C array initialization

Question

is this form  of intializing an array to all 0s   char myarray ARRAY SIZE     0    supported by all compilers      if so  is there similar syntax to other types  for example   bool myBoolArray ARRAY SIZE     false

User · Answer

You can declare the array in C   in these type of ways  If you know the array size then you should declare the array for  integer  int myArray array size   Double  double myArray array size   Char and string   char myStringArray array size   The difference between char and string is as follows  char myCharArray 6    a   b   c   d   e   f    char myStringArray 6   abcdef     If you don t know the size of array then you should leave the array blank like following   integer  int myArray array size    Double  double myArray array size

User · Answer

Note that the     is optional in C  11 universal initialization syntax  and it is generally considered better style to write    char myarray ARRAY SIZE   0

User · Answer

Yes  this form of initialization is supported by all C   compilers  It is a part of C   language  In fact  it is an idiom that came to C   from C language  In C language     0   is an idiomatic universal zero-initializer  This is also almost the case in C     Since this initalizer is universal  for bool array you don t really need a different  syntax   0 works as an initializer for bool type as well  so  bool myBoolArray ARRAY SIZE      0      is guaranteed to initialize the entire array with false  As well as  char  myPtrArray ARRAY SIZE      0      in guaranteed to initialize the whole array with null-pointers of type char      If you believe it improves readability  you can certainly use  bool myBoolArray ARRAY SIZE      false    char  myPtrArray ARRAY SIZE      nullptr      but the point is that     0   variant gives you exactly the same result   However  in C       0   might not work for all types  like enum types  for example  which cannot be initialized with integral 0  But C   supports the shorter form  T myArray ARRAY SIZE          i e  just an empty pair of     This will default-initialize an array of any type  assuming the elements allow default initialization   which means that for basic  scalar  types the entire array will be properly zero-initialized

User · Answer

Yes  I believe it should work and it can also be applied to other data types   For class arrays though  if there are fewer items in the initializer list than elements in the array  the default constructor is used for the remaining elements  If no default constructor is defined for the class  the initializer list must be complete     that is  there must be one initializer for each element in the array

[c++] C++ array initialization

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