bank.cpp

#include <iostream>
#include <string>
#include <vector>

using namespace std;

class account {
private:
    string name;
    static int accno_counter;
    int accno;
    string phone;
    float balance;
    int pin;

public:
    account() {}
    account(int a, string n, string ph, int p, float b) {
        accno = a;
        name = n;
        phone = ph;
        pin = p;
        balance = b;
    }

    void makeaccount(vector<account>& accounts) {
        accno_counter++;
        accno = accno_counter;
        cout << "enter accountholder name :\n";
        cin >> name;
        cout << "enter your phone number (10 digits):\n";
        cin >> phone;
        if(phone.length() != 10 || phone.find_first_not_of("0123456789") != string::npos) {
            cout << "not a valid phone number\n";
            return;
        }
        cout << "phone number is : " << phone << "\n";
        cout << "enter a 4-digit pin: \n";
        cin >> pin;
        if(pin<1000 || pin>9999) {
            cout << "invalid pin... \n";
            return;
        }
        int againpin;
        cout << "enter pin again to confirm: \n";
        cin >> againpin;
        if(againpin != pin) {
            cout << "pins do not match...\n";
            return;
        } else {
            cout << "your pin is saved\n";
        }
        cout << "enter initial balance:\n";
        cin >> balance;
        if(balance<0) {
            cout << "invalid balance\n";
            return;
        }
        cout << "account created successfully\n";
        cout << "your account number is : " << accno << "\n";
        accounts.push_back(*this);
    }

    void withdraw(vector<account>& accounts) {
        cout << "enter amount:\n";
        float amount;
        cin >> amount;

        if(amount>0 && amount<balance) {
            balance -= amount;
            cout << "now your balance is after withdrew :\n" << balance;
            cout << "successfully done\n";
        } else {
            cout << "enter a valid amount\n";
        }
        accounts.push_back(*this);
    }

    void deposit(vector<account>& accounts) {
        cout << "enter amount:"<<"\n";
        float amount;
        cin >> amount;

        if(amount>0) {
            balance += amount;
            cout << "successfully done deposit \n";
            cout << "now your balance is :" << balance<<"\n";
        } else {
            cout << "enter a valid amount\n";
        }
    }

    void display(vector<account>& accounts) {
        cout << "account holder name:  " << name << "\n";
        cout << "account number:  " << accno << "\n";
        cout << "your current balance is:  " << balance << "\n";
        cout << "phone number:  " << phone << "\n";
        cout << "pin:  " << pin << "\n";
    }

    

    void transfer(vector<account>& accounts) {
        cout << "enter amount to transfer:\n";
        float amount;
        cin >> amount;

        cout << "enter account number to transfer to:\n";
        int to_accno;
        cin >> to_accno;

        
        account* to_account = nullptr;
        for (auto& acc : accounts) {
            if (acc.accno == to_accno) {
                to_account = &acc;
                break;
            }
        }

        if (!to_account) {
            cout << "Destination account not found.\n";
            return;
        }

        if (amount > 0 && amount < balance) {
            balance -= amount;
            to_account->balance += amount;
            cout << "Successfully transferred\n";
        } else {
            cout << "Enter a valid amount\n";
        }
    }

    void deleteaccount(vector<account>& accounts){
        
        cout<<"HAHAHA ABHI BAKI HAII ";
        //cout << "Account not found or already deleted\n";
    }

     friend account* verifyuser(vector<account>& accounts);
};

account* verifyuser(vector<account>& accounts) {
        cout << "enter account number:\n";
        int acc_no;
        cin >> acc_no;
        cout << "enter pin:\n";
        int p;
        cin >> p;
        for (auto &acc : accounts) {
            if (acc.accno == acc_no && acc.pin == p) {
                cout << "User verified!\n";
                return &acc;
            }
        }
        cout << "Invalid account number or pin.\n";
        return nullptr;
    }

int account::accno_counter = 0;

vector<account> accounts;

int main() {
    //accounts.push_back(account(101, "disha", "9876543210", 1234, 5000));
   // accounts.push_back(account(102, "dish", "1234567890", 5678, 3000));

    do{
    cout << " 1 : make new account \n";
    cout << " 2 : withdraw amount \n";
    cout << " 3 : deposit amount \n";
    cout << "4 : trensfer amount \n";
    cout << "5 : delete account \n";
    cout << "6 : display account details \n";

    int choice;
    cin >> choice;
    if(choice == 1) {
        account a1;
        a1.makeaccount(accounts);
    } else if(choice == 2) {
        account* user = verifyuser(accounts);
        if(user) {
            user->withdraw(accounts);
        }
    }else if(choice==3){
        account* user= verifyuser(accounts);
        if(user){
            user->deposit(accounts);
        }
    }else if(choice==4){
        account* user = verifyuser(accounts);
        if(user){
            user->transfer(accounts);
        }

    }else if(choice==5){
        account* user= verifyuser(accounts);
        if(user){
            user->deleteaccount(accounts);
        }
    }else if(choice==6){
        account* user= verifyuser(accounts);
        if(user){
            user->display(accounts);
        }
    }else {
        cout<<"exit\n";

    } } while(true);
    return 0;
}