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Title All types of Linked List Operations
Author Shounak Mukherjee
Author Email shounakmuk [at] yahoo.com
Description This program enables a beginner of C to perform any types of operations related to Linked List like Linked List creation;Add element at
the beginning,in between;Delete an element from the beginning,in between,the end,update any element,Reverse traversal of the Linked List
etc.
Category C » Beginners / Lab Assignments
Hits 382020
Code Select and Copy the Code
#include<stdio.h> #include<conio.h> #include<stdlib.h> #include<alloc.h> #include<dos.h> void disp(struct node*); struct node *addbeg(struct node *,int); void addend(struct node *,int); void sortlist(struct node*,int); struct node *addbef(struct node *,int); void addaft(struct node *,int); void addbet(struct node *,int,int); struct node *del(struct node *,int); struct node *befdel(struct node *,int); void aftdel(struct node *,int); void betdel(struct node *,int,int); void update(struct node *,int); void search(struct node *,int); struct node *reverse(struct node *); struct node{ int n; struct node *next; } ; void main() { char ch,boolc1,boolc2,boolc3,boolc4,boolc5,boolc6,boolc7; int i,num,no,addb,adde,befadd,aftadd,fnode,snode,cut,befcut,aftcut,prnode,succ node,change,find; struct node *head,*tail,*ptr; clrscr(); printf("THIS IS A PROGRAM ABOUT LINKED LIST "); printf("supply no. of elements in the linked list "); scanf("%d",&num); head=tail=ptr=NULL; for(i=0;i<num;i++) { printf("supply new node "); scanf("%d",&no); ptr=(struct node*)malloc(sizeof(struct node)); if(tail==NULL) { head=tail=ptr; ptr->n=no; ptr->next=NULL; } else { tail->next=ptr; ptr->n=no; ptr->next=NULL; tail=ptr; } } disp(head); printf("node you want to add before "); scanf("%d",&addb); if(addb>=0) { head=addbeg(head,addb); printf("Now"); disp(head); } else printf("ayou don't! OK "); printf("node you want to add end "); scanf("%d",&adde); if(adde>=0) { addend(head,adde); printf("Now"); disp(head); } else printf("ayou don't! OK "); printf("before which node you want to add? "); scanf("%d",&befadd); head=addbef(head,befadd); printf("Now"); disp(head); printf("after which node you want to add? "); scanf("%d",&aftadd); addaft(head,aftadd); printf("Now"); disp(head); printf("between which two nodes you want to add? "); fflush(stdin); scanf("%d %d",&fnode,&snode); addbet(head,fnode,snode); printf("Now"); disp(head); printf("want to delete any node? (y/n) "); fflush(stdin); scanf("%c",&boolc1); if(boolc1=='y') { printf("supply node to be deleted "); scanf("%d",&cut); head=del(head,cut); printf("Now"); disp(head); } else printf("OK. list remains same "); printf("want to delete before any node? (y/n) "); fflush(stdin); scanf("%c",&boolc2); if(boolc2=='y') { printf("supply that node "); scanf("%d",&befcut); head=befdel(head,befcut); printf("Now"); disp(head); } else printf("OK. list remains same "); printf("want to delete after any node? (y/n) "); fflush(stdin); scanf("%c",&boolc3); if(boolc3=='y') { printf("supply that node "); scanf("%d",&aftcut); aftdel(head,aftcut); printf("Now"); disp(head); } else printf("OK. list remains same "); printf("want to delete node between any two node? (y/n) "); fflush(stdin); scanf("%c",&boolc4); if(boolc4=='y') { printf("supply those nodes "); scanf("%d %d",&prnode,&succnode); betdel(head,prnode,succnode); printf("Now"); disp(head); } else printf("OK. list remains same "); printf("want to update any node? (y/n) "); fflush(stdin); scanf("%c",&boolc5); if(boolc5=='y') { printf("supply node to be updated "); scanf("%d",&change); update(head,change); printf("Now"); disp(head); } else printf("OK. list remains same "); printf("want to search any node? (y/n) "); fflush(stdin); scanf("%c",&boolc6); if(boolc6=='y') { printf("node to be searched "); scanf("%d",&find); search(head,find); } else printf("OK. list remains same "); printf("want to display the list in reverse order? (y/n) "); fflush(stdin); scanf("%c",&boolc7); if(boolc7=='y') { printf("In reverse order"); head=reverse(head); disp(head); } else printf("OK. list remains same "); printf("wish to sort the list? (y/n) "); fflush(stdin); scanf("%c",&ch); if(ch=='y') { sortlist(head,num); printf("after sorting"); disp(head); } else{ printf("Finally"); disp(head); } getch(); } void disp(struct node *head) { struct node *p; p=head; printf(" entire linked list is "); while(p->next!