1st round Phone Screen

永远自由的心

1. Race condition, read and write lock, semaphone
https://en.wikipedia.org/wiki/Race_condition

2. ARC vs Garbage Collection
; E" h$ @2 v6 B. T. g3 \- ahttps://docs.elementscompiler.com/Concepts/ARCvsGC/
http://programmers.stackexchange ... -reference-counting
5 q3 p7 G7 {' W4 b1 j
3. Abstract Class, Interface
https://docs.oracle.com/javase/tutorial/java/IandI/abstract.html
2 D4 J  d% ]; i$ I2 L
/ K. ?  [: t! @2 T4. Protocol, Interface in Objective C
http://stackoverflow.com/questio ... col-versus-category

; q2 }* X5 c2 d; e$ d8 F1 n1 g/ s: f5. Write a function that returns 1 when receives 2 and returns 2 when receives 1; No if statements allowed, switch or ?:

- s& x; A- Q) L' ^#include <stdio.h>
7 M4 e% G- k0 r- c' y/ M. o
int functionTest(int argument) {
  int x = argument - 1;
# l2 i" u/ J5 `  
6 T; r+ D( o+ q, p3 s0 Q. s! f* H  return (x ^ 1) + 1;
}

1 r. T" h. Q( _( h8 |. gint main() {
! x0 E# A* {) f4 \' E& r7 \  printf("should be 2 - %d\n", functionTest(1));
, D, m) A2 b% N  printf("should be 1 - %d", functionTest(2));
  
  return 0;
, B9 v, T: E- H* k- L5 G  h}
; G4 |0 f) m6 x; N

xiaobai

感谢永远自由的心分享~~~

Ada.Zhang

感谢永远自由的心分享~~~好人一生平安~~~