OC入门之类与对象的实例 - 黑马程序员技术交流社区

#import <Foundation/Foundation.h>
//定义狗类
@interface Dog : NSObject
{
@public;
NSString *_color;//颜色
int _speed;//速度
NSString *_sex;//性别
float _weight;//体重
}
-(void)eat:(float *)weight;//吃饭
-(void)bark:(NSString *)color and:(int)speed and:(NSString *)sex and:(float) weight;//叫
-(void)run:(int)speed and:(float *)weight;//跑步
+(int)compareColor:(NSString *)dogColorOne and :(NSString *)dogColorTwo;//比较两个狗的颜色
+(int)compareSpeed:(int)dogSpeedOne and :(int)dogSpeedTwo;//比较两个狗的速度
@end
@implementation Dog
//狗每吃一次体重就增加0.5kg,输出吃完后的体重
-(void)eat:(float *)weight{
*weight += 0.5f;
NSLog(@"吃完饭后体重为:%.1fkg",*weight);
}
//狗叫,输出所有狗的属性
-(void)bark:(NSString *)color and:(int)speed and:(NSString *)sex and:(float) weight{
NSLog(@"狗的颜色是:%@,速度是:%dm/s,性别是:%@,体重是:%.1fkg",color,speed,sex,weight);
}
//狗每跑步一次体重就减少0.5kg,输出跑步速度及跑步后的体重
-(void)run:(int)speed and:(float *)weight{
*weight -= 0.5f;
NSLog(@"吃完饭后体重为:%.1fkg,速度为:%dm/s",*weight,speed);
}
//比较两个狗的颜色,颜色一样返回YES,不一样返回NO
+(int)compareColor:(NSString *)dogColorOne and :(NSString *)dogColorTwo{
if (0 == (((int)dogColorOne) - ((int)dogColorTwo))) {
NSLog(@"两个狗的颜色一样");
return YES;
}
NSLog(@"两个狗的颜色不一样");
return NO;
}
//比较两个狗的速度,返回速度差
+(int)compareSpeed:(int)dogSpeedOne and :(int)dogSpeedTwo{
if (dogSpeedOne > dogSpeedTwo) {
return dogSpeedOne-dogSpeedTwo;
}
return dogSpeedTwo-dogSpeedOne;
}
@end
int main(){
@autoreleasepool {
// 创建两个狗对象
Dog *dogOne = [Dog new];
Dog *dogTwo = [Dog new];
// 分别给两个狗的属性赋值
dogOne->_color = @"白色";
dogTwo->_color = @"黑色";
dogOne->_sex = @"公狗";
dogTwo->_sex = @"母狗";
dogOne->_speed = 20;
dogTwo->_speed = 18;
dogOne->_weight = 35.0f;
dogTwo->_weight = 33.3f;
// 狗叫
[dogOne bark:dogOne->_color and:dogOne->_speed and:dogOne->_sex and:dogOne->_weight];
// 狗吃一顿饭
[dogOne eat:&(dogOne->_weight)];
// 狗跑步
[dogOne run:dogOne->_speed and:&(dogOne->_weight)];
// 比较两个狗的颜色
int a = [Dog compareColor:dogOne->_color and:dogTwo->_color];
NSLog(@"%d",a);
// 比较两个狗的速度
int difSpeed = [Dog compareSpeed:dogOne->_speed and:dogTwo->_speed];
NSLog(@"两个狗的速度差为:%dm/s",difSpeed);
}
return 0;
}

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