C Exercises: Delete a node from the middle of Singly Linked List
C Singly Linked List : Exercise-8 with Solution
Write a program in C to delete a node from the middle of a Singly Linked List.
Pictorial Presentation:

Sample Solution:
C Code:
#include <stdio.h>
#include <stdlib.h>
struct node
{
int num; //Data of the node
struct node *nextptr; //Address of the node
}*stnode;
void createNodeList(int n); //function to create the list
void MiddleNodeDeletion(int pos); //function to delete a node from middle
void displayList(); //function to display the list
int main()
{
int n,num,pos;
printf("\n\n Linked List : Delete a node from the middle of Singly Linked List. :\n");
printf("-------------------------------------------------------------------------\n");
printf(" Input the number of nodes : ");
scanf("%d", &n);
createNodeList(n);
printf("\n Data entered in the list are : \n");
displayList();
printf("\n Input the position of node to delete : ");
scanf("%d", &pos);
if(pos<=1 || pos>=n)
{
printf("\n Deletion can not be possible from that position.\n ");
}
if(pos>1 && pos<n)
{
printf("\n Deletion completed successfully.\n ");
MiddleNodeDeletion(pos);
}
printf("\n The new list are : \n");
displayList();
return 0;
}
void createNodeList(int n)
{
struct node *fnNode, *tmp;
int num, i;
stnode = (struct node *)malloc(sizeof(struct node));
if(stnode == NULL) //check whether the stnode is NULL and if so no memory allocation
{
printf(" Memory can not be allocated.");
}
else
{
// reads data for the node through keyboard
printf(" Input data for node 1 : ");
scanf("%d", &num);
stnode-> num = num;
stnode-> nextptr = NULL; //Links the address field to NULL
tmp = stnode;
//Creates n nodes and adds to linked list
for(i=2; i<=n; i++)
{
fnNode = (struct node *)malloc(sizeof(struct node));
if(fnNode == NULL) //check whether the fnnode is NULL and if so no memory allocation
{
printf(" Memory can not be allocated.");
break;
}
else
{
printf(" Input data for node %d : ", i);
scanf(" %d", &num);
fnNode->num = num; // links the num field of fnNode with num
fnNode->nextptr = NULL; // links the address field of fnNode with NULL
tmp->nextptr = fnNode; // links previous node i.e. tmp to the fnNode
tmp = tmp->nextptr;
}
}
}
}
void MiddleNodeDeletion(int pos)
{
int i;
struct node *toDelMid, *preNode;
if(stnode == NULL)
{
printf(" There are no nodes in the List.");
}
else
{
toDelMid = stnode;
preNode = stnode;
for(i=2; i<=pos; i++)
{
preNode = toDelMid;
toDelMid = toDelMid->nextptr;
if(toDelMid == NULL)
break;
}
if(toDelMid != NULL)
{
if(toDelMid == stnode)
stnode = stnode->nextptr;
preNode->nextptr = toDelMid->nextptr;
toDelMid->nextptr = NULL;
free(toDelMid);
}
else
{
printf(" Deletion can not be possible from that position.");
}
}
}
void displayList()
{
struct node *tmp;
if(stnode == NULL)
{
printf(" No data found in the list.");
}
else
{
tmp = stnode;
while(tmp != NULL)
{
printf(" Data = %d\n", tmp->num); // prints the data of current node
tmp = tmp->nextptr; // advances the position of current node
}
}
}
Sample Output:
Linked List : delete a node from the middle of Singly Linked List. : ------------------------------------------------------------------------- Input the number of nodes : 3 Input data for node 1 : 2 Input data for node 2 : 5 Input data for node 3 : 8 Data entered in the list are : Data = 2 Data = 5 Data = 8 Input the position of node to delete : 2 Deletion completed successfully. The new list are : Data = 2 Data = 8
Flowchart:

createNodeList() :

MiddleNodeDeletion() :

displayList() :

C Programming Code Editor:
Previous: Write a program in C to delete first node of Singly Linked List.
Next: Write a program in C to delete the last node of Singly Linked List.
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