// This program will prompt for an individual's daily miles driven and their auto's mpg. 
// It will then calculate how much it will cost the person for gas to drive their car for a week.

#include <iostream>
using namespace std;

double Weekly_Cost(int miles, double mpg);  // function prototype

int main()
{
	int daily_miles; 
	double cost, auto_mpg;

	cout << "Please enter your daily miles and mpg " << endl;
	cin >> daily_miles >> auto_mpg;

	cost = Weekly_Cost(daily_miles, auto_mpg);

	cout << endl << " If you drive your car " << daily_miles << " miles per day "
		 << "and your car's mpg is " << auto_mpg << endl;
	cout << " you can expect to pay " << cost
		 << " dollars for gas at $3.85 per gallon. " << endl<< endl;
}

// calculate the weekly cost of driving your car and return that value to the calling fnct.
double Weekly_Cost( int miles, double mpg)
{
	double weekly_cost;
	weekly_cost = ((miles * 7) / mpg) * 3.85;
	return weekly_cost;
}