#include <iostream> // standard input/output library
#include <cstdlib> // for abs function
using namespace std;

int main()
{
	//constant values for the deviations in the writeup
	const int RANGEONE = 1;
	const int RANGETWO = 2;
	const int RANGETHREE = 3;
	const int RANGEFOUR = 4;
    const int RANGEFIVE = 6;
	const int RANGESIX = 8;
	const int RANGESEVEN = 13;
	        

	int actualtime; // actual flight time, as input by the user
	int expectedtime; //expected flight time as input by user
	int deviation; // deviation as outlined in writeup

	// write the opening header
	cout << "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=" << endl;
	cout << "Welcome to the Moose and Squirrel Airlines" << endl;
	cout << "Flight Time Calculation Program." << endl;
	cout << "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=" << endl;

	// user input for expected flight time
	cout << "Please enter your expected flight time -> ";
	cin >> expectedtime;
	// user input for expected flight time
	cout << "Please enter your actual flight time -> ";
	cin >> actualtime;



	if (expectedtime || actualtime <= 0)
		{
		cout << "You have input an invalid flight time." << endl;
		}

	// setting deviations for any given range

	

	if (expectedtime <= RANGEONE)
	{
		deviation = 1;
	}
	else if 
	
		(expectedtime <= RANGETWO)
	{
		deviation = 2;
	}
	else if 
	
		(expectedtime <= RANGETHREE)
	{
		deviation = 3;
	}
	else if 
	
		(expectedtime <= RANGEFOUR)
	{
		deviation = 4;
	}
	else if 
	
		(expectedtime <= RANGEFIVE)
	{
		deviation = 6;
	}
	else if 
	
		(expectedtime <= RANGESIX)
	{
		deviation = 8;
	}
	else if 
	
		(expectedtime <= RANGESEVEN)
	{
		deviation = 13;
	}
	else if
		(expectedtime >= RANGESEVEN)
	{
		deviation = 17;
	}
	

	
	

		// perform calculation for acceptability
	if (abs (expectedtime - actualtime) == deviation)
		{
		cout << "This flight time is acceptable." << endl;
		}
	else cout <<"This flight time is unacceptable." << endl;

	cout << "Thank you for using the Moose and Squirrel Airlines" << endl;
	cout << "Flight Time Calculator." << endl;


return(0);
}