Struct и всё что с этим связанно

  struct MultiTarget {
    const char *str;  // string you're searching for
    size_t len;       // length of string you're searching for
    size_t index;     // index used by the search routine.
  } ;
MultiTarget t[1] = {{OK, strlen(OK), 0}};
int main()

  struct MultiTarget {
    const char *str;  // string you're searching for
    size_t len;       // length of string you're searching for
    size_t index;     // index used by the search routine.
  } t;
t[1] = {{OK, strlen(OK), 0}};   //так не хочет
t = {OK, strlen(OK), 0};        //так тоже
int main()

  struct MultiTarget {
    const char *str;  // string you're searching for
    size_t len;       // length of string you're searching for
    size_t index;     // index used by the search routine.
  } t;
int main(){
t = {OK, strlen(OK), 0}; }

int findMulti( struct MultiTarget *targets, int tCount) {
for (struct MultiTarget *t = targets; t < targets+tCount; ++t) {}
}

volatile struct A {};
 
struct A volatile {};
 
struct A {} volatile a;
 
struct A {} a volatile;

struct A {};
volatile A a;

volatile struct A {};   // так нет
volatile struct A {} a; // ок

struct A {} volatile a;

volatile struct {} a;

volatile struct {} a;
struct {} volatile a;