How do i list the last 6 recent transactions?

[DriftKing13]

This is the piece of code that I am struggling on, I want the case 2 to be able to read in the last 6 recent transactions but not from the text file they are recorded on, when I run case 1 and withdraw an amount, this creates a timestamp in "TransList.txt", case 2 If pressed needs to show the last 6 recent transactions I made using case 1, any help here guys?

#include <fstream>
#include <cstring>
#include <string>
#include <iostream>
#include <ctime>
#include <iomanip>

using namespace std;

int main(int argc, char *argv[]) {

	const string user= "dan123";
	const string pass = "password";
	const string accnum = "2364288";
	string entnum;
	string entpass;
	int inputted;
	int portbalance;
	string translist;
	int attempts = 0;
	int attempt = 0;
	int subtramount;
	time_t now = time(0);
	char* dt = ctime(&now);


	fstream bank;
	fstream transactions;

	bank.open("PortAccount.txt");
	transactions.open("TransList.txt", ios::app);


	cout << "Welcome to Port Wage Manager v1.2" << endl;
	cout << "Please enter your account number : " << endl;
	cin >> entnum;

	while (entnum !=accnum && attempt < 3)
	{
		cout << "Account number incorrect try again: " << endl;
		cin >> entnum;
		attempt++;
	}

	if (attempt < 3)
	{
		cout << "User Identified, Welcome " << user << endl;
	}
	else
	{
		cout << "All attempts failed, system will now close" << endl;

		system("Pause");

		return 0;
	}

	cout << "Please enter password " << user << endl;
	cout << "Enter here" << endl;
	cin >> entpass;

	while (entpass !=pass && attempts < 3)
	{
		cout << "Access Failed try again: " << endl;
		cin >> entpass;
		attempts++;
	}

	if (attempts < 3)
	{
		cout << "Access Granted ";
	}
	else
	{
		cout << "Three attempts failed, system will now shut down" << endl;

		system("Pause");

		return 0;
	}

	do
	{

		system("cls");

		bank >> portbalance;

		cout << "Account Balance is = " << portbalance << endl << endl;

		cout << "Enter 1 for Bank Transfer" << endl;
		cout << "Enter 2 to display last 5 transactions" << endl;
		cout << "Enter 3 to display account details" << endl;
		cout << "Enter 4 to exit program" << endl;


		cin >> inputted;

		if (inputted > 4)
		{
			cout << "Only enter values 1 to 4" << endl;
		}



		switch (inputted)	
		{
		case 1:
			cout << "How much do you want to withdraw? : " <<  endl;
			cin >> subtramount;

			transactions << " -" << subtramount << setw(5) << " User: " << user << setw(5) << dt;

			cout << "Transaction successful, you withdrew " << subtramount << " GBP at " << dt << endl;

			portbalance = portbalance - subtramount;

			if (portbalance <= 0)
			{
				cout << "Error, withdrawal cancelled, you have insufficient funds" << endl;

				transactions << "Withdrawal attempt cancelled for " << setw(3) << subtramount << "at " << dt; 

				break;
			}

			cout << "Your balance is " << portbalance << endl;

			{
				ofstream bank;
				bank.open ("PortAccount.txt");
				bank << portbalance;
				bank.close();
			}


			break;

		case 2:

			transactions.open("TransList.txt");

			cout << "your last six transactions are " << endl << endl;



			break;
		case 3:

			cout << "The current balance is " << portbalance << endl;
			cout << "Account name: " << user << endl;
			cout << "Account number: " << accnum << endl << endl;
			break;

		case 4:

			cout << "System will now shut down, Goodbye " << user << endl;

			system("pause");

			return 0;
		}


	} while (inputted!=4);





	bank.close();
	transactions.close();


	cin.get();
	cin.ignore();
	return 0;


}	

[mutexe]

you'll need to keep a track of transactions in a collection like a vector.
how many pieces of information does one transaction entail? is it just a number? or a number and a date? or something else?

edit: another thing. When you print out your balance for the first time:
cout << "Account Balance is = " << portbalance << endl << endl;

That's going to print out rubbish because you have not initialised 'portbalance'.

this will also cause all of your calculations under case 1 to be wrong too.