How does one represent the empty char

Question

I m currently writing a little program but I keep getting this error when compiling     error  empty character constant   I realize it s because I m trying to replace a valid char with empty space c i     but I have not been able to find another way to represent it

User · Answer

Yes  c i     is not a valid code  We parenthesis character constant between      e g  c i     A   char A  but you don t write any char in between         Empty space is nothing but suppose if you wants to assigned space then do    c i                    space    if wants to assigned nul char then do   c i      0              null symbol    Example  Suppose if  c   a string   nul  0 terminated char array  if you having  a string  for example    char c 10      a    2    c     0      And you replace second char with space    c 1           and if you print it using printf as follows    printf   n c   s   c     then output would be     c   a  c           space printed    And you replace second char with   0     c 1      0     then output would be     c   a   because string terminated with  0

User · Answer

It might be useful to assign a null in a string rather than explicitly making some index the null char   0   I ve used this for testing functions that handle strings ensuring they stay within their appropriate bounds   With   char test src      fuu 0foo     This creates an array of size 8 with values     f    u    u     0    f    o    o     0

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There is no such thing as the  empty character        If you need a space character  that can be represented as a space  c i        or as its ASCII octal equivalent  c i      040   If you need a NUL character that s c i      0

User · Answer

There are two ways to do the same instruction  that is  an empty string  The first way is to allocate an empty string on static memory   char  my variable         or  if you want to be explicit   char my variable     0     The way posted above is only for a character  And  the second way    include  lt string h gt  char  my variable   strdup        Don t forget to use free   with this one because strdup   use malloc inside

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To represent the fact that the value is not present you have two choices   1  If the whole char range is meaningful and you cannot reserve any value  then use char  instead of char   char   c   new char  N   c 0    NULL     no character  c 1            ordinary character  c 2     a      ordinary character  c 3      0     zero-code character   Then you ll have c i     NULL for when character is not present and otherwise  c i  for ordinary characters   2  If you don t need some values representable in char then reserve one for indicating that value is not present  for example the   0  character   char  c   new char N   c 0      0      no character c 1            ordinary character c 2     a      ordinary character   Then you ll have c i       0  for when character is not present and ordinary characters otherwise

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You can use c i     0  or simply c i     char  0   The null empty char is simply a value of zero  but can also be represented as a character with an escaped zero

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String before   EMPTY SPACE TAB  quot word quot  TAB EMPTY SPACE  Where EMPTY SPACE    quot   quot   this is String  TAB     t   this is Character  String after   before replaceAll  quot   quot    quot  quot   replace   t     0    means after    quot word quot

User · Answer

The empty space char would be      If you re looking for null that would be   0

User · Answer

You can t store  no character  in a character - it doesn t make sense   As an alternative you could store a character that has a special meaning to you - e g  null char   0  - and treat this specially

[c] How does one represent the empty char?

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