C # packing and unpacking,

C # packing and unpacking,

1: Packing

In fact, it is to convert a value type into a reference type, or convert the value type into an interface type that is applied by the value type. This process uses the stack. The boxed value is assigned as a copy to the object.

Int intValue = 100;

Object obj = I;

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1. Using System;
2. Using System. Collections. Generic;
3. Using System. Linq;
4. Using System. Text;
5. Using System. Collections;
7. Namespace ConsoleApplication1
8. {
9. Class Program
10. {
11. Public static void Main (String [] args)
12. {
13. ArrayList arrayList = new ArrayList ();
14. For (int I = 0; I <10; I ++)
15. {
16. ArrayList. Add (I); // boxed
17. }
18. For (int I = 0; I <10; I ++)
19. {
20. Console. WriteLine (arrayList [I]);
21. }
22. Console. ReadLine ();
24. }
25. }
26. }

2: binning

Unpacking refers to the process of converting a reference class or an object type into a value type. Its execution process is divided into two phases:

(1) Check the instance of the object to see if it is a boxed value of the value type, such as the reference type.

(2) copy the Instance value to the value type variable.

Int I = 100;

Object obj = I;

Int j = (int) obj;

& In C Language

& Can be used as the bitwise AND or address fetch Operator
The following describes two usage methods:
1. bitwise and operation bitwise AND operator "&" are binary operators. Its function is the binary phase corresponding to the two numbers involved in the operation. The result bit is 1 only when the two binary numbers are 1. Otherwise, the result bit is 0. The number of involved operations is supplemented.
For example, 9 & 5 can be written as follows: 00001001 (Binary complement of 9) & 00000101 (Binary complement of 5) 00000001 (Binary complement of 1) Visible 9 & 5 = 1.
Bitwise AND operations are usually used to clear some bits or retain some bits. For example, if a clears the high eight bits of 0 and retains the low eight bits, it can be used as a & 255 operation (255 of the binary number is 0000000011111111 ).
2. Get the address
& As The unary operator, the result is the address of the right operation object.
For example, & x returns the address of x.
The address itself is an abstract concept used to indicate the logical location of an object in the memory.

& In C Language

& Can be used as the bitwise AND or address fetch Operator
The following describes two usage methods:
1. bitwise and operation bitwise AND operator "&" are binary operators. Its function is the binary phase corresponding to the two numbers involved in the operation. The result bit is 1 only when the two binary numbers are 1. Otherwise, the result bit is 0. The number of involved operations is supplemented.
For example, 9 & 5 can be written as follows: 00001001 (Binary complement of 9) & 00000101 (Binary complement of 5) 00000001 (Binary complement of 1) Visible 9 & 5 = 1.
Bitwise AND operations are usually used to clear some bits or retain some bits. For example, if a clears the high eight bits of 0 and retains the low eight bits, it can be used as a & 255 operation (255 of the binary number is 0000000011111111 ).
2. Get the address
& As The unary operator, the result is the address of the right operation object.
For example, & x returns the address of x.
The address itself is an abstract concept used to indicate the logical location of an object in the memory.