public static void Main()
for (int i = 1; i <= end; i++)
Console.WriteLine("The product of the first {0} number is {1}", end, product);
for (int i = 1; i <= end; i++)
Console.WriteLine("The product of the first {0} number is {1}", end, product);
Console.WriteLine("The product of the first {0} number is {1}", end, product);
for (int i = m; i <= n; i++)
Console.WriteLine("Starting number: {0}, Ending number: {1}, The sum of numbers between {0} and {1} is {2}", m, n, sum);