C # data structure

Variable Types

1. Value Type

   1. bool Boolean
   2. btye 8-bit unsigned integer 0x00 ~ 0xff
   3. char 16-bit unsigned integer
   4. decimal 128 decimal place accuracy value of 10
   5. double    64位
   6. float 32 bit
   7. int 32 bit
   8. long 64 Wei
   9. sbyte 8-bit signed
   10. short 16 Wei
   11. uint 32-bit unsigned
   12. ulong 64-bit unsigned
   13. ushort 16-bit unsigned 

           sizeof can get a variable number of bits

1. Reference types
   1. Reference type does not contain the value stored in the variable, the type of reference point to a memory location
   2. Built-in reference types are object dynamic string
   3. Object Types
   4. Dynamic type
      1. You can store any type of value to a variable take effect at runtime
   5. String type
      1. String str= “Helloworld“;
      2. @ Characters plus guidance, you can put string '\' character to look @ "\\ HelloWorld" == "\ HelloWorld"
      3. String can be any line feeds, spaces and line breaks bonds are considered within the string length

         using System;
         using System.Collections.Generic;
         using System.Linq;
         using System.Text;
         
         namespace StudentCShrap
         {
             class MainClassTest
             {
                 static void Main(string[] args)
                 {
                     String str = "Helloworld\n\n\n";
                     Console.WriteLine(str.Length);//13 length
                     str = @"12345897522
                             4152454
                                 524154";
                     Console.WriteLine(str.Length);//72 length
                     
         
         
                     Console.ReadKey();
                     
                 }
             }
         }
         

          

2. Pointer types
   1. Another type of memory with the memory address of the C and C ++ pointers have the same effect

      using System;
      using System.Collections.Generic;
      using System.Linq;
      using System.Text;
      
      namespace StudentCShrap
      {
          class MainClassTest
          {
              static void Main(string[] args)
              {
                  int* Leng; //错误 CS0214: 指针和固定大小缓冲区只能在不安全的上下文中使用
                  Console.ReadKey();
                  
              }
          }
      }