c++, delete a node Using id - c++

Question

I have a member class, where I want to delete a node using id. I have created a struct for the linked list. all other functions are working properly, but I cannot delete the node at the given position. It works fine when i add member and when i show it, but when it comes to deleting node it does not work.
#include <iostream>
#include <string>
class member {
public:
struct nodetype {
int id;
string name;
string password;
string type;
nodetype* next;
};
member() {
start = NULL;
}
void addMember(int x, string n, string p, string t) {
nodetype* temp = new nodetype();
temp->id = x;
temp->name = n;
temp->password = p;
temp->type = t;
temp->next = start;
start = temp;
}
void showMember()
{
nodetype* temp = start;
while (temp != NULL)
{
cout << temp->id << "\t" << temp->name << "\t" << temp->type << "\t" << temp->password << endl;
temp = temp->next;
}
}
void deleteMember(int x)
{
nodetype* tmp = start;
while (tmp != NULL)
{
if (tmp->id == x)
{
nodetype* del = tmp;
start->next = tmp->next;
delete del;
}
}
}
private:
nodetype* start;
};
int main()
{
member obj;
obj.addMember(1,"joe","123","student");
obj.addMember(2,"john","456","staff");
obj.deleteMember(2);
obj.showMember();
}

Answer 1

First of all in deleteMember functionyou are not moving tmp forward.You can do it like-
void deleteMember(int x)
{
nodetype* tmp = start;
nodetype* prv = NULL;
while (tmp != NULL)
{
if (tmp->id == x)
{
if(prv != NULL)
{
prv->next=tmp->next;
}
else
{
start=tmp->next;
}
delete tmp;
break;
}
prv=tmp;
tmp=tmp->next;
}
}