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#include <stdlib.h>
#include <iostream>
using namespace std;
struct node
{
int no;
struct node *next;
};
int main()
{
int choice;
struct node *head, *temp, *p;
do
{
cout << "n1. to make listn";
cout << "2. to Insert at begeningn";
cout << "3. to Insert at end n";
cout << "4. to Insert at specificn";
cout << "5. to Displayn";
cout << "6. to Quitn";
cout << "enter your choice:";
cin >> choice;
if (choice == 1)
{
int a;
cout << "enter head node value:";
cin >> a;
head = (struct node *)malloc(sizeof(struct node));
head->no = a;
head->next = 0;
p = head;
for (int i = 0; i < 3; i++)
{
int b;
cout << "enter no for parent node:";
cin >> b;
temp = (struct node *)malloc(sizeof(struct node));
temp->no = b;
temp->next = 0;
p->next = temp;
p = p->next;
}
}
else if (choice == 2)
{
int c;
cout << "enter to insert at begening:";
cin >> c;
temp = (struct node *)malloc(sizeof(struct node));
temp->no = c;
temp->next = head;
head = temp;
}
else if (choice == 3)
{
int d;
cout << "enter no to insert at end:";
cin >> d;
temp = (struct node *)malloc(sizeof(struct node *));
temp->no = d;
temp->next = 0;
p = head;
while (p->next != NULL)
{
p = p->next;
}
p->next = temp;
}
else if (choice == 4)
{
int flag = false, e;
cout << "enter no to insert after:";
cin >> e;
p = head;
while (p != NULL)
{
if (p->no == e)
{
flag = true;
break;
}
p = p->next;
}
if (flag == true)
{
int f;
cout << "no. to replace before:";
cin >> f;
temp = (struct node *)malloc(sizeof(struct node *));
temp->no = f;
temp->next = p->next;
p->next = temp;
}
else
{
cout << "not found";
}
}
else if (choice == 5)
{
p = head;
cout << "link list=";
while (p != NULL)
{
cout << p->no << " ";
p = p->next;
}
}
} while (choice != 6);
}
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