#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 = 1.8;
    [[Person new] print];
    return 0;
}
执行一次Person new方法就创建一个对象，内存中就开辟一个区域，故输出为0.000000

#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 = 1.8;
    [[Person new] print];
    return 0;
}
执行一次Person new方法就创建一个对象，内存中就开辟一个区域，故输出为0.000000