OC 函数的使用

#import <Foundation/Foundation.h>@interface Person :NSObject{    @public    char *_name;    int _age;}-(void) say:(NSString *) words;@end@implementation Person-(void) say:(NSString *) words{    NSLog(@"%@",words);}void changeAge(Person *person){    person ->_age = 10;    [person say:@"hello tom"];}@endint main(int argc, const char * argv[]){    @autoreleasepool {        Person *person = [Person new];        person->_age = 1;        changeAge(person);        NSLog(@"age=%d",person->_age);    }    return 0;}