[学习交流] 对象的操作

//
//  main.m
//  对象的操作，对象作函数参数
//
//  Created by herobin on 15/12/20.
//  Copyright © 2015年 herobin. All rights reserved.
//第1题：对象的操作、对象作为函数参数
/*
#import <Foundation/Foundation.h>
@interface Person : NSObject
{
@public
int age;
double height;
}
- (void)print;
@end

void test1(int newAge, double newHeight);
void test2(Person *newP);
void test3(Person *newP);
void test4(Person *newP);

int main()
{
Person *p = [Person new];
p->age = 10;
p->height = 1.5f;

test1(p->age, p->height);
[p print];//10 1.5f

test2(p);             //newP指向p，所以p->age=20;p->1.7
[p print];//20 1.7f

test3(p);
[p print];//20 1.7f    //newP指向p，函数内部新定义一个p2，最后newP=p2；所以没有改变p

test4(p);
[p print];//60 1.9f    //newP指向p，函数内部新定义一个p2指向newP,所以p2=p；所以newP和p2都会改变p

return 0;
}

@implementation Person
- (void)print
{
NSLog(@"年龄=%d，身高=%f", age, height);
}
@end

void test1(int newAge, double newHeight)
{
newAge = 10;
newHeight = 1.6;
}

void test2(Person *newP)
{
newP->age = 20;
newP->height = 1.7;
}

void test3(Person *newP)
{
Person *p2 = [Person new];
p2->age = 40;
p2->height = 1.8;
newP = p2;

newP->age = 30;
}

void test4(Person *newP)
{
Person *p2 = newP;
p2->age = 50;
p2->height = 1.9;
newP->age = 60;
}
*/
//第2题：匿名对象
#import <Foundation/Foundation.h>
@interface Person : NSObject
{
@public
int age;
double height;
}
- (void)print;
@end

@implementation Person
- (void)print
{
NSLog(@"年龄=%d，身高=%f", age, height);
}
@end

int main()
{
[Person new]->age = 10;
[Person new]->height = 1.8f;
[[Person new] print];
return 0;
}

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[学习交流] 对象的操作

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