czC#02

1、out参数

out参数要求在方法的内部必须为其赋值

using System;
using System.Text;

namespace Demo
{

    class Program
    {
        //返回一个数组的最大值，最小值，均值，长度,名称

        static void Main()
        {
            int max = 0;
            int min = 0;
            int ave = 0;
            int len = 0;
            string name = "";
            int[] arr = { 1, 4, 10 };
            Test(arr, out max, out min, out ave, out len, out name);
            Console.WriteLine(max);
            Console.WriteLine(min);
            Console.WriteLine(ave);
            Console.WriteLine(len);
            Console.WriteLine(name);
            Console.ReadLine();

        }

        public static void Test(int[] arr,out int max, out int min, out int ave, out int len, out string name)
        {
            //伪代码
            max = 10;
            min = 1;
            ave = 5;
            len = 3;
            name = "arr";
        }
    }

}

2、ref参数

值传递时，原值也会改变

using System;
using System.Text;

namespace Demo
{

    class Program
    {

        static void Main()
        {
            int num = 10;
            Test(ref num);
            Console.WriteLine(num);
            Console.ReadLine();

        }

        public static void Test(ref int num)
        {
            num += 10;
        }
    }

}

3. params可变参数

参数列表变为数组，方法执行时数组内的元素不可改变

using System;
using System.Text;

namespace Demo
{

    class Program
    {

        static void Main()
        {
            Console.WriteLine(Test("Linda", 100, 90, 98, 94));
            Console.ReadLine();

        }

        public static int Test(string name,params int[] score)
        {
            return score[0];
        }
    }

}