Warning comparison between pointer and integer

Question

I am getting a warning when I iterate through the character pointer and check when the pointer reaches the null terminator     const char  message    hi       I then loop through the message and I get an error in the below if statement    if   message      0            do something      The error I am getting is    warning  comparison between pointer and integer         int  and  char       I thought that the   in front of message dereferences message  so I get the value of where message points to  I do not want to use the library function strcmp by the way

User · Answer

In this line      if   message      0           as you can see in the warning       warning  comparison between pointer and integer         int  and  char           you are actually comparing an int with a char    or more specifically  an int with an address to a char   To fix this  use one of the following   if  message      0       if message 0       0       if   message        On a side note  if you d like to compare strings you should use strcmp or strncmp  found in string h

User · Answer

This    0  is a string  not a character   A character uses single quotes  like   0

User · Answer

It should be  if   message      0     In C  simple quotes delimit a single character whereas double quotes are for strings

[c] Warning comparison between pointer and integer

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Examples related to null-terminated