C++ Program to implement the use of STL vector :

stlvector.cpp

#include<iostream>
#include<vector>

                // Similar to array but useful when the number of elements (size) is unknown...

using namespace std;

int main()
{
    vector<int>v;
    int t;
    cout<<"Enter the numbers ( Number 6 to terminate ) ";
    while(1){
        cin>>t;
        if(t==6)break;
        v.push_back(t);
    }
    cout<<"\nThe entered  numbers are..";
    for(int i=0;i<v.size();i++){
        cout<<v[i]<<" ";
    }
    return 0;
}