#import<Foundation/Foundation.h>

@interface Autobus : NSObject
{
    @public
    int wheels;
    float speed;
}
-(void)run;
-(void)stop;

@end

@implementation Autobus

-(void)run

{
    NSLog(@"汽车运行了。。。,现在速度是%.1f",speed);
}

-(void)stop

{
    NSLog(@"汽车停止了。。。");
}


@end

int main()
{
    Autobus* audi=[Autobus new];
    audi->wheels=4;
    audi->speed=300;
    [audi run];
    [audi stop];
    audi->speed=500;
    [audi run];
    [audi stop];
    Autobus* toyota=[Autobus new];
    toyota->wheels=4;
    toyota->speed=200;
    [toyota run];
    [toyota stop];
    return 0;
}

感谢分享