#include <iostream>
using namespace std;

float home (float g) // home function
{
    float cost;
    cost = 5+(0.0005 * g);
    return (cost);
}
float com (float g) // commercial function
{
    float cost;
    if (g < 4000000)
    {
        cost = 1000;
    }
    else
    {
        cost = 1000 + (0.00025 * (g - 4000000));
    }
    return (cost);
}
float ind (float g) //industrial function
{
    float cost;
    if (g < 4000000)
    {
        cost = 1000;
    }
    else if (g > 4000000 && g < 10000000)
    {
        cost = 2000;
    }
    else
    {
        cost = 3000;
    }
    return (cost);
}

int main()
{
    int account;
    char type = 0;
    float g, cost;
    cout << "Please input your account number: \n";
    cin >> account;
    cout << "Please enter your usage in gallons.\n";
    cin >> g;
    cout << "Now please enter your account type.\nType h for home, c for commercial, or i for industrial.\nThanks!\n";
    do {
        cin >> type;
        if (type == 'h'){ break; }
        if (type == 'c'){ break; }
        if (type == 'i'){ break; }

    } while (type == 0);


    if (type == 'h')
    {
        cost = home (g);
    }
    else if(type == 'c')
    {
        cost = com (g);
    }
    else
    {
        cost = ind (g);
    }

    cout << "Hi " << account << ", your fee is: $" << cost << endl;
    return 0;
}