C#数组求和，该怎么处理

Question

如题所述

Answer 1

            int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
            int sum = 0;
            for (int i = 0; i < nums.Length; i++)
            {
                sum += nums[i];
            }
            Console.WriteLine(sum);
            Console.ReadKey();

Answer 2

using System.Linq;
int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int sum = nums.Sum();

Answer 3

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int[] num = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int sum = 0;
for (int i = 0; i < num.Length; i++)
{
sum += num[i];
}
Console.WriteLine(sum);
Console.ReadKey();

}

}
}