using System;

public class Program

{

    public static void Main()

    { Console.WriteLine("C H O I C E");

    Console.WriteLine("1  Calculate distance between two coordinates.");

        Console.WriteLine("2  Calculate the midpoint.");

        Console.WriteLine("3 Calculate the slope through two coordinates");

        double Distance =0; 

      double MP1=0;

      double MP2=0;

        double slope=0;

     int C=0;

     int IC=0;

    double x =0;    

      { Console.WriteLine("How many questions you want to check ?"); 

     int q = Convert.ToInt32(Console.ReadLine());

            { Console.WriteLine("Enter the coordinates x1, x2, y1, y2.");

        double x1= Convert.ToInt32(Console.ReadLine());

        double x2= Convert.ToInt32(Console.ReadLine());

        double y1= Convert.ToInt32(Console.ReadLine());

         double y2= Convert.ToInt32(Console.ReadLine());

             int count =0;

             { 

             do {

            Console.WriteLine("Enter your choice (1,2,3)");

             int choice= Convert.ToInt32(Console.ReadLine()); 

            if  (choice == 1) { {

     x=((x1-x2)*(x1-x2)+(y2-y1)*(y2-y1));

                Distance = Math.Sqrt(x);

            count = count+1;

             Console.WriteLine(Distance);

            Console.WriteLine("Is the answer verified ? Yes/No");

            string ans = Console.ReadLine();

            if  (ans == "Yes")

            C=C+1; 

            else IC=IC+1; } }

            if  (choice==2){ {

        MP1= (x1+x2)/2;

     MP2= (y1+y2)/2;

            count = count+1;

            Console.WriteLine("The first coordinate of the midpoint is :" + MP1 ); Console.WriteLine("The second coordinate of midpoint is :" + MP2);

        Console.WriteLine("Is the answer verified ?");

            string ans = Console.ReadLine();

            if (ans == "Yes") 

            C=C+1; 

            else IC=IC+1; }}

             if (choice==3)

            { 

        slope = ((y2-y1)/(x2-x1));

            count = count+1;

             Console.WriteLine(slope);

     Console.WriteLine("Is the answer verified ?");

            string ans = Console.ReadLine();

            if  (ans == "Yes") 

            C=C+1; 

            else IC=IC+1; } 

             }  while(count != q);} 

     Console.WriteLine("Number of  right answers is"+" " + C);

     Console.WriteLine("Number of incorrect answers "+IC);

     double per = 0; 

     per = ((C*5)/(q*5))*100; 

     Console.WriteLine("Percentage "+ per);} }

} }