C Tutorial/Data Structure/Linked list
Inserting a node by using recursive programs
<source lang="cpp"># include <stdio.h>
# include <stdlib.h>
struct node
{
int data;
struct node *link;
};
struct node *insert(struct node *p, int n)
{
struct node *temp;
if(p==NULL)
{
p=(struct node *)malloc(sizeof(struct node));
if(p==NULL)
{
printf("Error\n");
exit(0);
}
p-> data = n;
p-> link = NULL;
} else{
p->link = insert(p->link,n);
}
return (p);
}
void printlist ( struct node *p )
{
printf("The data values in the list are\n");
while (p!= NULL)
{
printf("%d\t",p-> data);
p = p-> link;
}
}
void main()
{
int n =10;
int x;
struct node *start = NULL ;
while ( n-- > 0 )
{
start = insert ( start, n );
}
printf("The created list is\n");
printlist ( start );
}</source>
The created list is The data values in the list are 9 8 7 6 5 4 3 2 1 0
Linked Lists
- Each element in a linked list can be placed anywhere in memory.
- The elements are linked with each other using an explicit link field.
- To access the element you can use the starting pointer of the list.
<source lang="cpp"># include <stdio.h>
# include <stdlib.h>
struct node
{
int data;
struct node *link;
};
struct node *insert(struct node *p, int n){
struct node *temp;
if(p==NULL){
p=(struct node *)malloc(sizeof(struct node));
if(p==NULL) {
printf("Error\n");
exit(0);
}
p-> data = n;
p-> link = p;
} else {
temp = p;
while (temp-> link != p)
temp = temp-> link;
temp-> link = (struct node *)malloc(sizeof(struct node));
if(temp -> link == NULL){
printf("Error\n");
exit(0);
}
temp = temp-> link;
temp-> data = n;
temp-> link = p;
}
return (p);
}
void printlist ( struct node *p )
{
struct node *temp;
temp = p;
printf("The data values in the list are\n");
if(p!= NULL)
{
do
{
printf("%d\t",temp->data);
temp=temp->link;
} while (temp!= p);
}
else
printf("The list is empty\n");
}
void main()
{
int n;
int x;
struct node *start = NULL ;
start = insert ( start, 1 );
start = insert ( start, 2);
start = insert ( start, 3 );
start = insert ( start, 4 );
printf("The created list is\n");
printlist ( start );
}</source>
The created list is The data values in the list are 1 2 3 4
