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;

    double C=0;  int IC=0;

    double x =0;    

    int count =0;

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

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

     { do {

     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());

     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("The distance is  " + 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 midpoint is : " + MP1);

  Console.WriteLine("The second midpoint is : " + MP2);

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

  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("The slope is " + slope);

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

  string ans = Console.ReadLine();

  if  (ans == "Yes") 

  C=C+1; 

  else IC=IC+1; } 

             }  while(count != q);} 

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

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

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

  Console.WriteLine("Percentage "+ per);

} }}