成员变量

Student.h:

#import <Foundation/Foundation.h>  @interface Student : NSObject{     //    @public     //    @private     //    @protected     //y一般默认的情况是@protected     int age;     @private     int no;     @public     float height; } //-(void) age; @property(nonatomic,assign) int age; @end 

Student.m:

#import "Student.h"  @implementation Student  @end

GoodStudent.h:

#import "Student.h"  @interface GoodStudent : Student  @end 

GoodStudent.m:

#import "GoodStudent.h"  @implementation GoodStudent -(void) test{     age=10;     //no=9;     height=0.1f; } @end 

main:

#import <Foundation/Foundation.h> #import "Student.h" int main(int argc, const char * argv[]) {      @autoreleasepool {                  Student *stu=[[[Student alloc] init] autorelease];         //点语法不是访问成员变量，是访问get和set方法         stu.age=10;         //通过get方法调用成员变量         NSLog(@"age is %i",stu.age);         //这样才是访问@public成员变量         stu->height=10.9f;         NSLog(@"height is %.1f",stu->height);              }     return 0; }

结果：

2013-08-02 15:12:25.051 成员变量[988:303] age is 10

2013-08-02 15:12:25.072 成员变量[988:303] height is 10.9