public static void Main()
String line="------------------------------------------------------------";
Console.Write("Input total price : ");
int price = int.Parse(Console.ReadLine());
Console.Write("Do you have coupon [y/Y] :");
char coupon = char.Parse(Console.ReadLine());
Console.WriteLine("{0}",line);
if (coupon == 'y' || coupon == 'Y' )
Console.Write("How many Discount (%) :");
int discount = int.Parse(Console.ReadLine());
int discounted = discount * price / 100;
Console.WriteLine("Discount from coupon ({0}%) = {1} Baht.",discount,discounted);
Console.Write("Net price = {0:N} Baht",price - discounted);
else if(coupon == 'n' || coupon == 'N' && price >= 2000)
int dis_pro = price * 10 / 100;
Console.WriteLine("Discount from promotion = {0} Baht.",dis_pro);
Console.Write("Net price = {0:N} Baht",price - dis_pro);
else if(coupon == 'n' || coupon == 'N' && price < 2000)
Console.Write("Net price = {0:N} Baht.",price);