Question

C++ Question

Basically we have to create a program using a singular linked list (please do not answer this question with anything except a singular linked list). This program needs to solve factorials for huge numbers (up to 99,999,999).You should store a maximum eight digits per node and perform double arithmetic to reduce the number of nodes needed for large factorials. More details and some examples will be in the pastebin at the bottom.

The program should print out the answer of the factorial into a new file called newfile.txt. It should print out the amount of digits that are in the number and print out the number itself.

An example of what the output should be is in here: https://pastebin.com/tF0vaBzt

Answer 1

As requested, please find below the implementation of singly linked list.

Single Linked list implementation

#include<iostream>

#include<cstdio>

#include<cstdlib>

#define ull unsigned long long

using namespace std;

/*

* Node Declaration

*/

struct node

{

ull info;

struct node *next;

}*start;

/*

* Class Declaration

*/

class single_llist

{

public:

node* create_node(ull);

void insert_begin();

void insert_pos();

void insert_last();

void delete_pos();

void sort();

void search();

void update();

void reverse();

void display();

single_llist()

{

start = NULL;

}

};

/*

* Main :contains menu

*/

int main()

{

int choice, nodes, element, position, i;

single_llist sl;

start = NULL;

while (1)

{

cout<<endl<<"---------------------------------"<<endl;

cout<<endl<<"Operations on singly linked list"<<endl;

cout<<endl<<"---------------------------------"<<endl;

cout<<"1.Insert Node at beginning"<<endl;

cout<<"2.Insert node at last"<<endl;

cout<<"3.Insert node at position"<<endl;

cout<<"4.Sort Link List"<<endl;

cout<<"5.Delete a Particular Node"<<endl;

cout<<"6.Update Node Value"<<endl;

cout<<"7.Search Element"<<endl;

cout<<"8.Display Linked List"<<endl;

cout<<"9.Reverse Linked List "<<endl;

cout<<"10.Exit "<<endl;

cout<<"Enter your choice : ";

cin>>choice;

switch(choice)

{

case 1:

cout<<"Inserting Node at Beginning: "<<endl;

sl.insert_begin();

cout<<endl;

break;

case 2:

cout<<"Inserting Node at Last: "<<endl;

sl.insert_last();

cout<<endl;

break;

case 3:

cout<<"Inserting Node at a given position:"<<endl;

sl.insert_pos();

cout<<endl;

break;

case 4:

cout<<"Sort Link List: "<<endl;

sl.sort();

cout<<endl;

break;

case 5:

cout<<"Delete a particular node: "<<endl;

sl.delete_pos();

break;

case 6:

cout<<"Update Node Value:"<<endl;

sl.update();

cout<<endl;

break;

case 7:

cout<<"Search element in Link List: "<<endl;

sl.search();

cout<<endl;

break;

case 8:

cout<<"Display elements of link list"<<endl;

sl.display();

cout<<endl;

break;

case 9:

cout<<"Reverse elements of Link List"<<endl;

sl.reverse();

cout<<endl;

break;

case 10:

cout<<"Exiting..."<<endl;

exit(1);

break;

default:

cout<<"Wrong choice"<<endl;

}

}

}

/*

* Creating Node

*/

node *single_llist::create_node(ull value)

{

struct node *temp, *s;

temp = new(struct node);

if (temp == NULL)

{

cout<<"Memory not allocated "<<endl;

return 0;

}

else

{

temp->info = value;

temp->next = NULL;

return temp;

}

}

/*

* Inserting element in beginning

*/

void single_llist::insert_begin()

{

ull value;

cout<<"Enter the value to be inserted: ";

cin>>value;

struct node *temp, *p;

temp = create_node(value);

if (start == NULL)

{

start = temp;

start->next = NULL;

}

else

{

p = start;

start = temp;

start->next = p;

}

cout<<"Element Inserted at beginning"<<endl;

}

/*

* Inserting Node at last

*/

void single_llist::insert_last()

{

ull value;

cout<<"Enter the value to be inserted: ";

cin>>value;

struct node *temp, *s;

temp = create_node(value);

s = start;

while (s->next != NULL)

{

s = s->next;

}

temp->next = NULL;

s->next = temp;

cout<<"Element Inserted at last"<<endl;

