stu1

#include <iostream>
#include <cstdlib>
using namespace std;
int main(void)
{
    int length = 0;
    int* arr = NULL;
    arr = new int[length];
    cout<<" array size ???? ";
    cin>> length;
    // initiallize
    for(int k = 0; k<length; k++)
        arr[k] = 0;
       
    //test data insert
    arr[0] = 1;
    arr[1] = 2;

    for(int j = 0; j<length; j++)
        cout<<arr[j]<<endl;

    return 0;
}

#include <iostream>
#include <vector>
using namespace std;
int main(void)
{
    vector<int> v; //[v는 빈 컨테이너이다.]
    v.reserve(10); //벡터 메모리 공간 & 예약

    //데이터 삽입
    v.push_back(10);
    v.push_back(20);
    v.push_back(30);
    v.push_back(40);
    v.push_back(50);
    v.push_back(60);

    for (vector<int>::size_type i = 0; i< v.size(); i++)
        cout << v[i] <<endl;
    return 0;
}