Int? (*p) [4]?p? is a level two pointer? A two-dimensional array? Level two pointer?. Xml

Pre{line-height:1;color: #2f88e4; Background-color: #e9ffff; font-size:16px;}. Sysfunc{color: #3d7477; font-style:italic;font-weight:bold;}. Selffuc{color: #a0b684;}. Bool{color: #86ddd8;}. Condition{color: #94e269; font-weight:bold;}. Key{color: #ae0bfd;}. Var{color: #e81cb6; font-style:italic;}. Digit{color: #ef09ef; font-weight:bold;}. Includepre{color: #e4882f;}. operator? {color: #96d186; font-weight:bold;}

Test One:

   
    Int?
    
     A[
     
      3][
      
       4]={
       
        1,
        
         2,
         
          3,
          
           4,
           
            5,
            
             6,
             
              7,
              
               8,
               
                9,
                
                 10,
                 
                  11,
                  
                   12
                   
                    };
                    
                     Int?
                     
                      (*
                      
                       P
                       
                        )[
                        
                         
                          4]; 
                          
                           for 
                           
                            ( 
                            
                             p 
                             
                              =& 
                              
                               a[ 
                               
                                0]; 
                                
                                 p<& 
                                 
                                  a[ 
                                  
                                   0]+ 
                                   
                                    3; 
                                    
                                     p++) 
                                     
                                      cout<<& 
                                      
                                       p<<endl; 
                                       
                                      
                                     
                                    
                                   
                                  
                                 
                                
                               
                              
                             
                            
                           
                         
                        
                       
                      
                     
                    
                   
                  
                 
                
               
              
             
            
           
          
         
        
       
      
     
    
   

0012ff40

0012ff40

0012ff40

 
    
     
  For
  
     
      
   (
   
      
       
    p
    
       
        
     =&
     
        
         
      a[
      
         
           0]; 
          
            p<& 
           
             a[ 
            
              0]+ 
             
               3; 
              
                p++) 
               
                 cout<< 
                
                  p<<endl; 
                 
                
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

0012ff44

0012ff54

0012ff64

 
    
     
  For
  
     
      
   (
   
      
       
    p
    
       
        
     =&
     
        
         
      a[
      
         
           0]; 
          
            p<& 
           
             a[ 
            
              0]+ 
             
               3; 
              
                p++) 
               
                 cout<<* 
                
                  p<<endl; 
                 
                
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

0012ff44

0012ff54

0012ff64

 
    
     
  For
  
     
      
   (
   
      
       
    p
    
       
        
     =&
     
        
         
      a[
      
         
           0]; 
          
            p<& 
           
             a[ 
            
              0]+ 
             
               3; 
              
                p++) 
               
                 cout<<** 
                
                  p<<endl; 
                 
                
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

1

5

9

Summarized as follows:

???
   
    Pis a level two pointer??? &
    
     P? is the address of the cell that holds this level two pointer?: 0012ff40???
     
      PThe value is: 0012ff44??? *
      
       P? is
       
        
          P points to the contents of the unit, because 
         
           P is a level two pointer and 
          
            P points to a combined unit (composed of four shapes), so? The compiler will? * 
           
             P is interpreted as the address of the first element in a composition unit: 0012ff44??? * * 
            
              P? is the value of the first element in the first row? 
             
               1??? This level two pointer is very special, because:? 
              
                P and * 
               
                 P are the same values? But the compiler will explain them differently, 
                
                  P? is interpreted as the address of the first element of the line, the action unit is an element??? In the same vein? The two-dimensional array name 
                 
                   A, also a level two pointer??? 
                  
                    A? is the first address of the line??? * 
                   
                     A? is the first element of the line first address??      
                    
                   
                  
                  
                
               
             
            
           
          
         
        
       
      
     
    
   

Test Two:

???
 For 
    
  
     
      
   (
   
      
       
    int?
    ) 
       
        
     i
     
        
         
      =
      
         
           0; 
          
            i< 
           
             ; 
            
              i++)??? 
             
               cout<<** 
              
                a<<endl; 
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

1

1

1

1

1

1

1

1

1

1

1

1

??
 For 
    
  
     
      
   (
   
      
       
    int?
    ) 
       
        
     i
     
        
         
      =
      
         
           0; 
          
            i< 
           
             ; 
            
              i++)? ? 
             
               cout<<** (a 
              
                + 
               
                 i 
                
                  ) <<endl;
                 
                
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

1

5

9

4232719

1447838469

1245116

476002356

4269248

2088857559

-
 
    
     
  2141931795
 
    

2088999592

0

 
    
     
  For
  
     
      
   (
   
      
       
    int?
    ) 
       
        
     i
     
        
         
      =
      
         
           0; 
          
            i< 
           
             ; 
            
              i++) 
             
               cout<<* (* a 
              
                + 
               
                 i 
                
                  ) <<endl;
                 
                
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

1

2

3

4

5

6

7

8

9

10

11

12

 
    
     
  For
  
     
      
   (
   
      
       
    int?
    ) 
       
        
     i
     
        
         
      =
      
         
           0; 
          
            i< 
           
             ; 
            
              i++) 
             
               cout<<& 
              
                a<<endl; 
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

 
    
     
  For
  
     
      
   (
   
      
       
    int?
    ) 
       
        
     i
     
        
         
      =
      
         
           0; 
          
            i< 
           
             ; 
            
              i++) 
             
               cout<< 
              
                a<<endl; 
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

 
    
     
  For
  
     
      
   (
   
      
       
    int?
    ) 
       
        
     i
     
        
         
      =
      
         
           0; 
          
            i< 
           
             ; 
            
              i++) 
             
               cout<<* 
              
                a<<endl; 
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

0012ff44

 
    
     
  For
  
     
      
   (
   
      
       
    int?
    ) 
       
        
     i
     
        
         
      =
      
         
           0; 
          
            i< 
           
             ; 
            
              i++) 
             
               cout<<** 
              
                a<<endl; 
               
              
             
            
           
         
     
        
    
       
   
      
  
     
 
    

1

1

1

1

1

1

1

1

1

1

1

1

Can you see from the top? is the array name a special pointer? Because the &A is the same as the value of a?, which means that the system does not assign an address space to an array name

?? In addition, the array name is also a level two pointer

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Int? (*p) [4]?p? is a level two pointer? A two-dimensional array? Level two pointer?. Xml