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��虫 — Wed, 09 Feb 2011 09:06:00 GMT

要不是因为哥哥在�|�上搜到�q�个博客�Q�我�q�乎�Q�已�l�）忘记了它的存在，当哥哥把貌似熟悉的文字发�l�我看时�Q�惊喜和温柔�Q�不能完全描�q�我的当时的心情。即使是现在�Q�仍然能感受到这�U�欢�ƣ和被爱的快乐�?br>
�q�个新年�Q�在哥哥每日早上的问候，和马普尔��姐的乡村生�z�M��Q��E淡的度过。和哥哥在一��L��日子�Q�完全可以不需要网�l�的存在�Q�只和对方相��_��都能有着无比�_�ֽ�和丰富的生活�?br>
�|�络聊天的工��P��p��它慢慢��E出我的生�z�d��Q�也未尝不是一个新的开始�?br>
最�q�在看Java版的数据�l�构和一些Android的知识，在这里，重新开辟一个小天地吧。For both of us, only love that matters……

��虫 2011-02-09 17:06 发表评论

c++中struct和c中struct的不�?

��虫 — Fri, 20 Jan 2006 03:57:00 GMT

1. C++的函数可以放在strcut内部作�ؓ“成员函数”�?BR>
2.   C++�~�译器将�l�构名�{变�ؓ一个新的类型名�Q�如int,char,float和double是类型名一��P��

3.   在下面的C版本的struct的函��C��Q�硬性传递结构的地址作�ؓ�q�些函数的第一个参数。例如：
           typedef struct CstashTag{
               int size;             //size of each space
               //.........
           } Cstash;
           void initialize(CStash *s, int size);

      而C++中则不是�Q�这一�q�程是由�~�译器来完成�?BR>           struct Stash {
               int size;            //size of each space
               //.........
               void initialize(int size);
          };

��虫 2006-01-20 11:57 发表评论

求职�W�试题[转]

��虫 — Fri, 20 Jan 2006 02:23:00 GMT

华�ؓ�W�试�?BR>         1�Q�请你分别画出OSI的七层网�l�结构图和TCP/IP的五层结构图�?BR>　　2�Q�请你详�l�地解释一下IP协议的定义，在哪个层上面�Q�主要有什么作用？TCP与UDP呢？
　　3�Q�请问交换机和�\由器各自的实现原理是什么？分别在哪个层�ơ上面实现的�Q?BR>　　4�Q�请问C++的类和C里面的struct有什么区别？
　　5�Q�请讲一讲析构函数和虚函数的用法和作用�?BR>　　6�Q�全局变量和局部变量有什么区别？是怎么实现的？操作�pȝ��和编译器是怎么知道的？
　　7�Q?086是多��位的系�l�？在数据�ȝ��上是怎么实现的？

联想�W�试�?BR>         1�Q�设计函�?int atoi(char *s)�?BR>　　2�Q�int i=(j=4,k=8,l=16,m=32); printf(�?d�? i); 输出是多��？
　　3�Q�解释局部变量、全局变量和静态变量的含义�?BR>　　4�Q�解释堆和栈的区别�?BR>　　5�Q�论�q�含参数的宏与函数的优缺�?/FONT>

普天C++�W�试�?BR>         1�Q�实现双向链表删除一个节点P�Q�在节点P后插入一个节点，写出�q�两个函数�?BR>　　2�Q�写一个函敎ͼ��其中的\t都�{换成4个空根{�?BR>　　3�Q�Windows�E�序的入口是哪里�Q�写出Windows消息机制的流�E��?BR>　　4�Q�如何定义和实现一个类的成员函��Cؓ回调函数�Q?BR>　　5�Q�C++里面是不是所有的动作都是main()引�v的？如果不是�Q�请举例�?BR>　　6�Q�C++里面如何声明const void f(void)函数为C�E�序中的库函敎ͼ�
　　7�Q�下列哪两个是等同的
　　int b;
　　A const int* a = &b;
　　B const* int a = &b;
　　C const int* const a = &b;
　　D int const* const a = &b;
　　8�Q�内联函数在�~�译时是否做参数�c�d��查？
　　void g(base & b){
　　 b.play;
　　}
　　void main(){
　　 son s;
　　 g(s);
　　 return;
　　}

