Solutions to selected problems for the Exam 2 Review

• notes.h
• queue.h
• Answers for the strcat and strcpy problems:
  • strcpy(s, "abc"); printf("%s", s); - prints abc (nothing tricky about this one)
  • strcpy(s, "crush"); printf("%s", s); - undefined; s has just 5 characters allocated, so it is not clear what would happen with the '\0' at the end of "crush". If it overwrites some critical piece of data, the program could crash.
  • strcpy(s, "abc"); strcpy(&s[1], "def"); printf("%s", s); - prints adef since this copies def on top of bc.
  • strcpy(s, "abc"); strcat(s, "x"); printf("%s", s); - prints abcx (nothing tricky)
  • strcpy(s, "ab"); strcat(s, s); printf("%s", s); - undefined; since s is being extended while copying itself to its "tail", it is possible that this operation will never end until the processor reaches the end of memory.
  • strcpy(s, "abc"); printf("%d", strcmp("abc", s)); - prints 0 since they are the same
  • strcpy(s, "abc"); printf("%d", strcmp("def", s)); - partially undefined; it could be 1 since 'd' is after 'a', but it could also be any other positive integer.