Use the example to tell you the OC pointer parameter

First write a person class Person.h

1 #import<Foundation/Foundation.h>2 3 @interfacePerson:nsobject4 {5 @public6     intAge ;7     Doubleheight;8 }9- (void) print;Ten  One @end

Person.m

 1   #import   " person.h   " 2  @ Implementation   person  4 -(void   5  { @"   age =%d, height =%f   "  7   8   @end 
  

Main.m

1 #import<Foundation/Foundation.h>2 #import "Person.h"3 voidTest1 (intNewAge,Doublenewheight);4 voidTest2 (Person *NEWP);5 voidTEST3 (Person *NEWP);6 voidTEST4 (Person *NEWP);7 8 intMainintargcConst Char*argv[]) {9 @autoreleasepool {TenPerson *p = [personNew]; OneP->age =Ten; AP->height =1.5f; -          -Test1 (P->age, p->height); the[P print];//Ten 1.5 -          -Test2 (P);//1.7 - [P print]; +NSLog (@"before = aft%@", p); -Test3 (P);//1.7 + [P print]; ANSLog (@"After =%@", p); at          -Test4 (P);//1.9 - [P print]; -          -     } -     return 0; in } -  to voidTest1 (intNewAge,Doublenewheight) + { -NewAge =Ten; theNewheight =1.6; * } $ Panax Notoginseng voidTest2 (Person *NEWP) - { theNewp->age = -; +Newp->height =1.7; A } the  + voidTEST3 (Person *NEWP) - { $NSLog (@"just passed in parameter address NEWP =%@", NEWP); $Person *P2 = [personNew];//P2 point to a new storage space -P2->age = +; -P2->height =1.8; theNEWP = p2;//point the new storage space of P2 to newp here the change just changes the contents of the P2 without making changes to the address NEWP originally pointed to -NSLog (@"NEWP Changed address =%@", NEWP);WuyiNewp->age = -; the } -  Wu voidTEST4 (Person *NEWP) - { AboutPerson *p2 = NEWP;//Assigning a NEWP address to P2 and then making changes to the P2 content is actually equivalent to changing the contents of the NEWP $P2->age = -; -P2->height =1.9; -Newp->age = -; -}

Operation Result:

2015-06-30 11:11:43.933 test[40776:1124334] Age =10, height =1.500000

2015-06-30 11:11:43.934 test[40776:1124334] Age =20, height =1.700000

2015-06-30 11:11:43.934 test[40776:1124334] before = aft<person:0x100211ba0>

2015-06-30 11:11:43.935 test[40776:1124334] just passed in parameter address NEWP = <Person:0x100211ba0>

2015-06-30 11:11:43.935 test[40776:1124334] NEWP changed address = <Person:0x100100330>

2015-06-30 11:11:43.935 test[40776:1124334] Age =20, height =1.700000

2015-06-30 11:11:43.935 test[40776:1124334] after = <Person:0x100211ba0>

2015-06-30 11:11:43.935 test[40776:1124334] Age =60, height =1.900000

Use the example to tell you the OC pointer parameter