How can I check if char variable points to empty string

Question

How can I check if char  variable points to an empty string

User · Answer

Give it a chance   Try getting string via function gets string  then check condition as  if string 0       0

User · Answer

An empty string has one single null byte  So test if  s 0      char 0

User · Answer

Check if the first character is   0   You should also probably check if your pointer is NULL   char  c       if   c    NULL   amp  amp   c 0       0         printf  c is empty n        You could put both of those checks in a function to make it convenient and easy to reuse   Edit  In the if statement can be read like this   If c is not zero and the first character of character array  c  is not   0  or zero  then       The  amp  amp  simply combines the two conditions  It is basically like saying this   if  c    NULL       AND  or  amp  amp          if  c 0       0             printf  c is empty n              You may want to get a good C programming book if that is not clear to you  I could recommend a book called  The C Programming Language    The shortest version equivalent to the above would be   if  c  amp  amp   c 0       printf  c is empty n

User · Answer

Check the pointer for NULL and then using strlen to see if it returns 0  NULL check is important because passing NULL pointer to strlen invokes an Undefined Behavior

User · Answer

if    ptr       empty string        similarly  if   ptr        not empty

User · Answer

I would prefer to use the strlen function as library functions are implemented in the best way   So  I would write    if strlen p   0     Empty string

User · Answer

My preferred method   if   ptr    0     empty string   Probably more common   if  strlen ptr     0     empty string

[c] How can I check if char* variable points to empty string?

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