arrays

// 1
            //Console.WriteLine("Enter 2 positive numbers");
            //int a = int.Parse(Console.ReadLine());
            //int b = int.Parse(Console.ReadLine());
            //int[] nums = new int[b];
            //Console.WriteLine("Enter list of numbers");
            //int sum = 0;
            //for (int i = 0; sum <= a && i != b; i++)
            //{
            //  nums[i] = int.Parse(Console.ReadLine());
            //  sum = sum + nums[i];
            //}
            //Console.WriteLine("The sum is: " + sum);

            // 2
            //int[] nums = new int[10];
            //nums[0] = int.Parse(Console.ReadLine());
            //nums[1] = int.Parse(Console.ReadLine());
            //for (int i = 2; i < nums.Length; i++)
            //{
            //  int sum = 0;
            //  sum = sum + nums[i - 1] + nums[i - 2];
            //  nums[i] = sum;
            //}
            //Console.WriteLine("the numbers are");
            //for (int i = 0; i < nums.Length; i++)
            //{
            //  Console.Write(nums[i] + ", ");
            //}

            // 3
            //Console.WriteLine("Enter numbers");
            //int[] days = new int[7];
            //int[] tickets = new int[7];
            //int sum = 0;
            //for (int i = 0; i < 7; i++)
            //{
            //  days[i] = int.Parse(Console.ReadLine());
            //  tickets[i] = int.Parse(Console.ReadLine());
            //  sum = sum + tickets[i];
            //}
            //int most = tickets[0], least = tickets[0];
            //int m = days[0], l = days[0];
            //for (int i = 0; i < 7; i++)
            //{
            //  if (tickets[i] > most)
            //      m = days[i];
            //  if (tickets[i] < least)
            //      l = days[i];
            //}
            //Console.WriteLine("Total tickets: " + sum);
            //Console.WriteLine("Most tickets in day " + m);
            //Console.WriteLine("Least tickets in day " + l);

            // 4
            int[] set1 = new int[6];
            int[] set2 = new int[6];
            Console.WriteLine("Enter first 6 numbers");
            for (int i = 0; i < set1.Length; i++)
            {
                set1[i] = int.Parse(Console.ReadLine());
            }
            Console.WriteLine("Enter next 6 numbers");
            for (int i = 0; i < set2.Length; i++)
            {
                set2[i] = int.Parse(Console.ReadLine());
            }
            int[] difference = new int[6];
            for (int i = 0; i < 6; i++)
            {
                int r = 0;
                for (int j = 0; j < 6; j++)
                {
                    if (set1[i] != set2[j])
                        r++;
                }
                if (r == 6)
                    difference[i] = set1[i];
            }
            int count = 0;
            Console.WriteLine("Set difference is:");
            for (int i = 0; i < 6; i++)
            {
                if (difference[i] == 0)
                    count++;
                else
                    Console.Write(difference[i] + ", ");
            }
            if (count == 6)
                Console.WriteLine("empty");