C19 updated entire code
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@ -1,60 +1,339 @@
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// This code creates a linked list to store PRN and names of n number of students.
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// We're not sure if there's anything more to it. For now, it only stores and displays.
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#include<iostream>
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using namespace std;
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class node {
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class student
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{
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int roll;
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string name;
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node *next;
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student *next;
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public:
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static node* create();
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void display(node* head);
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student* create();
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void display(student *head);
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student* beg_add(student *head);
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student* end_add(student *head);
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student* btwn_add(student *head);
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student* beg_del(student *head);
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student* end_del(student *head);
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student* btwn_del(student *head);
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student* total(student *head);
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student* con(student *head,student *head1);
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};
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node* node::create() {
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int total;
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node *head=NULL;
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node* point=NULL;
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cout<<"Total number of students are:\t";
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cin>>total;
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for (int i=0; i<total; i++) {
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if (head==NULL) {
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head = new node;
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cout<<"Enter PRN number for student "<<i+1<<":\t";
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student* student::create()
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{
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int n;
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student *head,*p;
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head = NULL;
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cout<<"Enter number of members: ";
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cin>>n;
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for(int i = 0; i<n; i++)
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{
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if(head == NULL)
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{
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head = new student;
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cout<<"\nEnter prn of president: ";
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cin>>head->roll;
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cout<<"Enter name for student "<<i+1<<":\t";
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cout<<"Enter name of president: ";
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cin>>head->name;
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head->next = NULL;
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point=head;
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p = head;
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}
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else {
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point->next=new node;
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point=point->next;
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cout << "Enter PRN number for student "<<i+1<<":\t";
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cin>>point->roll;
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cout << "Enter name for student "<<i+1<<":\t";
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cin>>point->name;
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point->next=NULL;
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else
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{
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p->next = new student;
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p = p->next;
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cout<<"\nEnter prn of member: ";
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cin>>p->roll;
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cout<<"Enter name of member: ";
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cin>>p->name;
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p->next = NULL;
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}
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}
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return head;
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}
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void student::display(student *head)
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{
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student *p;
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for(p = head; p->next!= NULL; p = p->next)
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{
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cout<<p->roll<<" "<<p->name<<"->";
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}
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cout<<p->roll<<" "<<p->name<<endl;
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}
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student* student::beg_add(student *head)
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{
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student *p;
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p = new student;
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cout<<"\nEnter prn of new president: ";
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cin>>p->roll;
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cout<<"Enter name of new president: ";
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cin>>p->name;
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p->next = NULL;
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p->next = head;
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head = p;
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return head;
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}
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student* student::end_add(student *head)
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{
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student *p,*q;
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p = new student;
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cout<<"\nEnter prn of secretary: ";
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cin>>p->roll;
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cout<<"Enter name of secretary: ";
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cin>>p->name;
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p->next = NULL;
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for(q = head; q->next!=NULL; q = q->next);
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q->next = p;
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return head;
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}
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student* student::btwn_add(student *head)
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{
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int y;
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student *p,*q;
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p = new student;
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cout<<"\nEnter prn of new member: ";
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cin>>p->roll;
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cout<<"Enter name of new member: ";
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cin>>p->name;
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cout<<"Enter prn after which new member is to be added: ";
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cin>>y;
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p->next = NULL;
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q = head;
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while(q!=NULL)
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{
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if(q == NULL)
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{
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cout<<"\nInvalid Data....."<<endl;
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}
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else if(q->roll == y)
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{
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p->next = q->next;
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q->next = p;
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}
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q = q->next;
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}
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return head;
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}
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void node::display(node* head) {
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node* point=this;
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cout<<endl<<"PRNs and names are:"<<endl;
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for (point=head; point!=NULL; point=point->next) {
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cout<<point->roll<<" -> "<<point->name<<endl;
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}
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cout<<endl<<"## DESIGNED AND ENGINEERED BY KSHITIJ\n## END OF CODE"<<endl;
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student* student::beg_del(student *head)
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{
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student *p;
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p = head;
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head = head->next;
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delete p;
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return head;
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}
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student* student::end_del(student *head)
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{
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student *p,*q;
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for(q = head; q->next->next!=NULL; q = q->next);
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p = q->next;
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delete p;
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q->next = NULL;
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}
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student* student::btwn_del(student *head)
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{
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int y;
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student *p,*q;
