Delete from a singly linked list

[oudavid1]

I am trying to remove numbers that are less than a calculated average from a SSL.

Here is the section where I am running into error. I am having trouble at the test for the data.amt < average (here is where I want to remove the element and reassign the prev(ious) pointer). If I run this code it seems to test properly for what I am looking for, I just cant figure out to logic of changing the point values to "work around" or "ignore" the nodes that I do not want in the list any longer. Any advice would be much appreciated. Thank you.

void List::remove(float average){
	int x=0;
	int y=0;
	int z=0;
	Node* temp = head;
	Node* prev = head;
	while (temp->data.amt < average){
				head = temp->next;
				prev->next = head;
				x++;
			}
	while (temp !=NULL){
		
		if (temp->data.amt < average){
			prev->next = temp->next;
			
			y++;
		}
		prev = temp->next;
		temp = temp->next;
		z++;
	}
	cout << x << endl;
	cout << y << endl;
	cout << z << endl;
	cout << "-------------------------------" <<endl;
}

Here is the rest of my code for reference.

#include <iostream>
#include <string>
#include <time.h>
#include <stdlib.h>
#include <iomanip>
using namespace std;
int r=0;
struct datatype
	{
		friend ostream &operator<< (ostream &stream, const datatype &dt){
			stream <<"Employee Name: "<<setw(6) <<dt.name << "\nID Number: " 
((((LINE BREAK FOR FORMAT))))<<setw (10) << dt.id <<"\nSalary: "<<setw(12)<< dt.amt <<"$\n"<<endl;
			return stream;
		}
		string name;
		int id;
		float amt;
        datatype(string Name, int Id, float Amt): name(Name), id(Id), amt(Amt) {}
        datatype(void): name(""), id(0), amt(0.0f) {}
		
	};
struct Node
{
		
	datatype data;
	Node *next;
};

class List 
{
	Node *head;
public:
			
			void insert(datatype dat);
			void remove(float average);
			void printEvery20();
			void print();
			List(){head = NULL;}
};

void List::insert( datatype dat )
{
    if( head == NULL )
    {
       head = new Node;
       head->data = dat;
       head->next = NULL;
	
    }
    else
    {
        Node* temp = head;
        while( temp->next != NULL ) temp = temp->next;
        temp->next = new Node;
        temp = temp->next;
        temp->data = dat;
        temp->next = NULL;
		 
    }
}
void List::remove(float average){
	int x=0;
	int y=0;
	int z=0;
	Node* temp = head;
	Node* prev = head;
	while (temp->data.amt < average){
				head = temp->next;
				prev->next = head;
				x++;
			}
	while (temp !=NULL){
		
		if (temp->data.amt < average){
			prev->next = temp->next;
			
			y++;
		}
		prev = temp->next;
		temp = temp->next;
		z++;
	}
	cout << x << endl;
	cout << y << endl;
	cout << z << endl;
	cout << "-------------------------------" <<endl;
}
void List::printEvery20()
{int r=1;
	int listCount=1;
    if( head == NULL )
    {
cout <<"list is empty " <<endl;
    }
    else
    {
        Node* temp = head;
		
		while (temp!= NULL){
			if((listCount % 50) == 0)
				{
					cout << temp->data;
					r++;
					listCount++;
				}
		temp = temp->next;
		listCount++;
		//cout <<" listCount: "<< listCount;
		}
		
		
    }
}
void List::print()
{int r=1;
	int listCount=1;
    if( head == NULL )
    {
cout <<"list is empty " <<endl;
    }
    else
    {
        Node* temp = head;
		
		while (temp!= NULL){
					cout << temp->data;
		temp = temp->next;
		r++;
		}
		
		
    }
	cout << " r is : : : " <<r<<endl;
}

char genFirst(){
char c=NULL;
do {c = (rand()%26)+65;}
while (c == 65 || c == 69 || c == 73 || c == 79 || c ==85);
return c;
}
char genVowel(){
char c=NULL;
while (c != 97 && c != 101 && c != 105 && c != 111 && c !=117)
	{
		c = (rand()%26)+97;
}
return c;
}
char genLast(){
char c=NULL;
do {c = (rand()%26)+97;}
while (c == 97 || c == 101 || c == 105 || c == 111 || c ==117);
return c;
}
int randId (){
	int id = rand();
	return id;
}
float randSal () {
	double sal = rand()%10000;
	return sal;
}

float averageRemove (float ar[]) {
	int size = sizeof(ar) / sizeof(float);
	float average =0;
	for (int i=0; i<size;i++){
	average += ar[i];
	average = average / size;
	}
	return average;
}
int main (){
int first=0;
string ok[1000];
int cc[1000];
float dd[1000];
srand (time(NULL));
List myList;
for (int i=0; i<1000; i++){
char f = genFirst();
ok[i] += f;
char s = genVowel();
ok[i] += s;
char l = genLast();
ok[i] += l;
cc[i] = randId();
dd[i] = randSal();
myList.insert(datatype(ok[i], cc[i], dd[i]));
}
float r =  averageRemove(dd);
cout <<"R is: "<< r <<endl;
cin.get();
myList.printEvery20();
system("cls");
cin.get();
myList.remove(r);
cin.get();
system("cls");
myList.print();
system ("color 4f");
cout << "\nProgram Complete"<<endl;
cin.get();
return 0;
}