Linked List Program error in C++ - c++

Question

I tried implementing Linked List using C++ using a structure.
I've included three functions - Size, Insertion and Deletion from the end.
The program compiled successfully. During execution, when I tried to give input for the LLInsert() function, there was just a cursor blinking on my execution window. I don't know if the function returned to main.
Also the LLSize() doesn't return 0 when I try to find the Size of a empty list.
I can't seem to figure out what I'm doing wrong. Here is my code.
#include<iostream>
using namespace std;
struct LL {
LL *next = NULL;
int data;
};
int LLSize(LL *head) {
LL *current = new LL;
current = head;
int count = 0;
while(current != NULL) {
current = current -> next;
count ++;
}
return count;
}
void LLInsert(LL *head,int value) {
LL *current = new LL;
current = head;
LL *Newnode = new LL;
Newnode -> data = value;
Newnode -> next = NULL;
if(head == NULL) {
head = Newnode;
return;
}
while(current->next != NULL) {
current = current->next;
}
current->next = Newnode;
return;
}
int LLDelete(LL *head) {
LL *current = new LL;
current = head;
int deleteddata;
while(current->next->next != NULL) {
current = current->next;
}
current->next->data = deleteddata;
current->next = NULL;
return deleteddata;
}
int main() {
int choice;
LL *A;
while(1) {
cout << "1. Size\n2. Insert\n3. Delete\n4. Exit" << endl;
cout << "Enter a choice : ";
cin >> choice;
switch(choice) {
case 1 : {
cout << "\nLength = " << LLSize(A) << endl;
break;
}
case 2 : {
int value;
cout << "\nEnter the element to insert : ";
cin >> value;
LLInsert(A,value);
break;
}
case 3 : {
cout << LLDelete(A);
break;
}
case 4 : {
exit(0);
}
default : {
cout << "\nInvalid choice. Enter a valid choice " << endl;
break;
}
}
}
}

Answer 1

Don't use using namespace.
Create a type for the list and a type for the nodes
struct LL {
LL* next;
int data;
};
struct L {
LL* head;
};
Use references and don't allocate new memory in each function
int LLSize(L& list) {
LL *current = list.head;
Check if the head of the list is set and use nullptr
if (list.head == nullptr) {
Use an instance of the list and not a pointer
int main() {
int choice;
L A;
Use a debugger like gdb to analyze your program.
Clean up at the end. Delete memory you allocated with new. One delete for each new.