摘要：
#import #import "Person.h"#import "Dog.h"int main(int argc, const char * argv[]) { @autoreleasepool { Person *xw = [[Person alloc] init]; Person *zs =... 阅读全文
摘要：
用一段程序来说明：#import int main(int argc, const char * argv[]) { @autoreleasepool { int age = 20; int height = 170; /*NSString //1.静态 alloc new copy mutabl... 阅读全文