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RSS订阅原创 Learing_log Hints on Selecting Which Container to Use
<br />There are a few rules of thumb that apply to selecting which container to use:<br /> <br />1. If the program requires random access to elements, use a vector or a deque.<br /> <br />2. If the program needs to insert or delete elements in the middle o
2010-08-21 14:18:00
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原创 Learning_log—pointer
There are only four kinds of values that may be used to initialize or assign to a pointer:A constant expression with value 0An address of an object of an appropriate typeThe address one past the end of another object.Another valid pointer of the same type
2010-08-09 16:31:00
543
原创 Learning_log—vector
<br />Subscripting Does Not Add Elements<br /> <br />Programming new to C++ sometimes think that subscripting a vectors adds elements;it does not:<br /> <br />vector<int> ivec; //empty vector<br /> for (vector<int>::size_type ix = 0; ix != 10; ++
2010-08-03 15:58:00
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原创 Learning_log—string
Read and dicard any leading whitespace(e.g., spaces, newline, tabs)It then reads characters until the next whitespace character is encountered
2010-08-03 05:23:00
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原创 Learning_log—const
When a const is initialized by a value that is not a const expression, then it should not be defined in header file.Insted, as with any other variable, the const should be defined and initalized in a source file. And extern declaraion for that const shoul
2010-08-02 18:40:00
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原创 Learning_log—struct and class
<br />The only difference between a class defined with the class keyword or the struct keyword is the default access level:<br /> <br />By default ,member in a struct are public; those in a class are private.
2010-08-02 17:38:00
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原创 Learning_log—Enumeration
Defining and Initializing Enumerationenum opern_modes {input, output, append};By default, the first enumerator is assigned the value is zero.Each subsequent enumerator is assigned a value one greater than the value of the enumerator that immediately preced
2010-08-02 16:12:00
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原创 学习日志—const reference
A nonconst reference may be attached only to an object of the same type as the reference itself.A const reference may be bound to an object of a different but related type or to an rvalues.For example:double dval = 3.14;const int &ri = dval;//the com
2010-08-02 15:44:00
510
原创 学习日志—lvalue/rvalue
<br />左值（lvalue)就是变量的地址，或者是一个代表“对象在内存中的位置”的表达式。<br /> <br />右值（rvalue）就是变量的值。<br /> <br />变量名出现在赋值运算符左边，就是一个左值；而出现在赋值运算符右边的变量名或字面常量就是一个右值。<br /> <br />vala = valb / 8;
2010-08-02 12:46:00
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原创 学习日志—类型和声明—advice
<br />[1]Keep scopes small.<br /> <br />[2]Don't use the same name in both a scope and an enclosing scope.<br /> <br />[3]Declare one name (only) per declaration.<br /> <br />[4]Keep common and local names short, and uncommon and nolocal names longer;<br
2010-07-31 19:50:00
454
原创 学习日志—类型和声明—float
<br />The floating-point types come in three size:float,double and long double.<br /> <br />By default ,a floting-point literal is of type double .<br /> <br />If you want a floating-point literal of type float ,you can define one using the suffix f or F.
2010-07-29 14:20:00
515
原创 Integer Type
Three forms:int ,signed int ,unsigned intThree sizes:short int(short), int , long int ( long )
2010-07-29 13:52:00
519
原创 学习日志—类型和声明—char
signed char which can hold at least the values -127 to 127unsigned char which can hold at least the values 0 to 255wchar_t enough to hold the largest character set (unicode),wchar_t is a typedef
2010-07-29 13:28:00
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原创 学习日志—类型和声明
<br />虽然知道了一些类型，但是也忽略了一些类型：<br /> <br />C++ Fundamental Type:<br /> <br />a user can difne:<br /> <br />Enumeration type for representing specific sets of values(enum)<br /> <br />A type,void , used to signify the absence of information<br /> <br />Pointer
2010-07-29 12:32:00
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原创 学习日志—来自他的忠告
<br />[1]Don't reinvent the wheel;use libraries.<br /><br />[2]Don't believe in magic;understand your libraries do,how they do it,and what cost they do it .<br /><br />[3]When you have a choice ,prefer the standard library to other libraries.<br /><br />[4
2010-07-29 10:19:00
546
翻译 学习日志—container
<br />A map, a list , and a vector can each be used to represent a things.<br /> <br />However,each has strengths and weaknesses.<br /> <br />For example：<br />subscripting a vector is cheap and easy.<br /> <br />On the other hand, inserting an element bet
2010-07-28 17:11:00
446
原创 学习日志—advice
<br />[1]Don't panic!All will become clear in time;<br />[2]Yon don't have to know every detail of C++ to write good programs;<br />[3]Focus on programming techniques ,not on language feature;<br /> <br /> <br /> <br /> <br />
2010-07-28 14:03:00
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原创 学习日志—HTML
<br />关于meta的使用。<br /> <br />要选择与网站或页面主题相关的文字作关键字。<br /> <br />选择具体的语句，别寄希望于行业或笼统的语句。<br /> <br />揣摩用户会用什么作为搜索词，把这些词放在页面上或直接作为关键字;<br /> <br />关键字可以不只一个，最好根据不同的页面，制定不同的关键字组合，这样页面被搜索到的概率将大大增加。<br /> <br /><html><head><meta name="keywords" content="插
2010-07-27 23:39:00
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转载 学习日志—忠告
Here is a set of "rules"you might consider while learning c++ . As you get more proficient you can evolve them into something suitable for your kind of applications and your style of programming.They are deliberately very simple,so they lack detail.Don't t
2010-07-27 18:00:00
396
转载 学习日志—给C程序员的建议
为了帮助自己区分之前学习C语言：[1]在C++里几乎不需要用宏。consat或enum定义明显的常量，用inline避免函数调用的额外开销，用template去刻画 families of functions of types, and namespace to avoid name clashes.[2]不要在你需要变量之前去声明它，以保证你能立即对它进行初始化。A declaration can occur anywhere a statement can ,in for-statement ini
2010-07-27 17:19:00
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原创 学习日志—序
<br /> 看了Bjarne Stroustrup的序章，让我感触颇深的是，C/C++形式的宏是一种严重的缺陷。<br /> <br />另外强制转换的大量使用都是设计不良的标志。<br />
2010-07-27 14:39:00
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原创 学习日志—API
WINDOWS程序的控制流程1/程序接入点int APIENTRY WinMain( HINSTANCE hInstance , HINSTANCE hPrevInstance , LPSTR lpCmdLine , int nCmdShow )2/注册窗口类WNDCLASS wndclass;wndclass.style = CS_HREDRAW | CS_VREDRAW ;wndclsss.lpfnWndProc = WndProc;RegisterClass ( &wndclass );3/建立窗口H
2010-07-27 00:46:00
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原创 学习日志—异常处理机制
今天学习了异常处理机制，感觉很强大，但是还是不会用= =，try-throw-catch只知道这三个基本功能，另外配合上多态性，能构成异常检查的体系结构。初步了解C++是我这1个月的首要目的。然后再逐渐深入学习，虽然有些人在鄙视C++，但我依然坚持着自己的想法。我对别人的意思仅做参考。我之前学过VB,和C，虽然基本都是睡过来的。但是一些语法和算法还是有点印象。学C++最吸引我的地方它是一个试图描述世界的语言，当然也是因为这个导致C++很难，对我来说的确很难，可能我是个超集大菜鸟吧。
2010-07-24 04:24:00
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ACM常用代码ACM常用代码ACM常用代码
2010-07-26
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