}

/*

* Insertion of node at a given position

*/

void single_llist::insert_pos()

{

ull value, pos, counter = 0;

cout<<"Enter the value to be inserted: ";

cin>>value;

struct node *temp, *s, *ptr;

temp = create_node(value);

cout<<"Enter the postion at which node to be inserted: ";

cin>>pos;

int i;

s = start;

while (s != NULL)

{

s = s->next;

counter++;

}

if (pos == 1)

{

if (start == NULL)

{

start = temp;

start->next = NULL;

}

else

{

ptr = start;

start = temp;

start->next = ptr;

}

}

else if (pos > 1 && pos <= counter)

{

s = start;

for (i = 1; i < pos; i++)

{

ptr = s;

s = s->next;

}

ptr->next = temp;

temp->next = s;

}

else

{

cout<<"Positon out of range"<<endl;

}

}

/*

* Sorting Link List

*/

void single_llist::sort()

{

struct node *ptr, *s;

ull value;

if (start == NULL)

{

cout<<"The List is empty"<<endl;

return;

}

ptr = start;

while (ptr != NULL)

{

for (s = ptr->next;s !=NULL;s = s->next)

{

if (ptr->info > s->info)

{

value = ptr->info;

ptr->info = s->info;

s->info = value;

}

}

ptr = ptr->next;

}

}

/*

* Delete element at a given position

*/

void single_llist::delete_pos()

{

int pos, i, counter = 0;

if (start == NULL)

{

cout<<"List is empty"<<endl;

return;

}

cout<<"Enter the position of value to be deleted: ";

cin>>pos;

struct node *s, *ptr;

s = start;

if (pos == 1)

{

start = s->next;

}

else

{

while (s != NULL)

{

s = s->next;

counter++;

}

if (pos > 0 && pos <= counter)

{

s = start;

for (i = 1;i < pos;i++)

{

ptr = s;

s = s->next;

}

ptr->next = s->next;

}

else

{

cout<<"Position out of range"<<endl;

}

free(s);

cout<<"Element Deleted"<<endl;

}

}

/*

* Update a given Node

*/

void single_llist::update()

{

int value, pos, i;

if (start == NULL)

{

cout<<"List is empty"<<endl;

return;

}

cout<<"Enter the node postion to be updated: ";

cin>>pos;

cout<<"Enter the new value: ";

cin>>value;

struct node *s, *ptr;

s = start;

if (pos == 1)

{

start->info = value;

}

else

{

for (i = 0;i < pos - 1;i++)

{

if (s == NULL)

{

cout<<"There are less than "<<pos<<" elements";

return;

}

s = s->next;

}

s->info = value;

}

cout<<"Node Updated"<<endl;

}

/*

* Searching an element

*/

void single_llist::search()

{

ull value;

int pos = 0;

bool flag = false;

if (start == NULL)

{

cout<<"List is empty"<<endl;

return;

}

cout<<"Enter the value to be searched: ";

cin>>value;

struct node *s;

s = start;

while (s != NULL)

{

pos++;

if (s->info == value)

{

flag = true;

cout<<"Element "<<value<<" is found at position "<<pos<<endl;

}

s = s->next;

}

if (!flag)

cout<<"Element "<<value<<" not found in the list"<<endl;

}

/*

* Reverse Link List

*/

void single_llist::reverse()

{

struct node *ptr1, *ptr2, *ptr3;

if (start == NULL)

{

cout<<"List is empty"<<endl;

return;

}

if (start->next == NULL)

{

return;

}

ptr1 = start;

ptr2 = ptr1->next;

ptr3 = ptr2->next;

ptr1->next = NULL;

ptr2->next = ptr1;

while (ptr3 != NULL)

{

ptr1 = ptr2;

ptr2 = ptr3;

ptr3 = ptr3->next;

ptr2->next = ptr1;

}

start = ptr2;

}

/*

* Display Elements of a link list

*/

void single_llist::display()

{

struct node *temp;

if (start == NULL)

{

cout<<"The List is Empty"<<endl;

return;

}

temp = start;

cout<<"Elements of list are: "<<endl;

while (temp != NULL)

{

cout<<temp->info<<"->";

temp = temp->next;

}

cout<<"NULL"<<endl;

}

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