using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Welcome to the derivative/integral taker program!\nThe purpose of this program is to take the derivative of a linear equation to find it's curvature at a point, or to take the integral of a linear equation to find the area under the curve!");

        Console.WriteLine("\nWould you like to take a derivative (D) or an integral (I)?");

        string dori = Console.ReadLine();

        string DReply = ("What is the number in you linear equation prior to the variable? (_x^N+Y)");

        string IReply = ("What is the number in you linear equation prior to the variable? (∫(_x^Z)dx)");

        string doriother = ("The response you typed does not exist. Only D and I are allowed replies. (Both capital)");

        string DExponent= ("What power is you variable rasied to? (Zx^_+Y)");

        string DAddition = ("What constant is added to the equation? (Zx^N+_)");

        string IExponent= ("What power is you variable raised to? (∫(Yx^_)dx)");

            if (dori == "D")

            {

                Console.WriteLine(DReply);

                string Danswer1 = Console.ReadLine();

                decimal Numanswer1 = Int32.Parse(Danswer1);

                Console.WriteLine(DExponent);

                string Danswer2 = Console.ReadLine();

                decimal Numanswer2 = Int32.Parse(Danswer2);

                Console.WriteLine(DAddition);

                string DAnswer3 = Console.ReadLine();

                decimal Numanswer3 = Int32.Parse(DAnswer3);

                decimal One = (Numanswer1 * Numanswer2);

                decimal Two = (Numanswer2 - 1);

                string FinalAnswer = (One + "x^" + Two);

                Console.WriteLine("\nThe derivative of " + Numanswer1 + "x^" + Numanswer2 + "+" + Numanswer3 + " is\n" + FinalAnswer);

            }

            else if (dori == "I")

            {

                Console.WriteLine(IReply);

                string Danswer1 = Console.ReadLine();

                decimal Numanswer1 = Int32.Parse(Danswer1);

                Console.WriteLine(IExponent);

                string Danswer2 = Console.ReadLine();

                decimal Numanswer2 = Int32.Parse(Danswer2);

                decimal Zero = (Numanswer2 + 1);

                decimal One = (Numanswer1 / Zero);

                string FinalAnswer = (One + "x^" + Zero + " + c");

                Console.WriteLine("\nThe integral of (∫(" + Numanswer1 + "x^" + Numanswer2 + ")dx) is\n" + FinalAnswer);

            }

            else 

            {

                Console.WriteLine(doriother);

            }

    }

}