Circular Linked List in C - Data Structures Source Code in C

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Home » C Home » Data Structures Home » Circular Linked List in C

A D V E R T I S E M E N T

Title	Circular Linked List in C
Author	Jagarengan
Author Email	rahul82 [at] rosecards.com
Description	Implementation of Circular linked List.
Category	C » Data Structures
Hits	389717
Code	Select and Copy the Code
#include<stdio.h> #include<conio.h> #include<stdlib.h> #include<alloc.h> #define null 0 struct node { int info; struct node link; }start; void main() { int ch,n,m,position,i; last=null; while(1) { printf("1.create 2.addat 3.addbt 4.del 5.disp 6.exit "); printf("er ur ch"); scanf("%d",&ch); switch(ch) { case 1: printf("er no of itc"); scanf("%d",&n); for(i=0;i<n;i++) { printf("er the element"); scanf("%d",&m); create(m); }break; case 2: printf("er the element"); scanf("%d",&m); addat(m); break; case 3: printf("er the element"); scanf("%d",&m); printf("er the position"); scanf("%d",&position); addbt(m,position); break; case 4: if(last==null) { printf("list is empty"); continue; } printf("er the element for delete"); scanf("%d",&m); del(m); break; case 5: disp(); break; case 6: exit(0); break; default: printf("wrong choice"); } } } create(int data) { struct node q,tmp; tmp=(struct node )malloc(sizeof(struct node)); tmp->info=data; tmp->link=null; if(last==null) { last=tmp; tmp->link=last; } else { tmp->link=last->link; last->link=tmp; last=tmp; }} addat(int data) { struct node q,tmp; tmp=(struct node )malloc(sizeof(struct node)); tmp->info=data; tmp->link=last->link; last->link=tmp; } addbt(int data,int pos) { struct node tmp,q; int i; q=last->link;; for(i=0;i<pos-1;i++) { q=q->link; if(q==last->link) { printf("there r lessthan %d elements",pos); return; } } tmp=(struct node )malloc(sizeof(struct node)); tmp->link=q->link; tmp->info=data; q->link=tmp; if(q==last) last=tmp; } del(int data) { struct node tmp,q; if(last->link==last&&last->info==data) { tmp=last; last=null; free(tmp); return; } q=last->link; if(q->info==data) { tmp=q; last->link=q->link; free(tmp); return; } while(q->link!=last) { if(q->link->info==data) { tmp=q->link; q->link=tmp->link; free(tmp); printf("element %d is deleted",data); } if(q->link->info=data) { tmp=q->link; q->link=last->link; free(tmp); last=q; return;} printf("element%d is not found",data); } disp() { struct node q; if(last==null) { printf("list isdempty"); return; }q=last->link; while(q!=last) { printf("%d",q->info); q=q->link; } printf("%d",last->info); }

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