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1. Race condition, read and write lock, semaphone 3 z" f6 i" P7 O6 O8 g' @
https://en.wikipedia.org/wiki/Race_condition+ ?# x' C; W: A- m) p; Y- V
+ A3 d8 T5 q) p% Z$ I" U6 C U2. ARC vs Garbage Collection& Z9 s) N8 Q, c9 {0 ?
https://docs.elementscompiler.com/Concepts/ARCvsGC/2 l; |/ z/ a: ~/ t2 O
http://programmers.stackexchange ... -reference-counting, t) [/ L4 ^& ]! I, ?4 K
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3. Abstract Class, Interface
7 q: _3 `4 T" `* x* X9 N$ [/ s/ `https://docs.oracle.com/javase/tutorial/java/IandI/abstract.html# ~/ i! u$ b4 ~/ `4 l
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4. Protocol, Interface in Objective C! V6 q* A4 s6 A5 r& j0 M( i
http://stackoverflow.com/questio ... col-versus-category$ u' ~' |7 W# W( v% D
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5. Write a function that returns 1 when receives 2 and returns 2 when receives 1; No if statements allowed, switch or ?:# w6 O' H& x- H: N3 w. k% ]
. `4 e$ _4 S/ ?#include <stdio.h>
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int functionTest(int argument) {2 L; H1 j$ F+ k3 Z4 h9 U( R. Q/ s
int x = argument - 1;
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return (x ^ 1) + 1;7 g% f o7 {2 h
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. Z' Z5 _3 P5 o! K( N1 @0 ^" R' f! sint main() {; e3 V; x( {$ e8 R6 N7 I6 c: }
printf("should be 2 - %d\n", functionTest(1));
0 I+ X4 ~2 Y6 O9 n( R0 T- n printf("should be 1 - %d", functionTest(2));
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$ u8 y7 }9 Y& o: m' I return 0;( M' T4 F& \8 j; z' }+ I
}
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