Simple program big problem

[Ironroot]

Hi all
Ok in class to do we had to do the following and I keep on running into the same problem:

class Array
{
public:
    Array(int size);         //constructor - sets capacity to size
    void print();            //prints the contents of the Array
    void add(int value);     //adds element to end of Array
    ~Array();                //destructor
private:
    int length;                //number of elements
    int capacity;            //size of internal array
    int* list;                //pointer to internal array
    void doubleCapacity();     //doubles the capacity
};
 
int main()
{
    srand(time(NULL));
 
    Array* a2 = new Array(1);
 
    //do the following:
 
    //add 9 elements to a2
    for(int index1 = 0 ; index1 < 10; index1++ )
    {
                 //This is where I hit the problem it jumps from here into add
                //then it runs into trouble
                a2->add(5);
               }
 
    //    print a2
    a2->print();
    //    cleanup
    delete a2;
 
    system("pause");
    return 0;
}
 
Array::Array(int size) : capacity(size), length(0)
{
    int *list = new int[capacity];
}
 
void Array::print()
{
 
    for(int i = 0; i < length; i++)
    {
        cout << list[i] << ", ";
    }
    cout << endl;
 
}
void Array::add(int value)
{
    if(length < capacity)
    {
        list[length] = value;
        length++;
    }
    else
    {
        doubleCapacity();
        list[length] = value;
        length++;
    }
}
Array::~Array()
{
    delete [] list;
    list = NULL;
 
}
void Array::doubleCapacity()
{
 
    int oldcapacity = capacity;
 
    capacity *= 2;
 
    int* temp= new int[capacity];
 
    for(int index = 0; index < oldcapacity; index++)
    {
        temp[index] = list[index];
    }
 
    delete [] list;
    list = temp;
}

/after I jump into a2->add(temp) i get an access violation.
Any help would be great

[svlsr2000]

Hi all
Ok in class to do we had to do the following and I keep on running into the same problem:
class Array
{
public:
Array(int size); //constructor - sets capacity to size
void print(); //prints the contents of the Array
void add(int value); //adds element to end of Array
~Array(); //destructor
private:
int length; //number of elements
int capacity; //size of internal array
int* list; //pointer to internal array
void doubleCapacity(); //doubles the capacity
};

int main()
{
srand(time(NULL));

Array* a2 = new Array(1);

//do the following:

//add 9 elements to a2
for(int index1 = 0 ; index1 < 10; index1++ )
{
//This is where I hit the problem it jumps from here into add
//then it runs into trouble
a2->add(5);
}

// print a2
a2->print();
// cleanup
delete a2;

system("pause");
return 0;
}

Array::Array(int size) : capacity(size), length(0)
{
int *list = new int[capacity];
}

void Array::print()
{

for(int i = 0; i < length; i++)
{
cout << list[i] << ", ";
}
cout << endl;

}
void Array::add(int value)
{
if(length < capacity)
{
list[length] = value;
length++;
}
else
{
doubleCapacity();
list[length] = value;
length++;
}
}
Array::~Array()
{
delete [] list;
list = NULL;

}
void Array::doubleCapacity()
{

int oldcapacity = capacity;

capacity *= 2;

int* temp= new int[capacity];

for(int index = 0; index < oldcapacity; index++)
{
temp[index] = list[index];
}

delete [] list;
list = temp;
}
/after I jump into a2->add(temp) i get an access violation.
Any help would be great

Here the problem is with constructor, its creating a local variable by name list and it initializes it. "ITS NOT INITIALIZING THE LIST IE VARIABLE IN CLASS".