Linked List Beginner

[sobrio35]

Day 1 learning about linked lists. I am following an example in the textbook, and the following code compiles fine. When I go to run, however it forces the .exe file to close. Is it a code issue or am I missing a file? Using Dev c++ 5.4 right now.

#include<iostream>
#include<string>
#include<iomanip>
#include<stdio.h>
#include<conio.h>
#include<list>
using namespace std;

int main()
{
struct nodeType
{
	int info;
	nodeType *link;
};
nodeType *head, *p, *q, *newNode;
newNode = new nodeType;
newNode->info = 50;
newNode->link = p->link;
p->link = newNode;
} 

[kevinkjt2000]

Your program produces no output and receives no input. So it should just run to completion rather quickly and show you nothing as a result. Unless, by saying

forces the .exe file to close

you mean that there is an error of some sort that comes up letting you know the program had an abnormal termination.

[sobrio35]

Yes, the exact error reads "File_Name".exe has stopped working:
A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available.

However, since it compiles with no errors or warning I thought maybe I was missing a dev c++ file. The error only occurs when I run.

[MiiNiPaa]

newNode->link = p->link;

Tell me, where does p points to? And what will we get if we will try to get some value from it?

[kevinkjt2000]

Actually your program accesses unknown memory on line 19.
p does not have a memory address assigned to it, but you are trying to access UNKOWN->link so it crashes.

[sobrio35]

This is even simpler. I expected to be able to start storing numbers in head->info after the pointer *head was defined. However the code below gives the same error. It's likely I just don't understand how the linked lists work yet. Again, this compiles but doesn't run. Is there something else I need to initialize?

#include<iostream>
#include<string>
#include<iomanip>
#include<stdio.h>
#include<conio.h>
#include<list>
using namespace std;

int main()
{
struct nodeType
{
	int info;
	nodeType *link;
};
nodeType *head;
head->info = 50;
cout << head->info;
}

[MiiNiPaa]

It's likely I just don't understand how the linked lists work yet.

You don't understand how pointers work yet. I suggest starting with learning pointers purpose and usage:

http://www.cplusplus.com/doc/tutorial/pointers/
http://www.learncpp.com/cpp-tutorial/67-introduction-to-pointers/

[sobrio35]

I will do that. Thanks.