vector in c 2b 2b

1// CPP program to create an empty vector 
2// and push values one by one. 
3#include <vector>
4
5using namespace std;
6int main() 
7{ 
8    // Create an empty vector 
9    vector<int> vect;  
10    //add/push an integer to the end of the vector
11    vect.push_back(10); 
12	//to traverse and print the vector from start to finish
13    for (int x : vect) 
14        cout << x << " ";
15
16    return 0; 
17}

1#include <vector>
2
3int main() {
4  std::vector<int> v;
5  v.push_back(10); // v = [10];
6  v.push_back(20); // v = [10, 20];
7  
8  v.pop_back(); // v = [10];
9  v.push_back(30); // v = [10, 30];
10  
11  auto it = v.begin();
12  int x = *it; // x = 10;
13  ++it;
14  int y = *it; // y = 30
15  ++it;
16  bool is_end = it == v.end(); // is_end = true
17  
18  return 0;
19}

1#include <vector>
2#include <string>
3
4int main() {
5  std::vector<std::string> str_v;
6  str_v.push_back("abc");
7  str_v.push_back("hello world!!");
8  str_v.push_back("i'm a coder.");
9  for(auto it = str_v.beigin();it != str_v.end(); it++) {
10  	printf("%s\n",it->c_str());
11  }
12}

1#include <vector>
2
3int main() {
4  std::vector<int> myVector = { 666, 1337, 420 };
5  
6  size_t size = myVector.size(); // 3
7  
8  myVector.push_back(399); // Add 399 to the end of the vector
9  
10  size = myVector.size(); // 4
11}

1
2vector<int> vec;
3//Creates an empty (size 0) vector
4 
5
6vector<int> vec(4);
7//Creates a vector with 4 elements.
8
9/*Each element is initialised to zero.
10If this were a vector of strings, each
11string would be empty. */
12
13vector<int> vec(4, 42);
14
15/*Creates a vector with 4 elements.
16Each element is initialised to 42. */
17
18
19vector<int> vec(4, 42);
20vector<int> vec2(vec);
21
22/*The second line creates a new vector, copying each element from the
23vec into vec2. */

1vector<int> g1; 
2  
3    for (int i = 1; i <= 5; i++) 
4        g1.push_back(i); 
5  
6    cout << "Output of begin and end: "; 
7    for (auto i = g1.begin(); i != g1.end(); ++i) 
8        cout << *i << " "; 
9  
10    cout << "\nOutput of cbegin and cend: "; 
11    for (auto i = g1.cbegin(); i != g1.cend(); ++i) 
12        cout << *i << " "; 
13  
14    cout << "\nOutput of rbegin and rend: "; 
15    for (auto ir = g1.rbegin(); ir != g1.rend(); ++ir) 
16        cout << *ir << " "; 
17