#include <iostream>
#include <iomanip>
#include <string>

using namespace std;

  const double safe = 0.00;
  const double someImpairment = 0.04;
  const double significantAffected = 0.08;
  const double someCriminalPenalties = 0.10;
  const double deathPossible = 0.30;
  const string SAFE = "Safe To Drive";
  const string SOMEIMPAIR = "Some Impairment";
  const string SIGNIFICANT = "Driving Skills Significantly Affected";
  const string MOST_STATES = "Criminal Penalties in Most US States";
  const string ALL_STATES = "Legally Intoxicated - Criminal Penalties in All US States";
  const string YOURE_DEAD = "Death is Possible!";

void computeBloodAlcoholConcentration(int numDrinks, int weight, int duration, double &maleBAC, double &femaleBAC)
{
	double maleBAC_CONSTANT = 3.8;
	double femaleBAC_CONSTANT = 4.5;
	maleBAC = (((double)numDrinks / (double)weight) * maleBAC_CONSTANT - (((double)duration / 40) * 0.01));
	femaleBAC = (((double)numDrinks / (double)weight) * femaleBAC_CONSTANT - (((double)duration / 40) * 0.01));
	if (maleBAC < 0)
		maleBAC = 0;
	if (femaleBAC < 0)
		femaleBAC = 0;
}

string impairment(double bac)
{
	double BAC = bac;
  if (BAC <= safe)
	  return SAFE;
  else if (BAC < someImpairment)
	  return SOMEIMPAIR;
  else if (BAC < significantAffected)
	  return SIGNIFICANT;
  else if (BAC < someCriminalPenalties)
	  return MOST_STATES;
  else if (BAC <= deathPossible)
	  return ALL_STATES;
  else
	  return YOURE_DEAD;
}

int promptForInteger(string const &message, int lower, int upper)
{
	int x;
	cout << endl << message << endl;

	cout << "Lower?" << endl;
	cin >> lower;
	cout << "Upper?" << endl;
	cin >> upper;
	do
	{
		cout << "Enter a number within range: ";
		cin >> x;
	} while(x < lower || x > upper);
	return x;
}

char promptForMorF(string const &message)
{
	char gender;
	cout << message << endl;
	do
	{
		cout << "M/F?" << endl;
		cin >> gender;
	} while(gender != 'M' && gender != 'F');
	return gender;
}

int main()
{
	double genderconstant, maleBAC = 0, femaleBAC = 0, bac;
	int numDrinks, weight, duration;
	string message;
	cout << "Number of drinks?" << endl;
	cin >> numDrinks;
	cout << "Weight in pounds?" << endl;
	cin >> weight;
	cout << "Duration in minutes?" << endl;
	cin >> duration;
//	cout << "Gender? M/F" << endl;
//	cin >> gender;
//	if (gender == 'M' || gender == 'm')
//		femaleBAC = 0;
//	else
//		maleBAC = 0;
	computeBloodAlcoholConcentration(numDrinks, weight, duration, maleBAC, femaleBAC);
	cout << "Male BAC is " << maleBAC << endl;
	cout << "Female BAC is " << femaleBAC << endl;
	bac = maleBAC;
	promptForInteger(impairment(bac), 0, 0);
	promptForMorF(impairment(bac));
	return 0;
}