C#——经典案例

输出整型数据 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Integer { class Program { static void Main(string[] args) { sbyte Sbyte = 100; byte Byte = 200; char Char = '\u0061'; short Short = 30000; ushort UShort = 60000; int Int = 200000000; uint Uint = 40000000; long Long = 9000000000000; ulong ULong = 18000000000000; Console.WriteLine("有符号字节型\t{0}", Sbyte); Console.WriteLine("无符号字节型\t{0}", Byte); Console.WriteLine("字符型\t\t{0}", Char); Console.WriteLine("有符号短整型\t{0}",Short) ; Console.WriteLine("无符号短整型\t{0}",UShort); Console.WriteLine("有符号整型\t{0}",Int); Console.WriteLine("无符号整型\t{0}", Uint); Console.WriteLine("有符号长整型\t{0}", Long); Console.WriteLine("无符号长整型\t{0}", ULong); Console.ReadKey(); } } }

判断矩形是否为正方形——结构体和布尔型 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Integer { class Rectangle { struct rectangle { public int width; public int height; public bool IsSquare() { return width == height; } } static void Main(string[]args) { rectangle re = new rectangle(); re.width = 100; re.height = 200; Console.WriteLine("矩形的宽是：{0}；矩形的长是：{1}。", re.width, re.height); bool result=re.IsSquare(); Console.WriteLine("矩形{0}正方形", result); Console.ReadKey(); } } } Enum using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Integer { class Enum { enum Animal : byte { Dog=0, Cat=1, Mouse=2 } static void Main(string []args) { Animal animal = Animal.Cat; switch (animal) { case Animal.Dog: Console.WriteLine("狗"); break; case Animal.Cat: Console.WriteLine("猫"); break; case Animal.Mouse: Console.WriteLine("鼠"); break; default: break; } Console.ReadKey(); } } } 修改圆柱体的高度和底面半径——引用类型 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Integer { class Reference { //定义圆柱结构体 struct Column { //底面圆形 public Circle Circle; public int Height; } //定义Circle类 class Circle { //定义半径 public int Radius; } static void Main(string []args) { Column column1 = new Column(); Circle circle1 = new Circle(); column1.Height = 20; column1.Circle = circle1; circle1.Radius = 10; Console.WriteLine("圆柱体1高度：{0}", column1.Height); Console.WriteLine("圆柱体1底面半径：{0}",column1.Circle.Radius); Console.WriteLine("将圆柱体1赋值给圆柱体2"); Column column2 = column1; Console.WriteLine("将圆形1半径改为30"); circle1.Radius = 30; Console.WriteLine("圆柱体1的底面半径：{0}", column1.Circle.Radius); Console.WriteLine("圆柱体2的底面半径：{0}", column2.Circle.Radius); Console.WriteLine("圆柱体1的高度：{0}", column1.Height); Console.WriteLine("圆柱体2的高度：{0}", column2.Height); Console.WriteLine("将圆柱体2的高度改为40"); column2.Height = 40; Console.WriteLine("圆柱体1的高度：{0}", column1.Height); Console.WriteLine("圆柱体2的高度：{0}", column2.Height); Console.ReadKey(); } } }