constexpr size_t rowCnt = 3, colCnt = 4;
int ia[rowCnt][colCnt] = {0};
//-----使用for语句管理迭代过程----------------------
for (auto &row : ia) {
    for (auto col : row)
        cout << col << ' ';
    cout << endl;
}
//-----使用下标运算符-----------------------------
for (auto p = begin(ia); p != end(ia); ++p) {
    for (auto q = begin(*p); q != end(*p); ++q)
        cout << *q << ' ';
    cout << endl;
}

//-----使用指针---------------------------------
for (auto p = ia; p != ia + 3; ++p) {
    for (auto q = *p; q != *p + 4; ++q)
        cout << *q << ' ';
    cout << endl;
}
//------使用类型别名简化---------------------------------
using int_array = int[4];
typedef int int_array[4];
for (int_array *p = ia; p != ia + 3; ++p) {
    for (auto *q = *p; q != *p + 4; ++q)
        cout << *q << ' ';
    cout << endl;
}