八進制格式化輸出

NSLog(@"%o",15);
NSLog(@"%#o",15)

輸出
2016-04-12 23:36:14.093 MyTest[43037:539029] 17
2016-04-12 23:36:14.094 MyTest[43037:539029] 017

十六進制格式化輸出

NSLog(@"%x",15);
NSLog(@"%#x",15);

輸出
2016-04-12 23:36:14.094 MyTest[43037:539029] f
2016-04-12 23:36:14.094 MyTest[43037:539029] 0xf