Edit & Delete function

[Bmoynagh]

Hello everyone, My final project of the year is due tomorrow and i need to get this project finished and i am having trouble getting a delete and edit function for my code, could someone give me some assistance please

  #include <iostream>
#include <cstdlib>
#include <string>
#include <fstream>


using namespace std;

//declare variables
void Add();
void Edit();
void Display();
void Delete();

struct Inventory
{
    char name[35], address[25];
    int number;
    int age;
    int choice;
};

int main()
{
    int choice;
    do
    {
         cout << "MENU" << endl;
        cout<<"1) Add a Phone Record "<<endl;
        cout<<"2) Display Phone Records "<<endl;
        cout<<"3) Edit a Phone Record "<<endl;
        cout<<"4) Delete a Phone Record"<<endl;
        cout<<"5) Search a Phone Record"<<endl;
        cout<<"6) Exit "<<endl<<endl;
        cout<<"Please choose option:";
        cin >> choice;
        
        switch (choice)// change into an if else statement then turn into a function
        {
        case 1:
            Add();
            break;	//Add record
        case 2:
            Display();
            break;	//Display record
        case 3:
            Edit(); 
            break; //Edit Record
        case 4:
            Delete();
            break;   //Delete record

        default:
            cout << "Invalid Selection" << endl;
        }
    }
    while
    (choice <= 4);
    system("PAUSE");
    return 0;
}




//Add function
void Add()
{
    system("CLS"); //clears screen
    fstream fout;
    const int size = 3;
    char ch;
    int i = 0;
    fout.open("Records.txt", ios::out);
    Inventory inv;
    do
    {
        cout << "Enter Name: " << endl;
        cin.ignore();
        cin >> inv.name;
        cout << "Enter Address: " << endl;
        cin >> inv.address;
        cout << "Enter Number: " << endl;
        cin >> inv.number;
        cout << "Enter Age: " << endl;
        cin.ignore();
        cin >> inv.age;

//write record to file
        fout.write(reinterpret_cast<char*>(&inv), sizeof(inv));
        cout << "Do you want to add another record? " << endl;
        cin >> ch;
    }
      while
    (ch == 'Y' && 1 < 4);

//close the file
    fout.close();
}

//"Display" function
void Display()
{
    fstream fout;
    fout.open("Records.txt", ios::in);
    Inventory inv;
    fout.read(reinterpret_cast <char*> (&inv), sizeof(inv));
    while (!fout.eof())
    {

        cout << "\nName\t: ";
        cout << inv.name;
        cout << "\nAddress\t: ";
        cout << inv.address;
        cout << "\nNumber\t: ";
        cout << inv.number;
        cout << "\nAge\t: ";
        cout << inv.age;
        fout.read(reinterpret_cast <char*> (&inv), sizeof(inv));
    }
//close the file
    fout.close();
}

void Edit()
{


}


void Delete()