Pointers and Arrays on C related Questions and Answers

Question :   What type of initialization is needed for the segment 'ptr[3] = '3';' to work? 1. char *ptr = “Hello!”; 2. char ptr[] = “Hello!”; 3. both char *ptr = “Hello!”; and char ptr[] = “Hello!”; 4. none of the mentioned Answer :   2 - char ptr[] = “Hello!”;