In-depth analysis of C ++ Vector usage

In C ++ programming language, there is an application method called Vector. Its role is very important in actual programming. Here we will give you a detailed introduction to the application skills and basic content of C ++ Vector, hoping to help you.

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• C ++ pointer drift Solution
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• Tips for deleting C ++ container values
• Overview of basic concepts of C ++ set Initialization

(1) vector <type> identifier;

(2) vector <type> identifier (maximum capacity );

(3) vector <type> maximum identifier capacity, all initial values );

(4) int I [4] = {12, 3, 4, 5 };

 
 

  
  
Vector <type> vi (I, I + 2); // obtain the value after I index value is 3;
 
 

(5) vector <int> // vi defines a 2-dimensional container. Remember to have spaces. Otherwise, an error will be reported.

 
 

  
  
Vector <int> line
  
  
// When using the tool, you must first initialize the vi rows;
  
  
For (int I = 0; I <10; I ++)
  
  
{
  
  
Vector. push_back (line );
  
  
}
  
  
/// I personally think it is good to define a two-dimensional array using vector,
Because the length is not predetermined. Good.
 
 

(6) C ++ Vector sorting

 
 

  
  
Vector <int> vi;
  
  
Vi. push_back (1 );
  
  
Vi. push_back (3 );
  
  
Vi. push_back (0 );
  
  
Sort (vi. begin (), vi. end (); // small to large
  
  
Reverse (vi. begin (), vi. end () // small from Avenue
 
 

(7) sequential access

 
 

  
  
Vector <int> vi;
  
  
For (int I = 0; I <10; I ++)
  
  
{
  
  
Vector. push_back (I );
  
  
}
  
  
For (int I = 0; I <10; I ++) // The first call method.
  
  
{
  
  
Cout <vector [I] <"";
  
  
}
  
  
For (vector <int >:: iterator it = vi. begin ();
  
  
It! = Vi. end (); it ++) // The second call Method
  
  
{
  
  
Cout <* it <"";
  
  
}
 
 

(8) Search

 
 

  
  
Vector <int> vi;
  
  
For (int I = 0; I <10; I ++)
  
  
{
  
  
Vector. push_back (I );
  
  
}
  
  
Vector <int>: interator it = find (vi. begin (), vi. end, 3 );
  
  
Cout <* it <endl; // return the location of the value in the container.
 
 

(9) Use arrays to initialize the C ++ Vector.

 
 

  
  
Int I [10] = {1, 2, 4, 5, 6, 7, 78, 8 };
  
  
/// First
  
  
Vector <int> vi (I + 1, I + 3); // from the first element to the third element
  
  
For (vector <int >:: interator it = vi. begin ();
  
  
It! = Vi. end (); it ++)
  
  
{
  
  
Cout <* it <"";
  
  
}
 
 

(10) struct type

 
 

  
  
struct temp  
  
  
{  
  
  
public :  
  
  
string str ;   
  
  
public :  
  
  
int id ;  
  
  
}tmp  
  
  
int main()  
  
  
{  
  
  
vector <temp> t ;   
  
  
temp w1 ;   
  
  
w1.str = "Hellowor" ;  
  
  
w1.id = 1 ;   
  
  
t.push_back(t1);  
  
  
cout << w1.str << "," <<w1.id <<endl ;   
  
  
return 0 ;   
  
  
} 
 
 

The basic introduction of C ++ Vector is here.