C#2.0实例程序STEP BY STEP－－实例二:数据类型

向右看齐 2022-01-12 12:37 214阅读 0赞

#### C\#2.0实例程序STEP BY STEP－－实例二:数据类型    ####

与其他.NET语言一样,C\#支持Common Type Sysem(CTS),其中的数据类型集合不仅包含我们熟悉的基本类型,例如int,char和float等,还包括比较复杂的类型,例如内部的string类型和表示货币值的decimal类型。而且，每种数据类型不仅是一种基本数据类型，还是一个真正的类，其方法可以用与格式化、系列化和类型转换等。  
下面看第一个例子：值类型--整数类型

![None.gif][] using  System;  
![None.gif][] using  System.Collections;  
![None.gif][] using  System.Collections.Generic;  
![None.gif][] using  System.IO;  
![None.gif][]  
![None.gif][] class  DataTypes  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]publicstaticvoid Main(string\[\] args)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][]bool gobool=true;  
![InBlock.gif][]sbyte sbyteNu; //声明一个sbyte变量,CTS类型为System.sbyte  
![InBlock.gif][]short shortNu; //声明一个short变量,CTS类型为System.Int16  
![InBlock.gif][]int intNu; //声明一个int变量,CTS类型为System.Int32  
![InBlock.gif][]long longNu; //声明一个long变量，CTS类型为System.Int64  
![InBlock.gif][]byte byteNu; //声明一个byte变量，CTS类型为System.Byte  
![InBlock.gif][]ushort ushortNu; //声明一个ushort变量，CTS类型为System.Uint16  
![InBlock.gif][]uint uintNu; //声明一个uint变量，CTS类型为System.Uint32  
![InBlock.gif][]ulong ulongNu=0; //声明一个ulong变量，CTS类型为System.Uint64  
![InBlock.gif][]bool testbool=false;  
![InBlock.gif][]  
![ContractedSubBlock.gif][]![ExpandedSubBlockStart.gif][]sbyte类型\#region sbyte类型  
![InBlock.gif][] Console.WriteLine("请输入一个sbyte类型的整数.sbyte是有8位符号的整数，范围为-128到127之间:");  
![InBlock.gif][]while(gobool)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][]try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][]  
![InBlock.gif][] sbyteNu=sbyte.Parse(Console.ReadLine());  
![InBlock.gif][] Console.WriteLine("\{0\}这是一个sbyte类型的整数。",sbyteNu);  
![InBlock.gif][] gobool=false;  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][]catch(Exception caught)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][] Console.WriteLine(caught.Message\+" 请您重新输入(sbyte是有8位符号的整数，范围为-128到127之间)：");  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][] \}  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][] Console.WriteLine("\\n");  
![ExpandedSubBlockEnd.gif][]\#endregion  
![InBlock.gif][]  
![ContractedSubBlock.gif][]![ExpandedSubBlockStart.gif][]short类型\#region short类型  
![InBlock.gif][] Console.WriteLine("请输入一个Short类型的整数.\\nshort是有16位符号的整数，范围为-32768到32767之间:");  
![InBlock.gif][]while(gobool==false)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][]try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][]  
![InBlock.gif][] shortNu=short.Parse(Console.ReadLine());  
![InBlock.gif][] Console.WriteLine("\{0\}这是一个short类型的整数。",shortNu);  
![InBlock.gif][] gobool=true;  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][]catch(Exception caught)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][] Console.WriteLine(caught.Message\+"\\n请您重新输入(short是有16位符号的整数，范围为-32768到32767之间)：");  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][] \}  
![ExpandedSubBlockEnd.gif][] \}  
![ExpandedSubBlockEnd.gif][]\#endregion  
![InBlock.gif][]  
![ContractedSubBlock.gif][]![ExpandedSubBlockStart.gif][]Int类型\#region Int类型  
![InBlock.gif][] Console.WriteLine();  
![InBlock.gif][] Console.WriteLine("请输入一个int类型的整数.\\nint是有32位符号的整数，范围为-2147483648到2147483647之间:");  
![InBlock.gif][]while(gobool==true)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][]try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][]  
![InBlock.gif][] intNu=int.Parse(Console.ReadLine());  
