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# Can someone with more coding experience, try re-wording this so I understand it better, dumb it down.

Posted on 2008-06-15
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Write a program that creates a linked list of points. For this assignment we define a point as a set of integers, X and Y. This linked list should insert the points ordered by the x value. The user is prompted to enter as many points as they desire. Each point is a new node in the linked list. After the user has entered all the points they wish to enter, the program is to output the linked list data (i.e. X and Y integers) as it appears in the linked list.
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Question by:jschmuff
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LVL 53

Expert Comment

ID: 21789876
Which part is it that you don't understand ? Linked lists are a common data structure, consisting of nodes linked together by pointers. Take a look at this wiki for a very good overview :

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Author Comment

ID: 21789887
Ok ill ask a few questions here:
I need to take in two different int and create a different one to ask the user how many he will input? or will I take x and the value of the int and y will be the amount the user wants to input?

I am really confused on what is wanted here. If someone can dumb this down for me that would be great I have a text book here with the linked list problem there are no real examples in it that show output. So I am confused on the whole matter.
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LVL 53

Accepted Solution

Infinity08 earned 500 total points
ID: 21789920
A point is a combination of two values : x and y. These two values represent the X and Y coordinates of the point. You'll have to create a struct called Point that contains an x and y value.

Then you'll have to create a linked list that holds these Point structs as elements. See the wiki I posted earlier to get a better idea of what a linked list is, how it works, and how to implement it properly.

Finally, you'll have to have an input loop, asking the user in each iteration to enter a new point (two values, x and y). This point is then added to the linked list (ordered by the x value).

When the user decides that he has entered enough points, you simply iterate through the linked list, and show all points in it.
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LVL 19

Expert Comment

ID: 21789930
The assignment does not specify how to identify the number of points the user wishes to enter so this part is up to you, you can for example ask the user how many points they wish to create as the first question and then loop that many times collecting the integer pairs that compose a point or you can have a loop that will go on until the user hits enter without having specified the 2 integers, so it would be e.g.:

while the read input is not the just the "Enter" key
construct a new point out of the 2 integers
insert the new point object as a node into the linked list in ascending order
end while
loop through the linked list and display the values
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Author Comment

ID: 21789977
So kind of like this then except I need to now display them?

``````#include <iostream>

using namespace std;

int main()
{
struct Point
{
int x;
int y;
Point *next;
};

int count = 0;
int Xx;
int Yy;

cout << "How many integers to enter for each x and y: ";
cin >> count;
cout << endl;

for (int i = 0; i < count; i++)
{
cout << "Enter int X: ";
cin >> Xx;
cout << endl;
cout << "Enter int Y: ";
cin >> Yy;
cout << endl;

Point *temp1 = new Point;
temp1->x = Xx;

Point *temp2 = new Point;
temp2->y = Yy;

}
}
``````
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LVL 19

Expert Comment

ID: 21790017
You do not need to construct temp2, assign the Xx and Yy to x and y of temp1 respectively. Also one of your requirements is to insert the point into the linked list in ascending order by value of x, currently you are just adding the new point to the beginning of the list when instead you have to traverse the list check the value of x of each node in the list and then insert the new point at the appropriate place so the items are in order.
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LVL 53

Expert Comment

ID: 21790911
what LordOfPorts said ^ ;)
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