Question

struct list{
   char *Name;
};

void chekFC(struct list *newList){
  char *fC = newList->Name;
  printf("%s\n", &fC);                   //I can print it
  if(fC[0] == '+')                       //Any error??
  printf("Yes");
}

int main(){
   struct list *newList = (struct list *)malloc(sizeof(struct list));
   newList->Name = "+abc";
   chekFC(newList);
}

it can run, if I change the code to following

void chekFC(struct list *newList){
  char *fC = newList->Name;
  printf("%s\n", &fC);                   //I can print it
  if(fC[0] == '+')  {}                     // Add {}  nothing run in the if condition, than the program can run
  printf("Yes");
}

Why this program cannot run? The error is Segmentation fault (core dumped)

Answer 1

there have one problem in you code.

printf("%s\n", &fC);

you should change it to

printf("%s\n", fC);

I think you don’t understand the C pointer very clearly.
the &fC is very different from fC, you can print it by “%p” to see it.

printf("fC %p, &fC %p\n", fC, &fC);

&fC is address of fC,
fC is address of string of “+abc”.
I want it can help you, but I suggest you should read some book, to learn C pointer.