![InBlock.gif][] Console.WriteLine("\{0\}这是一个int类型的整数。",intNu);  
![InBlock.gif][] gobool=false;  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][]catch(Exception caught)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][] Console.WriteLine(caught.Message\+"\\n请您重新输入(int是有32位符号的整数，范围为-2147483648到2147483647之间)：");  
![ExpandedSubBlockEnd.gif][] \}  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][] Console.WriteLine();  
![ExpandedSubBlockEnd.gif][]\#endregion  
![InBlock.gif][]  
![ContractedSubBlock.gif][]![ExpandedSubBlockStart.gif][]long类型\#region long类型  
![InBlock.gif][] Console.WriteLine("请输入一个long类型的整数.\\nlong是有64位符号的整数，范围为-9223372036854775808到9223372036854775807之间:");  
![InBlock.gif][]while(gobool==false)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][]try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][]  
![InBlock.gif][] longNu=long.Parse(Console.ReadLine());  
![InBlock.gif][] Console.WriteLine("\{0\}这是一个long类型的整数。",longNu);  
![InBlock.gif][] gobool=true;  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][]catch(Exception caught)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]![dot.gif][]\{  
![InBlock.gif][] Console.WriteLine(caught.Message\+"\\n请您重新输入(long是有64位符号的整数，范围为-9223372036854775808到9223372036854775807之间)：");  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][] \}  
![ExpandedSubBlockEnd.gif][] \}  
![InBlock.gif][] Console.WriteLine();  
![ExpandedSubBlockEnd.gif][]\#endregion  
![InBlock.gif][]  
![ContractedSubBlock.gif][]![ExpandedSubBlockStart.gif][]byte类型\#region byte类型  
![InBlock.gif][] Console.WriteLine("byte类型的最小值是\{0\},最大值是\{1\}!",byte.MinValue,byte.MaxValue);  
![InBlock.gif][] byteNu=127;  
![InBlock.gif][] sbyteNu=127;  
![InBlock.gif][] testbool=(byteNu==sbyteNu);  
![InBlock.gif][] Console.WriteLine("判断byteNu和sbyteNu是否相等？"\+testbool);  
![InBlock.gif][] Console.WriteLine();  
![ExpandedSubBlockEnd.gif][]\#endregion  
![InBlock.gif][]  
![ContractedSubBlock.gif][]![ExpandedSubBlockStart.gif][]ushort类型\#region ushort类型  
![InBlock.gif][] Console.WriteLine("ushort类型的最小值是\{0\},最大值是\{1\}!",ushort.MinValue,ushort.MaxValue);  
![InBlock.gif][] ushortNu=65535;  
![InBlock.gif][] shortNu=(short)ushortNu;  
![InBlock.gif][] testbool=(ushortNu==shortNu);  
![InBlock.gif][] Console.WriteLine("shortNu="\+shortNu);  
![InBlock.gif][] Console.WriteLine("ushortNu是否能与shortNu相等？"\+testbool);  
![InBlock.gif][] Console.WriteLine();  
![ExpandedSubBlockEnd.gif][]\#endregion  
![InBlock.gif][]  
![ContractedSubBlock.gif][]![ExpandedSubBlockStart.gif][]uint类型\#region uint类型  
![InBlock.gif][] Console.WriteLine("uint类型的最小值是\{0\},最大值是\{1\}!",uint.MinValue,uint.MaxValue);  
![InBlock.gif][] intNu=-1;  
![InBlock.gif][] uintNu=(uint)intNu;  
![InBlock.gif][] testbool=(intNu==uintNu);  
![InBlock.gif][] Console.WriteLine("uintNu="\+uintNu);  
![InBlock.gif][] Console.WriteLine("uintNu是否能与intNu相等？"\+testbool);  
![InBlock.gif][] Console.WriteLine();  
![ExpandedSubBlockEnd.gif][]\#endregion  
![InBlock.gif][]  
![ContractedSubBlock.gif][]![ExpandedSubBlockStart.gif][]ulong类型\#region ulong类型  
![InBlock.gif][] Console.WriteLine("ulong类型的最小值是\{0\},最大值是\{1\}!",ulong.MinValue,ulong.MaxValue);  
![InBlock.gif][] ulongNu=ulong.MaxValue;  
![InBlock.gif][] longNu=(long)ulongNu;  
![InBlock.gif][] Console.WriteLine("ulongNu=\{0\}\\tlongNu=\{1\}",ulongNu,longNu);  
![InBlock.gif][] Console.WriteLine();  
![ExpandedSubBlockEnd.gif][]\#endregion  
![ExpandedSubBlockEnd.gif][] \}  
![ExpandedBlockEnd.gif][]\}

