What is a flexible array?

C99 Medium

The last element in the structure can be an array of unknown sizes. This is called a flexible array member.

However, there must be at least one other member before the flexible array in the structure. The flexible array member allows the structure to contain a variable-size array.

The size of the structure returned by sizeof does not include the memory of the flexible array.

The malloc function is used to dynamically allocate memory for structures containing soft array members, and the allocated memory should be larger than the structure size to adapt to the expected size of the flexible array.

How to use flexible Arrays: Example:

Typedef struct st_type

{

Int I; int A [0];

} Type_a;

Some compilers report errors and cannot be changed:

Typedef struct st_type

{

Int I; int A [];

} Type_a;