1 Technically speaking, its defined in the file
NSObjCRuntime.h, which is imported from inside the file
2 Note the use of the strings
"A string to be copied." and
"So is this." in the program. These are not string objects, but C-style character strings, as distinguished by the fact that an
@ character does not precede the string. The two types are not interchangeable. If a function expects an array of char as an argument, you may pass it either an array of type
char or a literal C-style character string, but not a character string object.
unichar characters occupy 16 bits, but the Unicode standard provides for characters larger than ...