Help writing Functions

boat_58's Avatar, Join Date: Mar 2011
Light Poster
can someone please help me write these functions, i have looked online and i am having trouble finding how to write them. Thanks

class List
{

private:
int *a;
int count;
int capacity;


public:
List(); // create an empty list with capacity 0
List(int n); // create a list with capacity n
List(List l); // create a list similar to passed object l
~List(); // de-allocates memory from the list
void AddElement(int v); //add a number at the end of the list
void AddElement(int v,int p); // insert a number v at position p
void Sort(); // sorts all the numbers in the list
int *Retrieve(); // returns the pointer of a
List operator++(); // increate all the numbers in the list by 1
List operator--(); // decrease all the numbers in the list by 1
List operator+(int n); // increase all the numbers in the list by n
List operator-(int n); // decrease all the numbers in the list by n
List operator=(List l); // creates a duplicate list of l
friend List Combine(List l1,List l2); // creates and returns a new list, merging L1 and L2, so that the numbers in new list is sorted
}


------------------------------------------------------------------------------

List :: List()
{


}
List :: List(int n)
{


}

List :: List(List l)
{


}

List :: ~List()
{


}

void List :: AddElement(int v)
{


}

void List :: AddElement(int v,int p)
{


}

void List :: Sort()
{


}

int *Retrieve()
{


}

List List :: operator++()
{


}

List List :: operator--()
{


}

List List :: operator+(int n)
{


}

List List :: operator-(int n)
{


}

List List :: operator=(List l)
{


}

List Combine(List l1,List l2)
{


}
0
xpi0t0s's Avatar, Join Date: Aug 2004
Mentor
Just take them one at a time. What do you think a, count and capacity should be set to for an empty list? (At least have a guess)
0
boat_58's Avatar, Join Date: Mar 2011
Light Poster
i think i got some of it down but i am not sure if its right. for the first few i got this so far.

PHP Code:
List :: List()
{
=0;
count =0;
Capacity=0;

}

List :: List(
int n)
{
a=new int[n];
count n;
Capacity =n;

}

List :: List(List 
l// This one i am not sure because i could not see any example on a passed object
{
a= new int[l]
count =l;
Capacity l;

}

List :: ~List()
{
delete a;
count=0;
Capacity=0;


Thats what i have gotten so far. I am having trouble with the two AddElements ones, can you help me on those ones, i will post what i have for sort and retrieve after i try for them.

Thanks
0
xpi0t0s's Avatar, Join Date: Aug 2004
Mentor
Your copy constructor is not correct; l is a List, not an integer. Use l.count and l.Capacity instead.

Where are you stuck on the AddElements ones? For this, you would just need to identify the next free slot in the array, copy the value and increase count, having checked of course that Capacity has not been exceeded, correct?