Differences between pointer arrays and binary Arrays

Source: Internet
Author: User

There are two definitions below:
Int a [10] [20];
Int * B [10];
A is a real binary array. It allocates 200 int-type buckets and obtains matrix elements through regular matrix subscript operations,
For B, the definition is assigned with only 10 pointers, and they are not initialized. They must be initialized in the display mode, such as static initialization or code initialization. assuming that each element of B points to an array with 20 elements, the compiler will allocate 200 int-type storage space and 10 pointers to it.
The advantage of the pointer array is that the length of each row of the array can be different.

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