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Javascript I. Features1. Case-sensitive2. Weakly typed variable, only with the keyword "var"3. Note/*....*/Two. Variables1. The variable is declared by the keyword var.2.var can declare multiple variables at the same time. -------var girl= "jsaacom", Age=19,male=false;3. Variables are not necessarily initialized. ---------var people;Three. Variable name rules1. The initial letter must be (letter, underscore, or dollar symbol)2. The remaining letters can be underscores, dollar characters, any let

Data type1. String2. Numerical type3. Boolean type4. Objects5. Arrays In order to be more standard, make oneself in the future work more easy and convenient maintenance, adopt some data type of name life habit Type Prefix Example Array A Aarray Boolean value B Bmale Floating point F FTax Function Fn Fnswap Integral type I

. ConfigurationSettings. deleettings ["downloadurl"]. ToString () + DateTime. Today. ToString ("yyyyMMdd") + new Random (DateTime. Now. Millisecond). Next (10000). ToString () + ". csv"; // store it in the path specified by downloadurl in web. config. The file format is the current date + 4 bits Number of machinesFileStream fs = new FileStream (name, FileMode. Create, FileAccess. Write );StreamWriter sw = new StreamWriter (fs, System. Text. Encoding. GetEncoding ("gb2312 "));Sw. WriteLine ("auto

cstudent; }//_implement_runtimeclass (Cstudent, CObject, 1, cstudent::createobject) afx_datadef CRuntimeClass CStudent:: Classcstudent = {"Cstudent", sizeof (class cstudent), 1, Cstudent::createobject, Runtime_class (CObject), NULL}; cruntimeclass* Cstudent::getruntimeclass () const {return runtime_class (cstudent);} Afx_classinit _init_cstudent (Runtime_class (cstudent)); carchive AFXAPI operator>> (carchive ar, cstudent* pob) {pOb = (cstudent*) ar. ReaDobject (Runtime_class (cstudent)); retur

machine environment, my 32-bit Linux is 4 length $format = ' A10name/a33pass/iage/cflag '; Determines how many length bytes a struct occupies, and it is not necessary to read only a single structure $length = 10 + 33 + 4 + 1; can also use fopen + Fread + fclose, but file_get_contents because it can be mmap, more efficient $data = file_get_contents (' file.dat ', ' R '); for ($i = 0, $c = strlen ($data); $i $bianbian = Unpack ("$format", $data);