Array subscript has type ‘char’ [-Wchar-subscripts]

Question

I am trying to remove leading/trailing whitespace characters with help below helper function. When compiling i am getting warning: array subscript has type ‘char’ [-Wchar-subsc

Answer 1

-Wchar-subscripts : Warn if an array subscript has type char

Example code which produces above warning.

#include
int main()
{
int a[10]; //or even char a[10];
char c=5;
printf("%d",a[c]); //you might used like this in your code array with character subscript
return 0;
} 

In your code(Which is not posted), You might used char subscript As Like above.

Example of main which produces the -Wchar-subscripts warning in your code:

int main()
{
        char c=20;
        char   s[c];
        printf("Enter string:");
        fgets(s,sizeof(s),stdin);
        printf("String before removal of spaces : \n%s",s);
        printf("%c",s[c]);  //accessing s[c],array element with char subscript or else any Expression you might used this
        printf("test text\n");
        strcpy(s,removeSpace(s));
        printf("String after removal of spaces : \n%s",s);
        printf("test text\n");
        return 0;
}

But there is No char subscript , in the code which you have posted. tested your code by adding main. did not reproduce any warning or error.I did compilation with gcc -Wall -Werror file.c .

if you still did not figure , post your whole code.

test Code Which did not produce any warnings and errors:

#include
#include
#include  //included this to use isspace
char *removeSpace(char *);

char *removeSpace(char *str )
  {
     char *end;

     // Trim leading space
     while(isspace(*str))
     str++;

    if(*str == 0)  // All spaces?
    return str;

   // Trim trailing space
   end = str + strlen(str) - 1;
   while(end > str && isspace(*end)) end--;

   // Write new null terminator
   *(end+1) = 0;

   return str;
 }


int main()
{
        char  s[20];
        printf("Enter string:");
        fgets(s,sizeof(s),stdin);
        printf("String before removal of spaces : \n%s",s);
        printf("test text\n");
        strcpy(s,removeSpace(s));
        printf("String after removal of spaces : \n%s",s);
        printf("test text\n");
        return 0;
}