c – 数组溢出(为什么这有效？)

好吧,所以我正在教我的女朋友一些c,她写了一个我觉得不行的程序,但确实如此.它访问数组中的另一个元素然后存在(例如,访问数组大小为5的数组[5]).这是缓冲区溢出的实例吗？我对它的想法是它在数组之后直接写入/访问内存,这是正确的吗？基本上我的问题是..为什么这样做？

#include <iostream>

using namespace std;

int main()
{
int size;

cout << "Please enter a size for the array." << endl;
cin >> size;
cout << endl;

cout << "There are " << size << " elements in this array." << endl;
cout << endl;
cout << endl;
cout << endl;

int array[size];

for (int counter = 1; counter <= size; counter++)

{
    cout << "Please enter a value for element " << counter << "." << endl;
    cin >> array[counter];

}

cout << endl;
cout << endl;


for (int counter = 1; counter <= size; counter++)

{
    cout << "Element " << counter << " is " << array[counter] << "." << endl;
    cout << endl;

}

cout << "*bing! :)" << endl;
cout << endl;


return 0;
}