Removing Line From Text Doc

[mackw44]

I'm trying to remove a line in my text document so that when I run it the UI asks if you would like to remove the item thats in the external document called removeitem.txt and then it should read the line in removeitem and remove it from main.txt but im running into problems. Do any of you no the issue?

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <vector>

using namespace std;

//Variables
int choice;
string item;
string line;
int num;
string temp;
string searchitem;

//Functions
int answer();


int main()
{
    cout << "Welcome To The Store" << endl;
    cout << "Please Choose A Option"  << endl;
    cout << endl;
    cout << "1 - Display All Items In Store" << endl;
    cout << "2 - Check Prices" << endl;
    cout << "3 - Add New Items" << endl;
    cout << "4 - Remove Items" << endl;
    cout << endl;
    cin >> choice;
    answer();
    system("pause");
}
int answer()
{
    if (choice==1)
    {
                  num = 0;
              string item;
              ifstream tempfile("temp.txt");
              ifstream myfile("newitem.txt");
              ofstream secondfile("main.txt",ios::app);
              ifstream secondfile2("main.txt");
              ifstream ifs( "newitem.txt" );
              
              if (myfile.is_open() )
              {
                     vector<string> text_file;
                     string temp;
                     while( getline( secondfile2, temp ) )
                     {
                            string name,price;
                            istringstream liness(temp);
                            getline(liness, name, ' ');
                            getline(liness, price, ' ');
                            cout <<"Item: " << name<< " - "<< "Price: " << price << endl;
                            
                          //cout << "rar" << temp << endl;
                          text_file.push_back( temp );
                          num = 0;
                          getline(myfile,item);
                         
                         //cout << "item" << item << " " << "temp" << temp << endl;
                         }                         
              } 
              }
    if(choice == 2)
    {
              num = 0;
              string item;
              ifstream tempfile("temp.txt");
              ifstream myfile("newitem.txt");
              ofstream secondfile("main.txt",ios::app);
              ifstream secondfile2("main.txt");
              ifstream ifs( "newitem.txt" );
              if (myfile.is_open() )
              {
                                   cout << "What is the item?" << endl;
                                   cin >> searchitem;
                                   vector<string> text_file;
                                   string temp;
                                   while( getline( secondfile2, temp ) )
                                   {
                                   string name,price;
                                   istringstream liness(temp);
                                   getline(liness, name, ' ');
                                   getline(liness, price, ' ');
                                   text_file.push_back( temp );
                                   num = 0;
                                  getline(myfile,item);
                                 
                                
                                 // cout << "si" << searchitem << " = " << "temp" << temp << endl;
                                 if (searchitem == name)
                                 {
                                     num = 1;
                                     cout << "Item is Found" << endl;
                                     cout << name<< " - " << price << endl;
                                     myfile.close();
                                     //remove("main.txt");
                                     //rename("temp.txt","main.txt");
                                     secondfile2.close();
                                     secondfile.close();
                                  
                                 }
                           }
                           }
                                   
              
    }   
    if(choice == 3)
    {
              num = 0;
              string item;
              ifstream tempfile("temp.txt");
              ifstream myfile("newitem.txt");
              ofstream secondfile("main.txt",ios::app);
              ifstream secondfile2("main.txt");
              ifstream ifs( "newitem.txt" );
              
              if (myfile.is_open() )
              {
                     vector<string> text_file;
                     string temp;
                     while( getline( secondfile2, temp ) )
                     {
                            string name,price;
                            istringstream liness(temp);
                            getline(liness, name, ' ');
                            getline(liness, price, ' ');
                            //cout <<"Item: " << name<< " - "<< "Price: " << price << endl;
                            
                          //cout << "rar" << temp << endl;
                          text_file.push_back( temp );
                          num = 0;
                          getline(myfile,item);
                         
                         //cout << "item" << item << " " << "temp" << temp << endl;
                   
                         if (item == temp)
                         {
                             num = 1;
                             cout << "The Store Already Has: " << item<<endl;
                             myfile.close();
                             //remove("main.txt");
                             //rename("temp.txt","main.txt");
                             secondfile2.close();
                             secondfile.close();
                          
                         }
                   }
                   secondfile2.close();
                   if(num == 0)
                   {
                      secondfile <<item<< endl;
                      secondfile.close();
                      cout << "Item Added" << endl;
                   }
                   myfile.close();
              }

              
              } 
              if(choice == 4)
    {
              num = 0;
              string item;
              ifstream tempfile("temp.txt");
              ifstream myfile("removeitem.txt");
              ofstream secondfile("main.txt",ios::app);
              ifstream secondfile2("main.txt");
              ifstream ifs( "removeitem.txt" );
              
              if (myfile.is_open() )
              {
                     vector<string> text_file;
                     string temp;
                     while( getline( secondfile2, temp ) )
                     {
                            string name,price;
                            istringstream liness(temp);
                            getline(liness, name, ' ');
                            getline(liness, price, ' ');
                            //cout <<"Item: " << name<< " - "<< "Price: " << price << endl;
                            
                          //cout << "rar" << temp << endl;
                          text_file.push_back( temp );
                          num = 0;
                          getline(myfile,item);
                         
                         //cout << "item" << item << " " << "temp" << temp << endl;
                   
                         if (item == temp)
                         {
                             num = 1;                             
                             cout << "Item Removed: " << item<<endl;
                             myfile.close();
                             remove("main.txt");
                             rename("temp.txt","main.txt");
                             cout <<"hehe"<<endl;
                          
                         }
                   }
                   secondfile2.close();
              }

              
              } 

    }

(its in Choice = 4)