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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

DO ALL THIS IN THE CODE PROVIDED BELOW

- Add destructor

- Add copy constructor

- Overload the assignment operator

- Overload the << operator to display set

- Add elements in sorted way

- Make search (logn)

#include <iostream>
#include<set>
using namespace std;

class Set{
private:
int* arr;
int count=0;
int capacity=10;
public:
Set(){
arr = new int[capacity];
};
void add(int);
bool search(int);
Set union_set(const Set& set2);
void display();

};

int main(){
Set set1;
Set set2;
set1.add(5); set1.add(3); set1.add(2); set1.add(4);
set2.add(7); set2.add(3); set2.add(8); set2.add(9);
Set set3 = set1+ set2;
cout << set3;

//example of the set use from the std library. Set implemented using BST

set<int> myset;
set<int>::iterator it; // pointer to a node

// set some initial values:

myset.insert(30);
myset.insert(70);
myset.insert(90);
myset.insert(20);
myset.insert(10);
//it = myset.find(20);
//myset.erase(it);
//myset.erase(myset.find(40));

std::cout << "myset contains:";
for (it = myset.begin(); it != myset.end(); ++it)
std::cout << ' ' << *it;
std::cout << '\n';

return 0;
}
void Set::add(int data){

if (count >= capacity){
//expend set
}

if (!search(data)){

//Futute improvement: insert sorted - lots of shifting, so BST is more efficient
arr[count++] = data;
}

}
bool Set::search(int data){

//Futute improvement: binary search but has to be sorted
for (int i = 0; i < count; i++){
if (arr[i] == data)
return true;
}
return false;
}
Set Set::union_set(const Set& set2){
Set newSet;
for (int i = 0; i < count; i++)
newSet.add(arr[i]);
for (int i = 0; i < set2.count; i++){
newSet.add(set2.arr[i]);
}
return newSet;
}

void Set::display(){
for (int i = 0; i < count; i++)
{
cout << arr[i] << ' ';
}
cout << endl;
}

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