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cout<<"\nEnter prn of member which is to be deleted: ";
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cin>>y;
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if(head == NULL)
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{
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cout<<"\nLinked list is empty!!";
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return head;
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}
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p = head;
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while(p->next!=NULL)
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{
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if(p->next->roll==y)
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{
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q = p->next;
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p->next = p->next->next;
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delete q;
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}
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p = p->next;
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}
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return head;
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}
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student* student::total(student *head)
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{
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student *p;
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int total = 0;
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for(p = head; p!=NULL; p = p->next)
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{
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total++;
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}
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cout<<"\nTotal Number of students are: "<<total<<endl;
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}
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student* student::con(student *head,student *head1)
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{
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student *p;
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for(p = head; p->next!=NULL; p = p->next);
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p->next = head1;
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return head;
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}
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int main()
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{
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int flag = 1;
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int flag1 = 1;
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int flag2 = 1;
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int char0,char1,char2;
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student *head,*head1;
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student obj;
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while(flag)
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{
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cout<<"\nYOUR CHOICES ARE: ";
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cout<<"\n1. LINKED LIST1: \n2. LINKED LIST2: \n3. CONCATENATE LINKED LIST 1 & 2: \n4. EXIT";
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cout<<"\nEnter choice: ";
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cin>>char0;
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switch(char0)
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{
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case 1:
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while(flag1)
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{
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cout<<"\nWhat operations on list1 would you like to perform?";
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cout<<"\n1. Enter prn, name of members: \n2. Add new president: \n3. Add secretary: \n4. Add new members: \n5. Remove president: \n6. Remove secretary: \n7. Remove members: \n8. Total members present: \n9. Exit ";
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cout<<"\nEnter choice: ";
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cin>>char1;
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switch(char1)
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{
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case 1:
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head = obj.create();
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obj.display(head);
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break;
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case 2:
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head = obj.beg_add(head);
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obj.display(head);
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break;
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case 3:
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head = obj.end_add(head);
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obj.display(head);
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break;
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case 4:
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head = obj.btwn_add(head);
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obj.display(head);
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break;
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case 5:
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cout<<"\nRemoved president: ";
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head = obj.beg_del(head);
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obj.display(head);
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break;
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case 6:
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cout<<"\nRemoved secretary: ";
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obj.end_del(head);
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obj.display(head);
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break;
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case 7:
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head = obj.btwn_del(head);
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cout<<"\nMember removed: ";
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obj.display(head);
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break;
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case 8:
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obj.total(head);
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break;
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case 9:
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flag1 = 0;
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break;
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default:
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cout<<"\nEnter valid choice!!!";
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break;
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}
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}
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break;
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case 2:
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while(flag2)
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{
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cout<<"\nWhat operations on list1 would you like to perform?";
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cout<<"\n1. Enter prn, name of members: \n2. Add new president: \n3. Add secretary: \n4. Add new members: \n5. Remove president: \n6. Remove secretary: \n7. Remove members: \n8. Total members present: \n9. Exit ";
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cout<<"\nEnter choice: ";
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cin>>char2;
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switch(char2)
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{
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case 1:
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head1 = obj.create();
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obj.display(head1);
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break;
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case 2:
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head1 = obj.beg_add(head1);
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obj.display(head1);
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break;
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case 3:
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head1 = obj.end_add(head1);
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obj.display(head1);
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break;
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case 4:
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head1 = obj.btwn_add(head1);
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obj.display(head1);
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break;
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case 5:
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cout<<"\nRemoved president: ";
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head1 = obj.beg_del(head1);
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obj.display(head1);
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break;
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case 6:
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cout<<"\nRemoved secretary: ";
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obj.end_del(head1);
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obj.display(head1);
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break;
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case 7:
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head1 = obj.btwn_del(head1);
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cout<<"\nMember removed: ";
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obj.display(head1);
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break;
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case 8:
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obj.total(head1);
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break;
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case 9:
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flag2 = 0;
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break;
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default:
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cout<<"\nEnter valid choice!!!";
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break;
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}
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}
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break;
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case 3:
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head = obj.con(head,head1);
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obj.display(head);
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break;
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case 4:
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flag = 0;
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break;
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default:
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cout<<"\nEnter valid choice: ";
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break;
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}
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}
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int main() {
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node* head = node::create();
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head->display(head);
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return 0;
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}
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