C Exercises: Search an element in a circular linked list
C Linked List : Exercise-29 with Solution
Write a program in C to search an element in a circular linked list.
Pictorial Presentation:
Sample Solution:
C Code:
#include <stdio.h>
#include <stdlib.h>
struct node {
int num;
struct node * nextptr;
}*stnode,*ennode;
void ClListcreation(int n);
int FindElement(int FindElem, int n);
void displayClList();
int main()
{
int n,m;
int i,FindElem,FindPlc;
stnode = NULL;
ennode = NULL;
printf("\n\n Circular Linked List : Search an element in a circular linked list :\n");
printf("-------------------------------------------------------------------------\n");
printf(" Input the number of nodes : ");
scanf("%d", &n);
m=n;
ClListcreation(n);
displayClList();
printf(" Input the element you want to find : ");
scanf("%d", &FindElem);
FindPlc=FindElement(FindElem,m);
if(FindPlc<n)
printf(" Element found at node %d \n\n",FindPlc);
else
printf(" This element does not exists in linked list.\n\n");
return 0;
}
void ClListcreation(int n)
{
int i, num;
struct node *preptr, *newnode;
if(n >= 1)
{
stnode = (struct node *)malloc(sizeof(struct node));
printf(" Input data for node 1 : ");
scanf("%d", &num);
stnode->num = num;
stnode->nextptr = NULL;
preptr = stnode;
for(i=2; i<=n; i++)
{
newnode = (struct node *)malloc(sizeof(struct node));
printf(" Input data for node %d : ", i);
scanf("%d", &num);
newnode->num = num;
newnode->nextptr = NULL; // next address of new node set as NULL
preptr->nextptr = newnode; // previous node is linking with new node
preptr = newnode; // previous node is advanced
}
preptr->nextptr = stnode; //last node is linking with first node
}
}
int FindElement(int FindElem, int a)
{
int ctr=1;
ennode=stnode;
while(ennode->nextptr!=NULL)
{
if(ennode->num==FindElem)
break;
else
ctr++;
ennode=ennode->nextptr;
if (ctr==a+1)
break;
}
return ctr;
}
void displayClList()
{
struct node *tmp;
int n = 1;
if(stnode == NULL)
{
printf(" No data found in the List yet.");
}
else
{
tmp = stnode;
printf("\n\n Data entered in the list are :\n");
do {
printf(" Data %d = %d\n", n, tmp->num);
tmp = tmp->nextptr;
n++;
}while(tmp != stnode);
}
}
Sample Output:
Circular Linked List : Search an element in a circular 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 : 9 Data entered in the list are : Data 1 = 2 Data 2 = 5 Data 3 = 9 Input the element you want to find : 5 Element found at node 2
Flowchart :
ClListcreation() :
FindElement() :
displayClList() :
C Programming Code Editor:
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Previous: Write a program in C to delete the node from the end of a circular linked list.
Next: Write a C programming to sort a given linked list by bubble sort.
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C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
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