NSMutableString * s = [[NSMutableString alloc] initWithFormat:@"hello"];
NSLog(@"s = %p",s);
[s appendFormat:@"world"];
NSLog(@"s = %p",s);
上述代码两次打印地址的值是否相同( )
2022-02-21 15:50:31.756681+0800 DemoOC[41971:633793] s = 0x6000020f1f20