using System;

public class Program

{

    public static void Main()

    {

        String firstName;// Save first name

        String lastName;// Save last name

        String letterGrade = "";// Save letter grade

        Double YearOfBirth = 0;// Save 0 in year of birth

        Double testScore = 0;//Save 0 in test score 

        Double YearsOld = 0;// Save 0 in years old

         Console.WriteLine("What is your first name ?");// Prompt user for first name

         firstName = Console.ReadLine();//Write "FirstName is "

        Console.WriteLine("What is your last name?"); // Prompt user for last name

        lastName = Console.ReadLine();// Write "LastName is "

        Console.WriteLine("What year where you born?");// Prompt user for year of birth

        YearOfBirth = double.Parse(Console.ReadLine());//Write " Year of birth is "

        Console.WriteLine("What is your test score?");// Prompt user for test score

        testScore = double.Parse(Console.ReadLine());// Write "test score is "

        YearsOld = 2018 - YearOfBirth;// Calculate years old with current year subtracted by user year of birth

        if(testScore >= 90)// Test grade equal or above 90 is an A

        {

            letterGrade = "A";

        }

        if(89 >= testScore &&  testScore >= 80)

        {

            letterGrade = "B";

        }

        if(79 >= testScore && testScore >= 70)

        {

            letterGrade = "C";

        }

        if(69 >= testScore && testScore >= 60)

        {

            letterGrade = "D";

        }

    Console.WriteLine(firstName + " " + lastName + " is " + YearsOld + " in 2018 ");// displays user age

    Console.WriteLine(firstName + " " + " has a test score of " +  letterGrade);

    }

}