=NULL) { printf("%d->",p->n); p=p->next; if (p->next==NULL) printf("%d ",p->n); } return; } void sortlist(struct node *head,int num) { struct node *temp,*q; int i,j; q=head; temp=(struct node *)malloc(sizeof(struct node)); for(i=0;i<num;i++) for(j=0;j<num-1;j++) { while(q->next!=NULL) { if((q->n)>(q->next->n)) { temp->n=q->n; q->n=q->next->n; q->next->n=temp->n; } q=q->next; } if(q->next==NULL && i<num) q=head; } q=head; return; } struct node *addbeg(struct node *head,int addn) { struct node *p; p=(struct node *)malloc(sizeof(struct node)); p->n=addn; p->next=head; head=p; return head; } void addend(struct node *head,int addn) { struct node *p,*q; p=(struct node *)malloc(sizeof(struct node)); q=head; while(q->next!=NULL) q=q->next; q->next=p; p->n=addn; p->next=NULL; return; } struct node *addbef(struct node *head,int befadd) { struct node *p,*q,*r; int addp; printf("new node "); scanf("%d",&addp); p=(struct node *)malloc(sizeof(struct node)); p->n=addp; q=r=head; while(q->n!=befadd) { r=q; q=q->next; if(q==NULL) break; } if(q==NULL) { printf("anode %d not found ",befadd); delay(1000); return head; } if(q==head) { p->next=q; head=p; return head; } r->next=p; p->next=q; return head; } void addaft(struct node *head,int aftadd) { struct node *p,*q; int addp; printf("new node "); scanf("%d",&addp); p=(struct node *)malloc(sizeof(struct node)); p->n=addp; q=head; while(q->n!=aftadd) { q=q->next; if(q==NULL) break; } if(q==NULL) { printf("anode %d not found ",aftadd); delay(1000); return; } p->next=q->next; q->next=p; return; } void addbet(struct node *head,int no1,int no2) { struct node *p,*q,*r,*s; int addp; // printf("%d %d ",*no1,*no2); printf("new node "); scanf("%d",&addp); p=(struct node *)malloc(sizeof(struct node)); p->n=addp; r=head; q=r; if(q->n!=no1) { r=q; q=q->next; } else { if (q->next->n!=no2) { s=q->next; while(s!=NULL) { s=s->next; if(s->n==no2) { printf("anodes are not successive "); delay(1000); return; } } printf("aillegal node selection "); delay(1000); return; } else { q=q->next; r->next=p; p->next=q; return; } } while(r->n!=no1 || q->n!=no2) { r=q; q=q->next; if(q==NULL) { printf("aillegal node selection "); delay(1000); return; } } r->next=p; p->next=q; return; } struct node *del(struct node *head,int cut) { struct node *p,*q; p=head; q=p; while(p->n!=cut) { q=p; p=p->next; if(p==NULL) { printf("anode %d not found ",cut); delay(1000); return head; } } if(p==head) { head=q->next; q=head; free(p); return head; } q->next=p->next; free(p); return head; } struct node *befdel(struct node *head,int befcut) { struct node *p,*q; p=head; q=p; while(p->next->n!=befcut) { q=p; p=p->next; if(p==NULL) { printf("anode %d not found ",befcut); delay(1000); return head; } } if(p==head) { head=q->next; q=head; free(p); return head; } q->next=p->next; free(p); return head; } void aftdel(struct node *head,int aftcut) { struct node *p,*q; p=head; q=p; while(q->n!=aftcut) { q=p; p=p->next; if(p==NULL) { if(q->next==NULL) printf("ano node after node %d ",aftcut); else printf("anode %d not found ",aftcut); delay(1000); return; } } if(q==head) p=q->next; q->next=p->next; free(p); return; } void betdel(struct node *head,int prnode,int succnode) { struct node *p,*q,*r,*s; p=head; q=p; if(p->n!=prnode) { q=p; p=p->next; } else { r=p->next; if(r->next->n!=succnode) { s=r->next; while(s!=NULL) { s=s->next; if(s->n==succnode) { printf("amore nodes between those nodes "); delay(1000); return; } } printf("aillegal node selection "); delay(1000); return; } else { q->next=r->next; free(r); return; } } while(q->n!=prnode || p->next->n!=succnode) { q=p; p=p->next; if(p->next==NULL) { printf("aillegal node selection "); delay(1000); return; } } q->next=p->next; free(p); return; } void update(struct node *head,int change) { struct node *p; int upd; p=head; printf("updated node "); scanf("%d",&upd); while(p->n!=change) { p=p->next; if(p==NULL) { printf("anode %d not found ",change); delay(1000); return; } } p->n=upd; return; } void search(struct node *head,int find) { struct node *p; int j=1; p=head; while(p->n!=find) { p=p->next; j++; if(p==NULL) { printf(" SORRY. node %d is not present ",find); delay(1000); return; } } printf("aYES! the node %d is present in the %dth position ",find,j); delay(1000); return; } struct node *reverse(struct node *head) { struct node *t1,*t2; t1=head->next; t2=t1->next; head->next=NULL; while(t1!=NULL) { t1->next=head; head=t1; t1=t2; t2=t2->next; } return head; }

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