Plzz tell the error in this program

#1

#include
using namespace std;
class node
{
public:
int data;
node* next;

	//constructor
	node(int d)
	{
		int data=d;
		next=NULL;
	}

};
void insertathead(node*&head,int d)
{
//base case
if(head==NULL)
{
head=new node(d);
return;
}
node n=new node(d);
n->next=head;
head=n;
}
void insertattail(node&head,int d)
{
//base case
if(head==NULL)
{
insertathead(head,d);
}
else
{
node temp=head;
while(temp!=NULL)
{
temp=temp->next;
}
noden=new node(d);
temp->next=n;
}

	}
	int length(node *head)
	{
		int l=1;
		while(head!=NULL)
		{
			head=head->next;
			l++;
		}
        return l;
	}
	void insertatmiddle(node* &head,int d,int p)
	{
		//base case
		if(head==NULL)
		{
			insertathead(head,d);
		}
		else if(p>=length(head))
		{
			insertattail(head,d);
		}
	    else
		{
			node *temp=head;
			int j=1;
			while(j<p)
			{
				temp=temp->next;
				j++;
			}
			node*n=new node(d);
			n->next=temp->next;
			temp->next=n;
			
		}
	}
		void print(node *head)
		{
			while(head!=NULL)
			{
				cout<<head->data<<" ,";
				head=head->next;
		
			}
		}

		

	int main()
	{
		node *head=NULL;
		insertathead(head,6);
		insertathead(head,5);
		insertathead(head,3);
		insertathead(head,2);
		insertathead(head,1);
		print(head);
        
		insertattail(head,7);
		insertatmiddle(head,4,4);
		print(head);
		length(head);
		return 0;
	}
#2

Hello @1928214
i have corrected your code and commented the mistakes:


if you have any doubt you can ask here;
Happy Learning!!

#3

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