Bank transfer using friend function

#include <iostream>
using namespace std;
class bank
{
public:
    double id, id1;
    double money, money1;
    double acc, acc1, m, t, t1;
    friend int data(bank);
    friend int data1(bank);
};
int data(bank i)
{
    cout << "Enter HDFC account number please: ";
    cin >> i.acc;
    if (i.id1 == i.acc)
    {
        cout << "[your account number is match]";
        cout << "\nEnter money to transfer: ";
        cin >> i.m;
        if (i.m <= i.money)
        {
            cout << "[Money has been successfully transfer]\n";
            i.t = i.money - i.m;
            cout << "-----------------SBI DETAIL---------------\n";
            cout << "SBI Account No |" << i.id << endl
                 << "Previous Balance |" << i.money << endl;
            cout << "Transfered Money |" << i.m << endl
                 << "Available Balance |" << i.t << endl;
            cout << "--------------------------------------------\n";
            i.t = i.money1 + i.m;
            cout << "-----------------HDFC DETAIL----------------\n";
            cout << "HDFC Account No |" << i.id1 << endl
                 << "Previous Balance |" << i.money1 << endl;
            cout << "Received Money |" << i.m << endl
                 << "Available Balance |" << i.t << endl;
            cout << "--------------------------------------------\n";
        }
        else
        {
            cout << "That Much Money not available in your account\n";
        }
    }
    else
    {
        cout << "Enter valid account number\n";
    }
}
int data1(bank i)
{
    cout << "Enter SBI account number please\n";
    cin >> i.acc;
    if (i.id == i.acc)
    {
        cout << "[your account number is match]\n";
        cout << "Enter money to transfer \n";
        cin >> i.m;
        if (i.m <= i.money1)
        {
            cout << "[Money has been successfully transfer]\n";
            i.t1 = i.money1 - i.m;
            cout << "-----------------HDFC DETAIL----------------\n";
            cout << "HDFC Account No |" << i.id1 << endl
                 << "Previous Balance |" << i.money1 << endl;
            cout << "Transfered Money |" << i.m << endl
                 << "Available Balance |" << i.t1 << endl;
            cout << "--------------------------------------------\n";
            i.t1 = i.money + i.m;
            cout << "-----------------SBI DETAIL---------------\n";
            cout << "SBI Account No |" << i.id << endl
                 << "Previous Balance |" << i.money << endl;
            cout << "Received Money |" << i.m << endl
                 << "Available Balance |" << i.t1 << endl;
            cout << "--------------------------------------------\n";
        }
        else
        {
            cout << "That Much Money not available in your account\n";
        }
    }
    else
    {
        cout << "Enter valid account number\n";
    }
}
int main()
{
    bank i;
    cout << "Set account number for SBI: ";
    cin >> i.id;
    cout << "\nEnter money in SBI bank account: ";
    cin >> i.money;
    cout << "\nSet account number for HDFC: ";
    cin >> i.id1;
    cout << "\nEnter money in HDFC bank account: ";
    cin >> i.money1;
    cout << "-------------------------\n";
    cout << "SBI Account No |" << i.id << endl
         << "Available Balance |" << i.money << endl;
    cout << "HDFC Account No |" << i.id1 << endl
         << "Available Balance |" << i.money1 << endl;
    cout << "-------------------------\n";
    int ch;
    cout << "\n1.SBI to HDFC\n";
    cout << "2.HDFC to SBI\n";
    cout << "Select Bank to transfer money: ";
    cin >> ch;
    switch (ch)
    {
    case 1:
        data(i);
        break;
    case 2:
        data1(i);
        break;
    }
}