1. How do you code an infinite loop in C?
　　2. Volatile:
　　�Q?�Q�What does the keyword volatile mean? Give an example
　　�Q?�Q�Can a parameter be both const and volatile? Give an example
　　�Q?�Q�Can a pointer be volatile? Give an example
　　3. What are the values of a, b, and c after the following instructions:
　　int a=5, b=7, c;
　　c = a+++b;
　　4. What do the following declarations mean?
　　�Q?�Q�const int a;
　　�Q?�Q�int const a;
　　�Q?�Q�const int *a;
　　�Q?�Q�int * const a;
　　�Q?�Q�int const * a const;
　　5. Which of the following statements describe the use of the keyword static?
　　�Q?�Q�Within the body of a function: A static variable maintains its value between function revocations
　　�Q?�Q�Within a module: A static variable is accessible by all functions within that module
　　�Q?�Q�Within a module: A static function can only be called by other functions within that module
　　6. Embedded systems always require the user to manipulate bits in registers or variables. Given an integer variable a, write two code fragments.
　　The first should set bit 5 of a. The second shnuld clear bit 5 of a. In both cases, the remaining bits should be unmodified.
　　7. What does the following function return?
　　char foo(void)
　　{
　　 unsigned int a = 6;
　　 iht b = -20;
　　 char c;
　　 (a+b > 6) ? (c=1): (c=0);
　　 return c;
　　}
　　8. What will be the output of the following C code?
　　main()
　　{
　　 int k, num= 30;
　　 k =(num > 5 ? (num <=10 ? 100:200): 500);
　　 printf(�?d�? k);
　　}
　　9. What will the following C code do?
　　int *ptr;
　　ptr =(int *)Ox67a9;
　　*ptr = Oxaa55;
　　10. What will be the output of the follow C code?
　　#define product(x) (x*x)
　　main()
　　{
　　 int i = 3, j, k;
　　 j = product(i++);
　　 k = product(++i);
　　 printf(�?d %d�?j,k);
　　}
　　11. Simplify the following Boolean expression
　　!((i ==12) || (j > 15))
　　12. How many flip-flop circuits are needed to divide by 16?
　　13. Provides 3 properties that make an OS, a RTOS?
　　14. What is pre-emption?
　　15. Assume the BC register value is 8538H, and the DE register value is 62A5H.Find the value of register BC after the following assembly operations:
　　MOV A,C
　　SUB E
　　MOV C,A
　　MOV A,B
　　SBB D
　　MOV B,A
　　16. In the Assembly code shown below
　　LOOP: MVI C,78H
　　 DCR C
　　 JNZ LOOP
　　 HLT
　　How many times is the DCR C Operation executed?
　　17. Describe the most efficient way (in term of execution time and code size) to divide a number by 4 in assembly language
　　18. what value is stored in m in the following assembly language code fragment if n=7?
　　 LDAA #n
　　LABEL1: CMPA #5
　　 BHI L3
　　 BEQ L2
　　 DECA
　　 BRA L1
　　LABEL2: CLRA
　　LABEL3: STAA #m
　　19. What is the state of a process if a resource is not available?
　　#define a 365*24*60*60
　　20. Using the #define statement, how would you declare a manifest constant that returns the number of seconds in a year? Disregard leap years in your answer.
　　21. Interrupts are an important part of embedded systems. Consequently, many compiler vendors offer an extension to standard C to support interrupts. Typically, the keyword is __interrupt. The following routine (ISR). Point out problems in the code.
　　__interrupt double compute_area (double radius)
　　{
　　 double area = PI * radius * radius;
　　 printf(“\nArea = %f�? area);
　　 return area;
　　}

