public static void Main()
Console.WriteLine("==================================");
Console.WriteLine(" Manu ");
Console.WriteLine("==================================");
Console.WriteLine("Press c or C : Find Area of Circle");
Console.WriteLine("Press s or S : Find Area of Square");
Console.WriteLine("==================================");
Console.Write("Inpur your choice :");
ch = char.Parse(Console.ReadLine());
if (ch == 's' || ch == 'S')
Console.WriteLine("\nYou choose \"Square\" ");
Console.Write("Input width : ");
w = float.Parse(Console.ReadLine());
Console.Write("Input length : ");
l = float.Parse(Console.ReadLine());
else if (ch == 'c' || ch == 'C')
Console.WriteLine("\nYou choose \"Circle\" ");
Console.Write("Input radius : ");
r = float.Parse(Console.ReadLine());
Console.WriteLine("==================================");
Console.Write("Area = {0:n}\n",area);
Console.WriteLine("==================================");