Dynamic array class won't print - c

Question

#include <iostream>
#include <cmath>
#include <iomanip>
#include <cstring>
#include <cstddef>
class ArrayList
{
public:
ArrayList();
void expand();
void store(std::string x);
void display_size();
friend std::ostream& operator<<(std::ostream& os, const ArrayList &arr);
void clean();
ArrayList(const ArrayList &arr);
~ArrayList();
void operator=(const ArrayList& arr);
private:
int size; //total size of your dynamic array
int max; //double the size of the array.
int free_space; //total size of unused space in your dynamic array
char *array; //a pointer used to create a dynamic array
};
ArrayList::ArrayList()
{
size = 2;
free_space = 1;
array = new char[2]();
array[0] = ' ';
array[1] = '\0';
max = size;
}
void ArrayList::expand()
{
max = size + size;
char *temp = new char[max];
for( int i = 0; i < max; i++ )
{
array[i] = temp[i];
}
free_space = free_space + size;
delete [] array;
array = temp;
size = max;
}
void ArrayList::store(std::string x)
{
int taken = max - free_space;
int y = x.size();
free_space = free_space - y;
for(int i = 0; i < y; i++)
{
if(y >= size)
{
while(y >= size)
{
expand();
}
}
else
{
array[i + taken] = x[i];
}
}
}
std::ostream& operator<<(std::ostream& os, const ArrayList &arr)
{
os << arr.array;
return os;
}
void ArrayList::display_size()
{
size = max;
std::cout << "Array Content: ";
std::cout << array;
std::cout << std::endl;
std::cout << "Remaining size: ";
std::cout << free_space;
std::cout << std::endl;
}
void ArrayList::clean()
{
int x = 0;
for(int i = 0; i < size; i++)
{
if(array[i] == ' ')
{
x++;
}
}
size = x;
}
ArrayList::ArrayList(const ArrayList &arr)
{
array = new char[size + 1];
strcpy(array, arr.array);
}
ArrayList::~ArrayList()
{
delete [] array;
}
void ArrayList::operator=(const ArrayList& arr)
{
int new_length = strlen(arr.array);
if(new_length > max)
{
delete [] array;
max = new_length;
array = new char[max + 1];
}
for(int i = 0; i < new_length; i++)
{
array[i] = arr.array[i];
}
array[new_length] = '\0';
}
int main()
{
ArrayList x;
std::string y;
char ans;
x.display_size();
std::cout << "Please enter your string: ";
std::cin >> y;
x.store(y);
x.display_size();// << std::endl;
do
{
std::cout << "Please enter your string: ";
std::cin >> y;
x.store(y);
x.display_size();
std::cout << "Do you want to enter another string? (y/n) ";
std::cin >> ans;
}while(ans != 'n');
return 0;
}
My question is regarding C++ dynamic arrays. I've created a class which creates a dynamic array.
I've posted my entire code it should be runnable.
The issue stems from the use of the store and expand functions.
store takes a string and puts each character into the array, if there isn't enough space it calls expand.
expand doubles the size of the array.
Array Content:
Remaining size: 1
Please enter your string: h
Array Content: h
Remaining size: 0
Please enter your string: ello
Array Content:
Remaining size: 2
Do you want to enter another string? (y/n) n
In theory the output above should have returned "hello" however it hasn't returned anything, despite returning the 'h' earlier. I'm completely out of ideas on how to solve this.
EDIT:
I've since changed the functions according to the advice given to me:
void ArrayList::expand()
{
max = size + size;
char *temp = new char[max];
for( int i = 0; i < max; i++ )
{
temp[i] = array[i];
}
free_space = free_space + size;
delete [] array;
array = temp;
size = max;
}
void ArrayList::store(std::string x)
{
int taken = max - free_space;
int y = x.size();
free_space = free_space - y;
for(int i = 0; i < y; i++)
{
if(free_space <= 0)
{
while(free_space <= 0)
{
expand();
}
}
else
{
array[i+taken] = x[i]; //I'm cetain this didn't do anything
}
}
}
I've solved the negative number issue detailed in the comments. The only issue now is printing the number.

Answer 1

This "for" loop in "expand" method:
for( int i = 0; i < max; i++ )
{
array[i] = temp[i];
}
should be replaced by:
for( int i = 0; i < size; i++ )
{
temp[i] = array[i];
}