Basic Vector operations,

Basic Vector operations,

(1) header file # include <vector>.
(2) create a vector object, vector <int> vec;
(3) Insert numbers at the end: vec. push_back ();
(4) use a subscript to access the element. cout <vec [0] <endl; remember that the subscript starts from 0.
(5) use an iterator to access elements.
Vector <int>: iterator it;
For (it = vec. begin (); it! = Vec. end (); it ++)
Cout <* it <endl;
(6) insert element: vec. insert (vec. begin () + I, a); insert a before the I + 1 element;
(7) delete element: vec. erase (vec. begin () + 2); Delete 3rd Elements
Vec. erase (vec. begin () + I, vec. end () + j); Delete interval [I, J-1]; interval starts from 0
(8) vector size: vec. size ();
(9) clear: vec. clear ();

The following is a simple example:

# Include <iostream> # include <stdio. h ># include <vector> // Variable Length array, vector # include <string> using namespace std; int main () {vector <string> v; string temp; cout <"enter a string and press Ctrl + Z to end the loop:" <endl; while (getline (cin, temp )) // Ctrl + Z end loop {v. push_back (temp);} vector <string>: iterator t; // defines an iterator t = v. begin (); for (t; t! = V. end (); t ++) {(* t) [0] = toupper (* t) [0]); // change the first letter at the beginning to uppercase cout <* t <endl;} return 0;}/* main function: enter a string and then output a string, input the first letter in uppercase: ginger, you are the best! ^ Z output: Ginger, you are the best! */