C + + pointers and arrays

Working with multidimensional arrays inside C + +

    intarr[2][3] = { {1,2,3}, {4,5,6} };int* P1 = (int*) (arr +1);cout<< p1[0] << Endl;int* P2 = (int*) (&arr +1);cout<< p2[-1] << Endl;cout<< arr << Endl;cout<< &arr << Endl; P1 = (int*) arr[1];cout<< p1[0] << Endl;

Run the above code to debug intermediate process discovery
ARR is an int (*) [3] type, &arr is an int (*) [2][3] type, such as the following example:

    int arr[2][3123456 } };    int (*p1)[3] = arr;    int (*p2)[2][3] = &arr;

&arr returns the entire array as a pointer

And wrote a small example.

    int arr[2][3{ { 1, 2, 3 }{ 4, 5, 6 } };    cout << arr << endl << &arr << endl;

Output Result:

I understand that arr is the array name, the first address of the array store, &arr is the entire array as a variable, so the return address is the first address of the array, is the same, just pointer type, arr is the shaping pointer, &arr is an array pointer.

Array pointer: Pointer to an array with the same size as the array
Array of pointers: one element represents a pointer, the pointer size is the same, and is approximate by the pointer array type.

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C + + pointers and arrays