�l�尔VERITAS软�g�W�试�?/FONT>
　　1. A class B network on the internet has a subnet mask of 255.255.240.0, what is the maximum number of hosts per subnet .
　　a. 240 b. 255 c. 4094 d. 65534
　　2. What is the difference: between o(log n) and o(log n^2), where both logarithems have base 2 .
　　a. o(log n^2) is bigger b. o(log n) is bigger
　　c. no difference
　　3. For a class what would happen if we call a class’s constructor from with the same class’s constructor .
　　a. compilation error b. linking error
　　c. stack overflow d. none of the above
　　4. “new�?in c++ is a: .
　　a. library function like malloc in c
　　b. key word c. operator
　　d. none of the above
　　5. Which of the following information is not contained in an inode .
　　a. file owner b. file size
　　c. file name d. disk address
　　6. What’s the number of comparisons in the worst case to merge two sorted lists containing n elements each .
　　a. 2n b.2n-1 c.2n+1 d.2n-2
　　7. Time complexity of n algorithm T(n), where n is the input size ,is T(n)=T(n-1)+1/n if n>1 otherwise 1 the order of this algorithm is .
　　a. log (n) b. n c. n^2 d. n^n
　　8. The number of 1’s in the binary representation of 3*4096+ 15*256+5*16+3 are .
　　a. 8 b. 9 c. 10 d. 12

扬智�Q�科技�Q�笔试题�?/SPAN>
　　1. Queue is a useful structure
　　* What is a queue?
　　* Write 5 operations or functions, without details, that can be done on a queue.
　　2. Insert a sequence fo keys(24,49,13,20,59,23,90,35) into a data structure, which has no keys initially. Depict the data structure after these insertions, if it is:
　　* a heap tree
　　* an AVL tree
　　3. * What is a synchronous I/O bus?
　　* What is an asnchronous I/O bus?
　　* Compare the advantages and disadvantages of synchronous and a synchronous I/O bus.
　　4. Explain the following terminology:
　　* Baud rate
　　* Handshaking
　　* Memory mapped I/O
　　5. Explain the key issues in supporting a real-time operation system for embedded system.
　　6. Explain the mapping of visual addresses to real addresses under paging by
　　* direct mapping
　　* associative mapping
　　* combined direct/associated mapping
　　7. Please explain what is “write-back�?and “write-through�? and discuss the advantage and disadvantage about these two methods.
　　8. Explain the concept and benefit of threads
　　9. What is hardware interrupt? What is software interrupt? What is exception? Please tell me all you know about interrupt.
　　10. Write a recursive function that tests wether a string is a palindrome. A palindrome is s string such as “abcba�?or “otto�?that reads the same in both directions.If you can write this function recursively,you can write an iterative version of this function instead.
　　11�Q�什么是�q�程�Q�Process�Q�和�U�程�Q�Thread�Q�？有何区别�Q?BR>　　12�Q�MFC和SDK有何区别�Q?BR>　　13�Q�IRP是什么？有何作用�Q?BR>　　14�Q�Windows 2000操作�pȝ��下用��h��式和内核模式下编�E�有何区别？
　　15�Q�驱动程序的BUFFER能swap到磁盘上��d��Q��ؓ什么？
　　16�Q�试�~�写3个函数实�?BR>　　�Q?�Q�徏立一个双向链�?BR>　　�Q?�Q�插入一个节�?BR>　　�Q?�Q�删除一个节�?BR>　　17�Q�简�q�Hardware interrupt和software中断的区别，��q�其应用�?BR>　　18�Q�试�~�写一个函敎ͼ�计算一个字�W�串中A的个数�?BR>　　19�Q�画出其相应��程囑�ƈ�~�写一个函数实��C��个整数到二进制数的�{换，如输�?�Q�输�?10�?BR>　　20�Q?BR>　　�Q?�Q�编写一个递归函数�Q�删除一个目录�?BR>　　�Q?�Q�编写一个非递归函数�Q�删除一个目录�?BR>　　�q�比较其性能�?/FONT>

