cont. Help...

I gave some thought to what was mention and this is what i came up with ->

Code:

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#include <iostream>
#include <iomanip>
using namespace std;

const double INT = 0.10;

int main()
{
        int years=0, x=0;
        double P0=0, Px=0, P1=0, interest=0;

        cout << fixed << showpoint;
        cout << setprecision(2);

        cout << "Program that reads an initial amount and computes "
                << "the total in the account on your sixtieth birthday." << endl << endl;

        cout << "Enter the initial amount of the account -> ";
        cin >> P0;

        Px = P0;

        cout << "Enter the amount of years the account remain untouch -> ";
        cin >> years;
       
        cout << endl << endl;
        cout << "The initial investment was $" << P0 << " . The total amount accumulated after "
                << years <<" years, if $" << P0 << " is allowed to compound with an interest of 10.00%,"
                << "comes to $";
       
        for (x = 0; x != years; x++)
                {
                        P1 = P0 + ( P0 * INT);

                        while (P0 < P1)
                                P0 = P1;
                }
        cout << P1 <<'.' << endl << endl;
        cout << "The total amount accumulated after " << years << " (years + 1) years,"
                <<" if $" << Px << " is allowed to compound with an interest of 10%, comes to $";
       
        years += 1;

        for (x = 0; x != years; x++)
                {
                        if (x == years - 1)
                                interest += (Px * INT);       
                        P1 = Px + ( Px * INT);

                        while (Px < P1)
                                Px = P1;
                }

        cout << P1 << " ." << endl << endl;
        cout << "The interest earned during this year is $" << interest
                << ".If interest is withdrawn each year thereafter, my income is $"
                << (P0 / 12) << " per month." << endl << endl;

                return 0;
}

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I was wondering it anyone can make any comment or mention anyways of improving the program to make it more efficient.
THANKZ :D