.NET基礎之C#函式
阿新 • • 發佈:2018-11-16
int[] data = {0, 5, 2, 6, 3, 4};
Array.Sort(data);//陣列升序
Array.Reverse(data);//陣列反轉
//陣列升序後再反轉,則實現陣列降序
out引數的使用
注:out修飾的引數在定義時可以不賦初值,但在函式中必須賦值
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { int max; int min; int avg; int[] data = { 1, 2, 6, 7, 3 }; Test(data, out max, out min, out avg); Console.WriteLine("max = {0}\nmin = {1}\navg = {0}", max, min, avg); } public static void Test(int[] num, out int max, out int min, out int avg) { max = num[0]; min = num[0]; int sum = 0; for (int i = 0; i < num.Length; i++) { if (max < num[i]) max = num[i]; if (min > num[i]) min = num[i]; sum += num[i]; } avg = sum / num.Length; } } }
ref引數的使用
注:ref修飾的引數在定義時必須賦初值,在函式中可以不賦值
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { int x = 1; int y = 2; Change(ref x, ref y); Console.WriteLine("x = {0}, y = {1}", x, y); Console.ReadKey(); } public static void Change(ref int a, ref int b) { int temp = a; a = b; b = temp; } } }
params引數的使用
注:params修飾的引數必須放在函式的最後一個引數位置
class Program { static void Main(string[] args) { int[] data = {1, 2, 3, 4, 5}; string name = "小明"; int sum; //方法一,直接傳遞陣列 GetSum(out sum, data); //方法二,此方法params引數必須放在最後 GetSum(out sum, 1, 2, 3, 4, 5); Console.WriteLine("{0}的成績總分是{1}", name, sum); Console.ReadKey(); } public static void GetSum(out int sum, params int[] Data) { sum = 0; foreach(int i in Data) { sum += i; } } }