primary-no-array-creation expression [expression]

// compile with: /unsafe

class Pointers
{
    unsafe static void Main() 
    {
        char* charPointer = stackalloc char[123];

        for (int i = 65; i < 123; i++)
        {
            charPointer[i] = (char)i;
        }

        // Print uppercase letters:
        System.Console.WriteLine("Uppercase letters:");
        for (int i = 65; i < 91; i++)
        {
            System.Console.Write(charPointer[i]);
        }
        System.Console.WriteLine();

        // Print lowercase letters:
        System.Console.WriteLine("Lowercase letters:");
        for (int i = 97; i < 123; i++)
        {
            System.Console.Write(charPointer[i]);
        }
    }
}