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#include <iostream>

#include <vector>

using namespace std;

int main(){

// cout<<"I'm going to learn Vectors."<<endl;

vector<int> vec;

vec.push_back(2);

vec.push_back(7);

vec.push_back(6);

vec.push_back(8);

vec.emplace_back(9);

vec.pop_back();

for(int val:vec){

cout<<val<<" ";

}

cout<<endl;

cout<<"Value at index: " <<vec[3]<< " or " << vec.at(3)<<endl;

cout << "is vector empty ? " << vec.empty() << endl; // To check a vector have elements or not?

vec.erase(vec.begin() + 1, vec.begin() + 3); // To remove more elements from vector

vec.insert(vec.begin() + 1, 9); // To add an element at specific position

cout<<"First Entry is " <<vec.front()<<endl;

cout<<"Last Entry is " <<vec.back()<<endl;

cout<<vec.size()<<endl;

cout<<vec.capacity()<<endl;

// vector with initilize values

vector<int> arr = {1,2,3,8,9};

for(int val:arr){

cout<<val<<" ";

}