删除单链表中特定数字范围之外的节点

我正在研究这个程序，它读取文本文件并从文本文件中抓取数据并将其插入链表的节点中。

我有整个程序运行和工作良好，除了节点删除。我是从文本文件过滤的数据，所以我只需要打印出有一定范围内的值的数据。我可以用if()语句做到这一点，它工作得很好，但这不是我想要的结果。

我想删除超出指定范围的节点，并释放它们正在使用的内存。我写了几行代码来尝试这样做，但它最终只是删除了整个列表。所以如果有人能给我指出正确的方向，告诉我我做错了什么，那就太好了!

#include <fstream>
#include <iostream>
using namespace std;
struct Employee
{
    string firstN;
    string lastN;
    float salary;
    float bonus;
    float deduction;
    Employee *link;
};
typedef Employee* EmployPtr;
void insertAtHead( EmployPtr&, string, string, float, float,float );
void insert( EmployPtr&, string, string, float, float,float );
float netSalary( EmployPtr& );
int main()
{
//Open file
fstream in( "payroll.txt", ios::in );
//Read lines
string first, last;
float salary, bonus, deduction;
EmployPtr head = new Employee;
//Inserts all the data into a new node in the linked list, creating a new node each time the loop executes.
while( in >> first >> last >> salary >> bonus >> deduction)
    insertAtHead (head, first, last, salary, bonus, deduction);
//Close file
in.close();
cout << "-Salary in the range of ($45,000 - $60,000)-n" << "Printed in format: First Name, Last Name, Salary, Bonus, Deduction, Net Salary.n";
EmployPtr iter, temp;
for(iter = head; iter!= NULL; iter = iter->link)
{
    temp = head;
    //Deletes nodes outside of range.
    while(netSalary(iter)<45000 || netSalary(iter)>60000)
    {
        EmployPtr nodeToDelete = temp;
        temp = temp->link;
        delete nodeToDelete;
    }
    cout << iter->firstN << ", " << iter->lastN << ", " << iter->salary << ", " << iter->bonus << ", " << iter->deduction << ", " << netSalary(iter) <<endl;
}
    return 0;
}
    //Based off of the input values, this function will create a new node and insert it at the beginning of the linked list. This function ONLY allows insertion at the beginning of the list and no where else.
 void insertAtHead(EmployPtr& head, string firstValue, string lastValue,
            float salaryValue, float bonusValue,float deductionValue)
{
    EmployPtr tempPtr= new Employee;
    tempPtr->firstN = firstValue;
    tempPtr->lastN = lastValue;
    tempPtr->salary = salaryValue;
    tempPtr->bonus = bonusValue;
    tempPtr->deduction = deductionValue;
    tempPtr->link = head;
    head = tempPtr;
}
//Based off of the input values, this function creates a new node and inserts it AFTER the node provided in the argument.
void insert(EmployPtr& afterNode, string firstValue, string lastValue,
        float salaryValue, float bonusValue,float deductionValue)
{
    EmployPtr tempPtr= new Employee;

    tempPtr->firstN = firstValue;
    tempPtr->lastN = lastValue;
    tempPtr->salary = salaryValue;
    tempPtr->bonus = bonusValue;
    tempPtr->deduction = deductionValue;
    tempPtr->link = afterNode->link;
    afterNode->link = tempPtr;
}
//This function calculates a net salary based off of the salary, bonus, and deduction variables of the input node.
float netSalary(EmployPtr& node)
{
    float netSalary, newDeduction;
    newDeduction = ((node->salary) + (node->bonus)) * (node->deduction);
    netSalary = (node->salary + node->bonus) - newDeduction;
    return netSalary;
}

编辑:更改&&返回到||仍然有问题。

EDIT #2: Solution

while(netSalary(iter)<45000 || netSalary(iter)>60000)
        {
            EmployPtr nodeToDelete = new Employee;
            nodeToDelete = iter;
            iter = iter->link;
            delete nodeToDelete;
        }