[c++] Pointer (포인터)

1. 포인터 덧셈
   원소의 타입에 따라 주소 간격이 다름

    //short이므로 2byte 씩 증가
    short arr[5];
    short* parr = &arr[2];
    cout << parr << endl;
    cout << parr+1 << endl;
    cout << parr+2 << endl;

2. 포인터 뺄셈
   주소 사이 간격

    int* p1 = &arr[1];
    int* p2 = &arr[4];
   
    cout << p1 << endl;
    cout << p2 << endl;
    cout << p2- p1 << endl; //3 

3. 배열 포인터

    long arry[10];
    long(*p)[10] = &arry; //배열명으로 초기화 할 수 없음
   
    (*p)[5] = 100;
    cout << arry[5] << endl;

4. 포인터 배열

   
    short a, b, c=5;
    short* arr[3];
    arr[0] = &a;
    arr[1] = &b;
    arr[2] = &c;
   
    cout << arr[0] << endl;
    cout << arr[1] << endl;
    cout << arr[2] << endl;
    cout << &arr[0] << endl;
    cout << &arr[1] << endl;
    cout << &arr[2] << endl;
    cout << *arr[0] << endl;
    cout << *arr[1] << endl;
    cout << *arr[2] << endl;