如何获得最小的输入数字总和？

Question

I've got a task for printing the highest sum of numbers, lowest sum of numbers and the average of numbers which were printed. i managed to get the higest sum of numbers but with the lowest somehow didn't work for me at all.

for example: 7 3 -2 6 -10 8 -5 3 -2 1

their Interim amount: 7 10 8 14 4 12 7 10 8 9

the output will be:

Higest Interim amount: 14

Lowest Interim amount: 4

Avg of numbers: 0.9

my code:

static void Main(string[] args)
        {
            int num = 0, i, sum = 0, c = 0, max, min;
            max = min = num;
            for (i = 0; i <= 10; i++)
            {
                Console.WriteLine("Enter a number:");
                num = int.Parse(Console.ReadLine());
                sum = sum + num;
                if (sum >= max)
                    max = sum;
                else if (sum <= min)
                    min = sum;
                c++;
                Console.WriteLine("sum:{0}", sum);
            }
            Console.WriteLine("count={0} avg={1}", c, sum / (float)c);
            Console.WriteLine("Max:{0} Min:{1}", max, min);
        }

Answer 1

You make both min and max start at 0, so the min will only update if you get a negative value for the cumulative sum (which does not happen in your example). (Would be the same for the max value if all your sums remained negative).

You need to start with the numeric equivalent of min = +Infinity and max = -Infinity.

ie

static void Main(string[] args)
        {
            int num = 0, i, sum = 0, c = 0;
            int max = int.MinValue;
            int min = int.MaxValue;

(Thanks @Caius Jard for the syntax, I know nothing about C#)

Answer 2

It's because you set the initial min to 0, and then only set the minimum to the sum if it drops below that. If you set initial minimum and maximum to the first number input you won't have this problem:

static void Main(string[] args)
        {
            int num = 0, i, sum = 0, c = 0, max, min;
            for (i = 0; i <= 9; i++)
            {
                Console.WriteLine("Enter a number:");
                num = int.Parse(Console.ReadLine());
                if(i == 0)
                {
                     min = num;
                     max = num;
                }
                sum = sum + num;
                if (sum >= max)
                    max = sum;
                else if (sum <= min)
                    min = sum;
                c++;
                Console.WriteLine("sum:{0}", sum);
            }
            Console.WriteLine("count={0} avg={1}", c, sum / (float)c);
            Console.WriteLine("Max:{0} Min:{1}", max, min);
        }