public static void Main()
Console.WriteLine("Enter integer A");
int A=int.Parse(Console.ReadLine());
Console.WriteLine("Enter integer B");
int B=int.Parse(Console.ReadLine());
Console.WriteLine("Enter integer C");
int C=int.Parse(Console.ReadLine());
Console.WriteLine("Enter integer D");
int D=int.Parse(Console.ReadLine());
Console.WriteLine("total sum of the four integer is {0}",sum);
Console.WriteLine("The average of the four integers is{0:f2}",average);