笔试坑录

1.下列输出是什么?(个人尝试bad_access。。。有人解答吗？）

    NSString *text = @"info";
    memset((__bridge void *)(text), 0, text.length-1);
    NSString *myString = [NSString stringWithFormat:@"info"];
    NSLog(@"%@",myString);

2.ios c函数如何hook?（不懂）

3.写一个NSString类的实现

+ (id)initWithCString:(const char *)nullTerminatedCString encoding:(NSStringEncoding)encoding;

+ (id) stringWithCString: (const char*)nullTerminatedCString 
            encoding: (NSStringEncoding)encoding
{
  NSString  *obj;
  obj = [self allocWithZone: NSDefaultMallocZone()];
  obj = [obj initWithCString: nullTerminatedCString encoding: encoding];
  return AUTORELEASE(obj);
}

4.oc冒泡排序(忘记如何排序了-.0)

笔试坑录

原文：http://www.cnblogs.com/imhere/p/4342801.html