List not printing all the Elements - c++

Question

So basically I created a linked list with the append and prepend functions and when I print the list it is only printing out 12 which I prepended to front of the list and not the other elements, how do I fix this issue? so that all the elements will be printed. I think that my append and prepend functions are correct but I do not know what could be wrong.
#include <iostream>
#include "List.h"
using namespace std;
int main() {
List* list = new List();
list->Append(1);
list->Append(2423);
list->Prepend(12);
list->print();
system("pause");
return 0;
}
#include<iostream>
#include "List.h"
using namespace std;
List::List() {
this->HEAD = NULL;
this->TAIL=NULL;
}
void List::Append(int Data_val) {
NODE* Current = new NODE;
Current->data = Data_val;
if (HEAD == NULL) {
HEAD = Current;
TAIL = Current;
Current->next = nullptr;
}
else {
TAIL->next= Current;
TAIL = Current;
Current->next = nullptr;
}
}
void List::Prepend(int data_val) {
NODE* Current = new NODE;
Current->data = data_val;
if (HEAD = NULL) {
Current->next = nullptr;
HEAD = Current;
TAIL = Current;
}
else {
Current->next = HEAD;
HEAD = Current;
Current->next = nullptr;
}
}
void List::print() {
NODE* Current = HEAD;
while (Current != NULL) {
cout << Current->data << endl;
Current=Current->next;
}
}
#ifndef LIST_H
#define LIST_H
struct NODE {
int data;
NODE* next;
};
class List
{
public:
List();
void Append(int data_val);
void Prepend(int data_val);
//create prepend
//create insertafter
//create delte
void print();
private:
//
NODE * HEAD;
NODE* TAIL;
};
#endif

Answer 1

You havae a bug with your List::Prepand() method. The "Current->next = nullptr;"
line is not needed within "else" block.
void List::Prepend(int data_val) {
NODE* Current = new NODE;
Current->data = data_val;
if (HEAD == NULL) {
Current->next = nullptr;
HEAD = TAIL = Current;
}
else {
Current->next = HEAD;
HEAD = Current;
Current->next = nullptr; // <---- remove this line
}
}