第7题思考&实现 - 黑马程序员技术交流社区

#import <Foundation/Foundation.h>
/**
* Person类，年龄_age,体重_weight;
*/
@interface Person : NSObject
{
@public
int _age;
float _weight;
}
-(void)eat;
-(void)walk:(int)step;
@end
@implementation Person
-(void)eat{
_weight+=0.6;
}
-(void)walk:(int)step{
_weight = _weight-(step/100)*0.2;
}
@end
int main(int argc, const char * argv[]) {
@autoreleasepool {
Person *per=[Person new];
per->_age = 23;
per->_weight=60;
//调用方法
[per eat];
[per walk:500];
NSLog(@"age = %d",per->_age);
NSLog(@"weight = %0.2f",per->_weight);
}
return 0;
}

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刚刚完成第7题！

//
// main.m
// 第二题
//2.设计一个”狗“类
//1> 属性
//* 颜色
//* 速度(单位是m/s)
//* 性别
//* 体重(单位是kg)
//2>行为
//* 吃:每吃一次,体重增加0.5kg,输出吃完后的体重
//* 吠(叫):输出所有的属性
//* 跑:每吃一次,体重减少0.5kg,输出速度和跑完后的体重
//* 比较颜色:跟别的狗比较颜色,如果一样,两个值做减法得零,返回NO(零值),不一样,
//做减法得到非零值,返回YES(1)
//* 比较速度:跟别的狗比较速度,返回速度差(自己的速度 - 其他狗的速度)
// Created by mac on 15/9/10.
//
#import <Foundation/Foundation.h>
#pragma mark 枚举狗的颜色
typedef enum Color {kWhite,kBlack,kYellow}dogColor;
#pragma mark "狗"类的声明
//1> 属性
@interface Dog : NSObject
{
@public
dogColor _color;
float _speed;
NSString * _sex;
float _weight;
}
//2> 行为
-(void)eat:(int)_time;
-(void)bark;
-(void)run:(int)_time2;
-(int)compare:(dogColor)_color2;
-(int)compare2:(float)_speed2;
@end
#pragma mark "狗"类的实现
@implementation Dog
//3> 实现
-(void)eat:(int)_time
{
_weight += (0.5)*_time;
NSLog(@"吃完后的体重:%.2f",_weight);
}
-(void)bark
{
NSLog(@"颜色:%d,速度:%.2fm/s,性别:%@,体重:%.2fkg",_color,_speed,_sex,_weight);
}
-(void)run:(int)_time2
{
_weight -= (0.5)*_time2;
NSLog(@"跑完后的体重:%.2fkg",_weight);
}
-(int)compare:(dogColor)_color2
{
if (0 == (_color) - (_color2)) {
BOOL flag = NO;
NSLog(@"结果为%d,则跟别的狗颜色一样",flag);
}else{
BOOL flag = YES;
NSLog(@"结果为%d,则跟别的狗颜色不一样",flag);
}
return 0;
}
-(int)compare2:(float)_speed2
{
float chaZhi = _speed - _speed2;
NSLog(@"跟别的狗的速度差为:%.2f",chaZhi);
return 0;
}
@end
#pragma mark -
#pragma mark 添加人类
@interface Person : NSObject
{
@public
NSString *_personName;
Dog *_dog;
}
-(void)giveFood:(int)_time;
-(void)walkDog:(int)length;
@end
@implementation Person
/**
* 喂食
*/
-(void)giveFood:(int)_time{
[_dog eat:_time];
}
/**
* 遛狗
*
* @param length 多少米
*/
-(void)walkDog:(int)length{
[_dog run:length];
}
@end
#pragma mark _
int main(int argc, const char * argv[]){
@autoreleasepool {
Dog *dog =[Dog new];
dog ->_color = kBlack;
dog ->_sex = @"公的";
dog ->_speed = 6.02;
dog ->_weight= 40;
[dog eat:2];
[dog bark];
[dog run:2];
[dog compare:kWhite];
[dog compare2:5.01];
//这边是人类出现之后，将dog传入
Person *per=[Person new];
per->_personName=@"张三";
per->_dog=dog;
[per walkDog:2];
[dog bark];
}
return 0;
}

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