C#的几个知识点

int[] nums = new int[] { 98, 54, 322, 43, 23 };
int temp = 0;
for (int j = 0; j < nums.Length - 1; j++)
{
for (int i = 0; i < nums.Length-1-j; i++)
{
if (nums[i]>nums[i+1])  // >是从小到大排序；<是从大到小排序
{
temp = nums[i];
nums[i] = nums[i + 1];
nums[i + 1] = temp;
}
}
}
for (int i = 0; i < nums.Length; i++)
{
Console.WriteLine(nums[i]+"\t");
}
Console.ReadKey();

//正常排序
int[] nums = new int[] { 2, 13, 45, 53 };
Array.Sort(nums); //排序，从小到大
Array.Reverse(nums);//这个方法是反转，使用则变成从大到小排序
for (int i = 0; i < nums.Length; i++)
{
Console.Write(nums[i]+"\t");
}
//for (int i = length - 1; i >= 0; i--)//反转，快捷键forr
//{
//Console.Write(nums[i]+"\t");
//}
Console.ReadKey();

namespace _04_计算一个整数数组的所有元素的和
{
class Program
{
static void Main(string[] args)
{
int[] numbers = new int[] { 1, 2, 3, 4, 5 };
Program.SumArray(numbers);
Console.ReadKey();
}
public static void SumArray(int[] nums)
{
int sum = 0;
for (int i = 0; i < nums.Length; i++)
{
sum+=nums[i];
}
Console.WriteLine("和为{0}",sum);
}
}
}