第二个例子：理解值类型和值类型的转换，还有什么是枚举和结构类型。

using  System;  
  
 class  CValue  
\{  
 static  void  Main( string \[\] args)  
\{  
 // 值类型定义及初始化   
  System.Int16 aShort  =  new  System.Int16 (); // System.Int16 等同与 short关键字   
  byte  aByte  =  new  Byte ();  
 decimal  aDecimal  =  100.5m ;  
 char  aChar  =  ' y ' ;  
Console.WriteLine ( " 值类型的初始化值：\{0\} ,\{1\} ,\{2\} ,\{3\} " ,aShort,aByte,aDecimal,aChar);  
  
 // 值类型的赋值与操作   
  float  aFloat  =  123.123F ;  
 bool  aBool  =  ((aFloat  >  121 )  &&  (aFloat  <  125 ));  
 if  (aBool) \{  
 int  aInteger;  
aInteger  =  ( int ) aFloat; // 显示转换   
   
 double  aDouble;  
aDouble  =  aFloat;  // 隐式转换   
   
Console.WriteLine ( " 类型转换结果：\{0\} ,\{1\} " ,aInteger,aDouble);  
\}  
  
 // 枚举类型的使用   
  long  x  =  ( long )Data.Min ;  
 long  y  =  ( long )Data.Max ;  
Console.WriteLine ( " 枚举类型的值：\{0\} ,\{1\} " ,x,y);  
  
 // 结构的使用   
  MyPoint aPoint;  
aPoint.x  =  10 ;  
aPoint.y  =  100 ;  
Console.WriteLine ( " 结构类型的值：\{0\} ,\{1\} " ,aPoint.x ,aPoint.y );  
  
  
\}  
  
 // 枚举类型的定义   
  enum  Data :  long  \{  
Min  =  255L , Mid  =  1024L , Max  =  32768L   
\};  
  
 // 结构的定义   
  public  struct  MyPoint  
\{  
 public  int  x, y;  
 public  MyPoint(  int  x,  int  y)  
\{  
 this .x  =  x;  
 this .y  =  y;  
\}  
\}  
\}

Step by step!Create Sunshine!

转载于:https://www.cnblogs.com/CreateSunshine/archive/2007/07/09/810734.html

[None.gif]: /images/20220109/6aac34eb221645a7af597626542ddf59.png
[ExpandedBlockStart.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif
[ContractedBlock.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif
[dot.gif]: /images/20220109/676c67b5ef25432c8aadda0cf6c56be0.png
[InBlock.gif]: /images/20220109/865ab068234141b881867389d4b6fd5e.png
[ExpandedSubBlockStart.gif]: /images/20220109/35b9a03e12bb4546945fde0f0a0f8495.png
[ContractedSubBlock.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif
[ExpandedSubBlockEnd.gif]: /images/20220109/32ae971e4850475189bfa8fdff9c4349.png
[ExpandedBlockEnd.gif]: /images/20220109/f671985bbfe44d7dbaf603ba74d4f292.png