public static void Main()
string line = "---------------------------------------------------------------------";
Console.Write("Input total price : ");
double price = double.Parse(Console.ReadLine());
Console.Write("Do you have coupon [y/Y] : ");
char choice = char.Parse(Console.ReadLine());
if (choice == 'y' || choice == 'Y' )
Console.Write("How many discount (%) : ");
double percent = double.Parse(Console.ReadLine());
double dc = (price*percent)/100;
Console.WriteLine("Discount from coupon : ({0}%) = {0:F} Baht",percent,dc);
Console.WriteLine("Net Price = {0:F} Baht",np);
else if (price >= 2000 && ( choice == 'n'||choice == 'N' ) )
double dc = (price*10)/100;
Console.WriteLine("Discount from promotion = {0:F} Baht",dc);
Console.WriteLine("Net Price = {0:F} Baht",np);
Console.WriteLine("Net Price = {0:F} Baht",price);