Declaring-Arrays-and-Pointers.md

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20.1.1 Declaring Arrays and Pointers

To declare a variable that is an array, write variable[length] for decorated-variable:

int foo[5];

To declare a variable that has a pointer type, write *variable for decorated-variable:

struct list_elt *foo;

These constructs nest. For instance,

int foo[3][5];

declares foo as an array of 3 arrays of 5 integers each,

struct list_elt *foo[5];

declares foo as an array of 5 pointers to structures, and

struct list_elt **foo;

declares foo as a pointer to a pointer to a structure.

int **(*foo[30])(int, double);

declares foo as an array of 30 pointers to functions (see Function Pointers), each of which must accept two arguments (one int and one double) and return type int **.

void
bar (int size)
{
  int foo[size];
  …
}

declares foo as an array of integers with a size specified at run time when the function bar is called.