/* Aviation program for Pilots

   Created by Harry Wheildon  */

using System;

class Avi {
  public static void Main() {

    char choice;
    char std;
    double speed;
    double distance;
    double time;
    // Insert future variables here

     for(;;) {
      do {              

	Console.WriteLine("Choose one from the list:");	
	Console.WriteLine("1.  Speed; Distance; Time");
	Console.WriteLine("2.  ISA Deviation");
        Console.WriteLine("3.  Time to Impact");
	Console.WriteLine("4.  Track Error; Closing Angle\n");
	Console.Write("Choose one (press Q to quit): ");
	do {
	  choice = (char) Console.Read();
        } while(choice == '\n' | choice == '\r');
      } while( choice < '1' | choice > '4' & choice != 'q');

      if(choice == 'q') break;

      Console.WriteLine("\n");

      switch(choice) {
	case '1':
	  Console.WriteLine("Here you can calculate the Speed, Distance or Time")
	  Console.WriteLine("Choose which one you want to calculate:")
	  Console.WriteLine("1.  Speed")
 	  Console.WriteLine("2.  Distance")
	  Console.WriteLine("3.  Time\n")
	  Console.Write("Choose one (press b to go back): ");
	  do {
	   std = (char) Console.Read();
	  } while(choice == '\n' | choice == '\r');
	} while( choice < '1' | choice > '3' & choice != 'b');

	if(choice == 'b') break;