char array and char array

Question

if I write this   char  array    One good thing about music     I actually create an array  I mean it s the same like this   char array       One    good    thing    about    music

User · Answer

No  Actually it s the  same  as  char array       O    n    e          i   c    0      Every character is a separate element  with an additional  0 character as a string terminator   I quoted  same   because there are some differences between char   array and char array    If you want to read more  take a look at C  differences between char pointer and array

User · Answer

No  you re creating an array  but there s a big difference   char  string    Some CONSTANT string   printf   c n   string 1     prints o string 1     v    INVALID     The array is created in a read only part of memory  so you can t edit the value through the pointer  whereas   char string      Some string     creates the same  read only  constant string  and copies it to the stack array  That s why   string 1     v     Is valid in the latter case  If you write   char string       some     string      the compiler should complain  because you re constructing an array of char arrays  or char pointers   and assigning it to an array of chars  Those types don t match up  Either write   char string       s   o   m    e         s    t   r   i   n   g     o      this is a bit silly  because it s the same as char string      some string     or char  string       some     string     array of pointers to CONSTANT strings   or char string   10      some     string      Where the last version gives you an array of strings  arrays of chars  that you actually can edit

User · Answer

It s very similar to  char array       O    n    e          etc         m    u    s    i    c     0      but gives you read-only memory   For a discussion of the difference between a char   and a char    see comp lang c FAQ 1 32

User · Answer

The declaration and initialization  char  array    One good thing about music     declares a pointer array and make it point to a constant array of 31 characters   The declaration and initialization  char array      One  good  thing  about  music     declares an array of characters  containing 31 characters   And yes  the size of the arrays is 31  as it includes the terminating   0  character     Laid out in memory  it will be something like this for the first     -------       ------------------------------    array   --     One good thing about music     -------       ------------------------------    And like this for the second     ------------------------------     One good thing about music     ------------------------------      Arrays decays to pointers to the first element of an array  If you have an array like  char array      One  good  thing  about  music     then using plain array when a pointer is expected  it s the same as  amp array 0    That mean that when you  for example  pass an array as an argument to a function it will be passed as a pointer   Pointers and arrays are almost interchangeable  You can not  for example  use sizeof pointer  because that returns the size of the actual pointer and not what it points to  Also when you do e g   amp pointer you get the address of the pointer  but  amp array returns a pointer to the array  It should be noted that  amp array is very different from array  or its equivalent  amp array 0    While both  amp array and  amp array 0  point to the same location  the types are different  Using the arrat above   amp array is of type char     31   while  amp array 0  is of type char       For more fun  As many knows  it s possible to use array indexing when accessing a pointer  But because arrays decays to pointers it s possible to use some pointer arithmetic with arrays   For example   char array      Foobar       Declare an array of 7 characters      With the above  you can access the fourth element  the  b  character  using either  array 3    or    array   3    And because addition is commutative  the last can also be expressed as    3   array    which leads to the fun syntax  3 array

[c] char *array and char array[]

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