�q�东北电面试题目
　　英文�W�试�?BR>　　1. Tranlation (Mandatory)
　　CDMA venders have worked hard to give CDMA roaming capabilities via the development of RUIM-essentially, a SIM card for CDMA handsets currently being deployed in China for new CDMA operator China Unicom. Korean cellco KTF demonstrated earlier this year the ability to roam between GSM and CDMA using such cards.However,only the card containing the user’s service data can roam-not the CDMA handset or the user’s number (except via call forwarding).
　　2. Programming (Mandatory)
　　Linked list
　　a. Implement a linked list for integers,which supports the insertafter (insert a node after a specified node) and removeafter (remove the node after a specified node) methods;
　　b. Implement a method to sort the linked list to descending order.
　　3. Debugging (Mandatory)
　　a. For each of the following recursive methods,enter Y in the answer box if themethod terminaters (assume i=5), Otherwise enter N.
　　static int f(int i){
　　 return f(i-1)*f(i-1);
　　 }
　　Ansewr:
　　static int f(int i){
　　 if(i==0){return 1;}
　　 else {return f(i-1)*f(i-1);}
　　 }
　　Ansewr:
　　static int f(int i){
　　 if(i==0){return 1;}
　　 else {return f(i-1)*f(i-2);}
　　 }
　　Ansewr:
　　b. There are two errors in the following JAVA program:
　　static void g(int i){
　　 if(i==1){return;}
　　 if(i%2==0){g(i/2);return;}
　　 else {g(3*i);return;}
　　 }
　　please correct them to make sure we can get the printed-out result as below:
　　3 10 5 16 8 4 2 1
　　
　　中文�W�试�?BR>　　1�Q�汉译英
　　北电�|�络的开发者计划��来自于不同组�l�的开发者，能够在北�늽��l�的�q�_��上开发圆满的补充业务。北�늽��l�符合工业标准的开放接口，��充业务的开展引入了无数商机�Q�开发者计划�ؓ不同层面的开发者提供不同等�U�的资格�Q�资格的划分�q�考虑��C��下因素：补充业务与北�늽��l��^台的集合�E�度�Q�开发者团体与北电�|�络的合作关�p�，�{�等�?BR>　　2�Q�编�E?BR>　　��整数�{换成字符�Ԍ��void itoa(int,char);
　　例如itoa(-123,s[])则s=�?123�?

��虫 2006-01-20 10:23 发表评论

技术之外的文字

��虫 — Wed, 18 Jan 2006 09:14:00 GMT

刚在china-pub里翻了翻书目�Q�由于最�q�在��?Bruce Eckel 的C++�~�程思想�Q�顺便去瞅了瞅其中文版的书评�?BR> 象大多数��译版的作品一��P��C++�~�程思想的翻译版被许多读者（留了�a�的读者）损的一塌糊涂。其实�Q何事情都是说��h��Ҏ��Q�做��h��难，当一份真正经典的计算��Z��c�摆在眼前时�Q�其�l�典之处除了对于技术的透彻讲述、细致的选材之外�Q�往往也颇具阅读趣呟뀂想要翻译好一部这��L��书籍�Q��ƈ非易事。除了深厚的技术功底、对技术的透彻了解之外�Q�也需要扎实的语言功底�Q�既能理解作者的意图�Q�也要能够用语言��其完美的诠释�?BR> 我有几个熟识的朋友，都�ƈ非计��机专业�Q�他们大都对计算��Z��业能够有�q�么多经典著作（无论原版�q�是��译版本�Q�出现在国内的市��Z��表示��慕不已。虽然现在有些出版物的确有不负责��M��嫌，但真正热��p��门科学的朋友�Q�我�怿�一定能够克服语�a�斚w��的障��，通过交流和不断的学习�Q�领悟到技术的�_�N��?BR>
�E�有感悟�Q�特此一讎ͼ� (若有不同意见�Q�欢�q�拍�?

��虫 2006-01-18 17:14 发表评论

��虫 — Mon, 16 Jan 2006 07:53:00 GMT

    在��用类之前�Q�我们通常会在�E�序中包含某个相应的头文�Ӟ��因�ؓ自定义的�c�dƈ不是�E�序语言本��n的内建（built-in�Q�。例如：
     #include
     string s1[3] = {"winne","jackie","xp"};

    一般类的定义方式�ؓ�Q?br>      class stack //stack为类�?br>      {
       public:
           //.... 公共接口
       private:
          //....�U�有量的实现
     }

    成员函数可以在类��M��内定义，也可以在��M��外定义，但必��d��class��M��内进行声明。在��M��内定一的成员函��C��被自动视为内联（inline�Q�函敎ͼ�在主体外定义成员函数�Q�如果希望该函数为inline�Q�必��L��式声明。例�Q?br>      inline bool
     stack::empty()
     {
         return _stack.empty();
     }
    �q�算�W�（::�Q�是class scope resolution�q�算�W?br>
    通常�cȝ��定义和内联成员函��C��攑֜�与类同名的头文�g中。如上例中的stack class的定义和empty()函数的定义，都放在stack.h文�g中�?/font>

��虫 2006-01-16 15:53 发表评论