C + + vector

A few days ago, netizens asked me the use of vector in C + +, now a simple summary of the vector, sharing csdn netizens. Description: Things are relatively simple, if you are very cow, please close this page directly!

The first is the statement of the vector:
#include <vector>
using namespace Std; In this statement
...
Vector<int> i;
...
Or
#include <vector>
...
Std::vector<int> i; Explicitly declare here

See Specific use:
1.vector of data deposit and output:

[CPP]View Plaincopy

1. Vector<cstring> v;
2. for (int i =0;i<40;i++)
3. {
4. CString s;
5. S.format ("%d", I);
6. V.push_back (s);
7. }
8. CString SS;
9. for (Int J =0;j<v.size (); j + +)
10. {
11. ss+=v[j]+",";
12. }
13. MessageBox (ss);

Note: You can also use V.begin () and V.end () to get the pointer position of the starting and ending element addresses of the vector. You can also do this:

[CPP]View Plaincopy

1. VECTOR<CSTRING>&NBSP;V;&NBSP;&NBSP;
2. for (int i =0;i<40;i++)   
3. {&NBSP;&NBSP;
4.     cstring s;  
6.      v.push_back (s);   
7. }&NBSP;&NBSP;
8. cstring ss ;  
9. VECTOR<CSTRING>::ITERATOR&NBSP;ITER;&NBSP;&NBSP;
10. for (  iter = v.begin ();  iter != v.end (); iter++ )    
11. {&NBSP;&NBSP;
12.     ss+= *iter+
13. }&NBSP;&NBSP;
14. MessageBox (ss);   

2. Definition of two-dimensional vector (starting with fixed length)

[CPP]View Plaincopy

2. vector< vector<cstring> > Array (vector<cstring> (0));
4. for ( int j = 0; J <; J + +)
6. {
8. For (int i = 0; i < 9; i++)
10. {
12. CString s;
14. S.format ("%d", I);
16. array[I].push_back (s);
18. }
20. }
24. CString SS;
26. for ( int jj = 0; JJ < jj++)
28. {
30. For (int II = 0; II < array[JJ].size (); ii++)
32. {
34. SS+=ARRAY[JJ][II];
36. }
38. }
40. MessageBox (ss);

3. Define an array in which the rows and columns are changed

[CPP]View Plaincopy

2. int i = 0, j = 0;
4. vector< vector<cstring> > Array;
6. vector< CString > line;
8. for (j = 0; J <; J + +)
10. {
12. Array.push_back (line);  //To initialize each vector, the element cannot be deposited.
14. For (i = 0; i < 9; i++)
16. {
18. CString s;
20. S.format ("%d", I);
22. array[J].push_back (s);
24. }
26. }
30. CString SS;
32. for (int JJ = 0;jj<array.size (); jj++)
34. {
36. For (int II =0;ii<array[jj].size (); ii++)
38. {
40. SS+=ARRAY[JJ][II];
42. }
44. }
46. MessageBox (ss);

C + + vector