要不是因為哥哥在網上搜到這個博客,我近乎(已經)忘記了它的存在,當哥哥把貌似熟悉的文字發給我看時,驚喜和溫柔,不能完全描述我的當時的心情。即使是現在,仍然能感受到這種歡欣和被愛的快樂。
這個新年,在哥哥每日早上的問候,和馬普爾小姐的鄉村生活中,淡淡的度過。和哥哥在一起的日子,完全可以不需要網絡的存在,只和對方相伴,都能有著無比精彩和豐富的生活。
網絡聊天的工具,就讓它慢慢淡出我的生活吧,也未嘗不是一個新的開始。
最近在看Java版的數據結構和一些Android的知識,在這里,重新開辟一個小天地吧。For both of us, only love that matters……
posted @
2011-02-09 17:06 小蟲 閱讀(174) |
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1. C++的函數可以放在strcut內部作為“成員函數”。
2. C++編譯器將結構名轉變為一個新的類型名(如int,char,float和double是類型名一樣)
3. 在下面的C版本的struct的函數中,硬性傳遞結構的地址作為這些函數的第一個參數。例如:
typedef struct CstashTag{
int size; //size of each space
//.........
} Cstash;
void initialize(CStash *s, int size);
而C++中則不是,這一過程是由編譯器來完成。
struct Stash {
int size; //size of each space
//.........
void initialize(int size);
};
posted @
2006-01-20 11:57 小蟲 閱讀(1672) |
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華為筆試題
1.請你分別畫出OSI的七層網絡結構圖和TCP/IP的五層結構圖。
2.請你詳細地解釋一下IP協議的定義,在哪個層上面?主要有什么作用?TCP與UDP呢?
3.請問交換機和路由器各自的實現原理是什么?分別在哪個層次上面實現的?
4.請問C++的類和C里面的struct有什么區別?
5.請講一講析構函數和虛函數的用法和作用。
6.全局變量和局部變量有什么區別?是怎么實現的?操作系統和編譯器是怎么知道的?
7.8086是多少位的系統?在數據總線上是怎么實現的?
聯想筆試題
1.設計函數 int atoi(char *s)。
2.int i=(j=4,k=8,l=16,m=32); printf(“%d”, i); 輸出是多少?
3.解釋局部變量、全局變量和靜態變量的含義。
4.解釋堆和棧的區別。
5.論述含參數的宏與函數的優缺點
普天C++筆試題
1.實現雙向鏈表刪除一個節點P,在節點P后插入一個節點,寫出這兩個函數。
2.寫一個函數,將其中的\t都轉換成4個空格。
3.Windows程序的入口是哪里?寫出Windows消息機制的流程。
4.如何定義和實現一個類的成員函數為回調函數?
5.C++里面是不是所有的動作都是main()引起的?如果不是,請舉例。
6.C++里面如何聲明const void f(void)函數為C程序中的庫函數?
7.下列哪兩個是等同的
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.內聯函數在編譯時是否做參數類型檢查?
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:
?。?)What does the keyword volatile mean? Give an example
(2)Can a parameter be both const and volatile? Give an example
?。?)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?
?。?)const int a;
?。?)int const a;
?。?)const int *a;
?。?)int * const a;
?。?)int const * a const;
5. Which of the following statements describe the use of the keyword static?
?。?)Within the body of a function: A static variable maintains its value between function revocations
(2)Within a module: A static variable is accessible by all functions within that module
?。?)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;
}
維爾VERITAS軟件筆試題
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
揚智(科技)筆試題目
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.
11.什么是進程(Process)和線程(Thread)?有何區別?
12.MFC和SDK有何區別?
13.IRP是什么?有何作用?
14.Windows 2000操作系統下用戶模式和內核模式下編程有何區別?
15.驅動程序的BUFFER能swap到磁盤上去嗎?為什么?
16.試編寫3個函數實現
?。?)建立一個雙向鏈表
?。?)插入一個節點
?。?)刪除一個節點
17.簡述Hardware interrupt和software中斷的區別,簡述其應用。
18.試編寫一個函數,計算一個字符串中A的個數。
19.畫出其相應流程圖并編寫一個函數實現一個整數到二進制數的轉換,如輸入6,輸出110。
20.
?。?)編寫一個遞歸函數,刪除一個目錄。
?。?)編寫一個非遞歸函數,刪除一個目錄。
并比較其性能。
廣東北電面試題目
英文筆試題
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
中文筆試題
1.漢譯英
北電網絡的開發者計劃使來自于不同組織的開發者,能夠在北電網絡的平臺上開發圓滿的補充業務。北電網絡符合工業標準的開放接口,為補充業務的開展引入了無數商機,開發者計劃為不同層面的開發者提供不同等級的資格,資格的劃分還考慮到以下因素:補充業務與北電網絡平臺的集合程度,開發者團體與北電網絡的合作關系,等等。
2.編程
將整數轉換成字符串:void itoa(int,char);
例如itoa(-123,s[])則s=“-123”;
posted @
2006-01-20 10:23 小蟲 閱讀(2699) |
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剛在china-pub里翻了翻書目,由于最近在翻 Bruce Eckel 的C++編程思想,順便去瞅了瞅其中文版的書評。
象大多數翻譯版的作品一樣,C++編程思想的翻譯版被許多讀者(留了言的讀者)損的一塌糊涂。其實任何事情都是說起來容易,做起來難,當一份真正經典的計算機書籍擺在眼前時,其經典之處除了對于技術的透徹講述、細致的選材之外,往往也頗具閱讀趣味。想要翻譯好一部這樣的書籍,并非易事。除了深厚的技術功底、對技術的透徹了解之外,也需要扎實的語言功底,既能理解作者的意圖,也要能夠用語言將其完美的詮釋。
我有幾個熟識的朋友,都并非計算機專業,他們大都對計算機專業能夠有這么多經典著作(無論原版還是翻譯版本)出現在國內的市場上表示羨慕不已。雖然現在有些出版物的確有不負責任之嫌,但真正熱愛這門科學的朋友,我相信一定能夠克服語言方面的障礙,通過交流和不斷的學習,領悟到技術的精髓。
稍有感悟,特此一記! (若有不同意見,歡迎拍磚)
posted @
2006-01-18 17:14 小蟲 閱讀(262) |
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在使用類之前,我們通常會在程序中包含某個相應的頭文件,因為自定義的類并不是程序語言本身的內建(built-in)。例如:
#include <string>
string s1[3] = {"winne","jackie","xp"};
一般類的定義方式為:
class stack //stack為類名
{
public:
//.... 公共接口
private:
//....私有量的實現
}
成員函數可以在類主體內定義,也可以在主體外定義,但必須在class主體內進行聲明。在主體內定一的成員函數會被自動視為內聯(inline)函數;在主體外定義成員函數,如果希望該函數為inline,必須顯式聲明。例:
inline bool
stack::empty()
{
return _stack.empty();
}
運算符(::)是class scope resolution運算符
通常類的定義和內聯成員函數會放在與類同名的頭文件中。如上例中的stack class的定義和empty()函數的定義,都放在stack.h文件中。
posted @
2006-01-16 15:53 小蟲 閱讀(508) |
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