Organize answer blocks in the proper order:
Move the necessary blocks over into the response area:
strcpy(strVar.value, value);
# #include "StringVar.h"
4
: size(strVar.size())
value = new char[strVar.length()+1];
# #include <cstring>
: max_length(strVar.length())
strcpy(value, strVar.c_str());
int max_length;
char value[strVar.max_length];
: StringVar::StringVar(const StringVar& strVar)

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