Searching on Circular linked list in C

C Program for Searching in Circular Linked List

#include<stdio.h> 
#include<conio.h>
#include<stdlib.h>
struct node{
    int data;
    struct node *next;
    };
struct node *head=NULL;
struct node* createNode(){
    struct node *newNode = (struct node *)malloc(sizeof(struct node));
     
return (newNode);
    }
 
void insertNode(){
	struct node *temp,*ptr;
	temp=createNode();
	printf("enter the data you want to insert:");
	scanf("%d",&temp->data);
	temp->next=NULL;
	if(head==NULL){
		head=temp;
		head->next=head;
	}
	else{
		ptr=head;
		while(ptr->next!=head){
			ptr=ptr->next;
		}
	       ptr->next=temp;
	       temp->next=head;
	     }
    }
void search(){
	struct node *temp;
	int data,i=0,flag;
	temp=head;
	if(temp==NULL)
		printf("Linked List is empty");
	else{
		printf("Enter the data you want to search:");
		scanf("%d",&data);
		if(temp->next==head){
		    printf("Value founded at location %d " ,i+1);
		}
		while(temp!=NULL){
			if(temp->data==data){
				printf("Value founded at location %d " ,i+1);
				flag=0;
				break;
			}
			else if(temp->next==head){
				printf("value not found\n");
				break;
			}else{
			    flag=1;
			}
			i++;
			temp=temp->next;
		}
		if(flag==1){
			printf("value not found\n");
		}

		}
	}
 
int menu(){
    int choice;
    printf("\n 1.Add value to the list");
    printf("\n 2.Search an element");
    printf("\n 3.Exit");
    printf("\n Please enter your choice: \t");
    scanf("%d",&choice);
    return(choice);
}
void main(){
    printf("Program for Searching in Circular Linked List");
    while(1){
        switch(menu()){
            case 1:
                insertNode();
                break;
            case 2:
                search();
                break;
            case 3:
                exit(0);
            default:
                printf("invalid choice");
        }
    }
        getch();
    }

Output:

Program for Searching in Circular Linked List
 1.Add value to the list
 2.Search an element
 3.Exit
 Please enter your choice:      1
enter the data you want to insert:5

 1.Add value to the list
 2.Search an element
 3.Exit
 Please enter your choice:      1
enter the data you want to insert:8

 1.Add value to the list
 2.Search an element
 3.Exit
 Please enter your choice:      1
enter the data you want to insert:6

 1.Add value to the list
 2.Search an element
 3.Exit
 Please enter your choice:      2
Enter the data you want to search:8
Value founded at location 2 
 1.Add value to the list
 2.Search an element
 3.Exit
 Please enter your choice:      3