Answered: ase debug this code and the correct…

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

Please debug this code and the correct output is shown in the image below

#include <iostream>
#include <sstream>
#include <algorithm>

// primary data members:
template <typename T>
class dynamic_array
{
T* data;
size_t n;

public:
dynamic_array(int n)
{
this->n = n;
data = new T[n];
}
dynamic_array(const dynamic_array<T>& other)
{
n = other.n;
data = new T[n];
for(int i = 0; i < n; i++)
data[i] = other[i];
}

T& operator[](int index)
{
return data[index];
}
const T& operator[](int index) const
{
return data[index];
}
T& at(int index)
{
if(index < n)
return data[index];
throw "Index out of range";
}

size_t size() const
{
return n;
}

//
// dynamic_array:
T* begin()
{
return data;
}
const T* begin() const
{
return data;

}
T* end()
{
return data + n;
}
const T* end() const
{
return data + n;
}

friend dynamic_array<T> operator+(const dynamic_array<T>& arr1, dynamic_array<T>& arr2){
dynamic_array<T> result(arr1.size() + arr2.size());
std::copy(arr1.begin(), arr1.end(), result.begin());
std::copy(arr2.begin(), arr2.end(), result.begin() + arr1.size());
return result;
}

std::string to_string(const std::string& sep = ", ")
{
if(n == 0)
return "";
std::ostringstream os;
os << data[0];
for(int i = 1; i < n; i++)
os << sep << data[i];
return os.str();
}
};

// add operator<< to print it properly:
struct student
{
std::string name;
int standard;
};
std::ostream& operator<<(std::ostream& os, const student& s)
{
return (os << "[Name: " << s.name << ", Standard: " << s.standard <<
"]");
}

int main()
{
int nStudents;
std::cout << "Enter number of students in class 1: ";
std::cin >> nStudents;
dynamic_array<student> class1(nStudents);
for(int i = 0; i < nStudents; i++)
{
std::cout << "Enter name and class of student " << i + 1 << ": ";
std::string name;
int standard;
std::cin >> name >> standard;
class1[i] = student{name, standard};
}
// Now, let's try to access the student out of range in the array
try
{
class1[nStudents] = student{"John", 8}; // No exception, undefined
// behavior
std::cout << "class1 student set out of range without exception" <<
std::endl;
class1.at(nStudents) = student{"John", 8}; // Will throw exception
}
catch(...)
{
std::cout << "Exception caught" << std::endl;
}
auto class2 = class1; // Deep copy
std::cout << "Second class after initialized using first array: " <<
class2.to_string() << std::endl;
auto class3 = class1 + class2;
// Combines both classes and creates a bigger one
std::cout << "Combined class: ";
std::cout << class3.to_string() << std::endl;
return 0;
}