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pointers-task.cpp
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pointers-task.cpp
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#include <iostream>
#include <cstdlib>
using namespace std;
struct node
{
int data;
struct node *next;
};
node *head= NULL;
int count()
{
node *n;
int c=0;
n=head;
while(n!=NULL)
{
n=n->next;
c++;
}
return c;
}
void appendNode(int num)
{
node *temp,*right;
temp = new node;
temp->data=num;
if(head == NULL)
{
temp->next = NULL;
head = temp;
}
else
{
right=head;
while(right->next != NULL)
right=right->next;
right->next =temp;
right=temp;
right->next=NULL;
}
}
void addFirst( int num )
{
node *temp;
temp = new node;
temp->data=num;
if (head== NULL)
{
head=temp;
head->next=NULL;
}
else
{
temp->next=head;
head=temp;
}
}
void addAfter(int num, int loc)
{
int i;
struct node *temp,*left,*right;
right=head;
for(i=1;i<loc;i++)
{
left=right;
right=right->next;
}
temp = new node;
temp->data=num;
left->next=temp;
left=temp;
left->next=right;
return;
}
int delNode(int num)
{
node *temp, *prev;
temp=head;
while(temp!=NULL)
{
if(temp->data==num)
{
if(temp==head)
{
head=temp->next;
delete temp;
return 1;
}
else
{
prev->next=temp->next;
delete temp;
return 1;
}
}
else
{
prev=temp;
temp= temp->next;
}
}
return 0;
}
void displayList()
{
node *r;
r=head;
if(r==NULL)
{
return;
}
while(r!=NULL)
{
cout<<"[ "<<r->data<<" ]"<<" -> ";
r=r->next;
}
printf("NULL\n");
}
int main(int argc, char** argv)
{
int i,num;
node *n;
head=NULL;
while(1)
{
cout<<"\n\t\t\t\tList Operations\n";
cout<<"\t\t\t\t=================\n";
cout<<"\t\t\t\t1.Add Node at Start\n";
cout<<"\t\t\t\t2.Append Node\n";
cout<<"\t\t\t\t3.Delete Node\n";
cout<<"\t\t\t\t4.Display List\n";
cout<<"\t\t\t\t5.Size of the List?\n";
cout<<"\t\t\t\t6.Clear Screen\n";
cout<<"\t\t\t\t7.Exit\n";
cout<<"\n\t\t\t\tEnter your choice : ";
cin>>i;
if(i<=0)
{
cout<<"\n\t\tEnter only an Integer\n";
exit(0);
}
else
{
switch(i)
{
case 1:
cout<<"\nEnter the number to insert : ";
cin>>num;
addFirst(num);
break;
case 2:
cout<<"\nEnter the number to insert : ";
cin>>num;
appendNode(num);
break;
case 3:
if(head==NULL)
cout<<"\nList is Empty\n";
else
{
cout<<"\nEnter the number to delete : ";
cin>>num;
if(delNode(num))
cout<<"\n"<<num<<" deleted successfully \n";
else
cout<<"\n"<<num<<" not found in the list\n";
}
break;
case 4:
if(head==NULL)
{
cout<<"\nList is Empty\n";
}
else
{
cout<<"\nElement(s) in the list are : \n\n";
}
displayList();
cout<<"\n";
break;
case 5:
cout<<"\nSize of the list is : "<<count()<<"\n";
break;
case 6:
system("cls");
break;
case 7:
return 0;
default:
cout<<"\nInvalid option\n";
}
}
}
return 0;
}