Objective-c wrong question

1,

NSString *name = [[NSString alloc]initwithstring:@ "Zhang San"];

NSLog (@ "%d", [name Retaincount]);

2014-11-27 20:43:20.290 OC Exam wrong question [1750:303]-1

2,

nsstring* testobject = [[NSData alloc] init];

Compile-time, nsstring type, run-time, NSData type

3,

Nsarray * (^ablock) (NSString * str,nsstring *str2);

Declares a block type variable with a return value of Nsarray and a two string object

4,

Nsmutabledictionary * dic = [[Nsmutabledictionary alloc] initwithobjectsandkeys:@ "1", @ "2", @ "2", @ "3", @ "3", @ "4", nil];

Nsarray *arr = [[Nsarray alloc] initwitharray:[dic AllKeys]];

NSString *str = [[NSString alloc] Initwithformat:[arr objectatindex:0],[arr Objectatindex:1],[arr ObjectAtIndex:2]];

NSLog (@ "%@", str);

2014-11-27 20:47:22.678 OC Exam wrong question [1761:303] 2

5,

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

NSString *sstr = [NSString stringwithformat:@ "abc"];

NSString *STR2 = [sstr retain];

[Pool release];

NSLog (@ "Sstr Retaincount =%ld,str2 Retaincount =%ld", [Sstr retaincount],[str2 retaincount]);

Sstr Retaincount = 1,str2 Retaincount = 1

6,

Nsmutabledictionary * Dic1 = [[Nsmutabledictionary alloc] initwithobjectsandkeys:@ "1", @ "2", @ "1", @ "3", @ "1", @ "4", nil];

Nsarray *arr1 = [[Nsarray alloc] Initwitharray:[dic1 AllKeys]];

Nsarray *ARR2 = [[Nsarray alloc] Initwitharray:[dic1 allvalues]];

Nsmutabledictionary *dic2 = [[Nsmutabledictionary alloc] initwithobjects:arr1 FORKEYS:ARR2];

NSLog (@ "%@", Dic2);

1 = 4;

7, replace @ "2B youth" with @ "literary youth"

Nsrange Range1 = {0,2};

[@ "2B Youth" Stringbyreplacingcharactersinrange:range1 withstring:@ "literary"];

8,

Nsmutabledictionary * dic3 = [[Nsmutabledictionary alloc] initwithobjectsandkeys:@ "1", @ "2", @ "2", @ "3", @ "3", @ "4", nil];

[Dic3 setobject:@ "1" forkey:@ "3"];

[Dic3 removeobjectforkey:@ "1"];

NSLog (@ "%@", DIC3);

2 = 1;3 = 1;4 = 3;

9, in the class method, the instance variable can be used by BU.

10, instance objects are generated by invoking a class method.

return 0;

Objective-c wrong question