## Thursday, May 24, 2007

### How do you find the middle of a linked list? Write a C program to return the middle of a linked list

Here are a few C program snippets to give you an idea of the possible solutions.

Method1 (Uses one slow pointer and one fast pointer)

#include
#include

typedef struct node
{
int value;
struct node *next;
struct node *prev;
}mynode ;

void print_list(char *listName, struct node *head);

// The main function..
int main()
{

getch();
return(0);
}

// This function uses one slow and one fast
// pointer to get to the middle of the LL.
//
// The slow pointer is advanced only by one node
// and the fast pointer is advanced by two nodes!

{

if(q!=NULL)
{
while((q->next)!=NULL && (q->next->next)!=NULL)
{
p=(p!=(mynode *)NULL?p->next:(mynode *)NULL);
q=(q!=(mynode *)NULL?q->next:(mynode *)NULL);
q=(q!=(mynode *)NULL?q->next:(mynode *)NULL);
}
printf("The middle element is [%d]",p->value);
}
}

// Function to add a node
{
mynode *temp, *cur;
temp = (mynode *)malloc(sizeof(mynode));
temp->next=NULL;
temp->prev=NULL;

{
temp->value=value;
}
else
{
cur->next=temp;
temp->prev=cur;
temp->value=value;
}
}

// Function to print the linked list...
void print_list(char *listName, struct node *head)
{
mynode *temp;

printf("\n[%s] -> ", listName);
{
printf("[%d]->",temp->value);
}

printf("NULL\n");

}

Here p moves one step, where as q moves two steps, when q reaches end, p will be at the middle of the linked list.

Method2(Uses a counter)

#include
#include

typedef struct node
{
int value;
struct node *next;
struct node *prev;
}mynode ;

void print_list(char *listName, struct node *head);

// The main function..
int main()
{

printf("\nMiddle node -> [%d]\n\n", middle->value);

getch();
return(0);
}

// Function to get to the middle of the LL
{
mynode *middle = (mynode *)NULL;
int i;

{
if(i==1)
else if ((i%2)==1)
middle=middle->next;
}

return middle;
}

// Function to add a new node to the LL
{
mynode *temp, *cur;
temp = (mynode *)malloc(sizeof(mynode));
temp->next=NULL;
temp->prev=NULL;

{
temp->value=value;
}
else
{
cur->next=temp;
temp->prev=cur;
temp->value=value;
}
}

// Function to print the LL
void print_list(char *listName, struct node *head)
{
mynode *temp;

printf("\n[%s] -> ", listName);
{
printf("[%d]->",temp->value);
}

printf("NULL\n");

}

In a similar way, we can find the 1/3 th node of linked list by changing (i%2==1) to (i%3==1) and in the same way we can find nth node of list by changing (i%2==1) to (i%n==1) but make sure ur (n<=i).

Anonymous said...

u are doing a very good job....but can u please try it in c# also...that would be great

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sandeep said...

Anonymous said...

Thanks Vijay! If you could also post this in Java it would be very helpful.

There's another nice article on how to delete a node in the middle of a linked list right here:

Delete node in middle of linked list

Java pro said...

Cool. By the way if you want to do it in Java than here is a sample program to find middle element of LinkedList in Java

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