C++

String Conversion Functions1) atof converts a string into a floating-point numberCorrelation function Atoi,atol,strtod,strtol,strtoulTable header file #include Defines the function double atof (const char *nptr);The function Description Atof ()

Directory operation function 1) closedir close directoryCorrelation function: OpendirTable header files: #include #include define function: int closedir (DIR *dir);Function Description: Closedir () closes the directory stream that the parameter dir

Reprint Please specify source: http://blog.csdn.net/suool/article/details/38129201Problem IntroductionTypes of filesDepending on how the data is stored, you can divide the file into text files and binary files. Detailed differences and relationships

This is the way the blogger uses recursion to write a simple business with C, forgetting to write return due to carelessness. The result is that the returned results are still correct. After half an hour of disassembly, I proved my guess and now

Valgrind is a memory debugging tool for Linux (x86, x86_64, and PPC32) programs that can monitor memory usage of the compiled binaries (malloc and free in C, and new and delete in the C + +). Identify memory leak issues.The Memcheck tool included in

For a class, we refer to copy constructor, copy-assignment operator, move constructor, move-assignment operator, destructor collectively as copy ControlToday we first talk about the copy constructor, copy-assignment operator destructor these

9th Chapter Sequential Container9.1 Sequential Container Overview Basic principles for selecting containers: Vectors should be used unless there are good reasons to choose other containers; If the program has many small

fopen () is a common function used to open a file in a specified manner, with the following prototype:FILE * fopen (const char * path, const char * mode);"Parameter" path is the file name that contains the path, mode is the file open mode.Mode is

BodyThe C++11 standard provides components for multithreading in the standard library, which means that it is possible to write platform-independent multithreaded programs using C + +, and the portability of C + + applications is strongly guaranteed.

Previously, the mail slots have been used for interprocess communication: http://www.cnblogs.com/jzincnblogs/p/5192654.html, which uses named pipes for interprocess communication.Unlike postal slots, named pipes transfer data between processes in a

First release, but also in the revision of the perfect.In a program run, the amount whose value cannot be changed becomes a constant. In the basic data type, constants can be divided into integer constants, real constants, symbolic constants, and

Ladies and gentlemen, crossing, the last time we were talking about the example of a DIY pwd command, this time we said the example is:DIY cd command . Gossip Hugh, words return to the positive. Let's talk C chestnuts together!Crossing, in the Linux

A program mainly includes the following two aspects of information: 1) Description of the data. In the program to specify which data to use and the type of data and the organization of the data, this is the data structure (data structure). 2)

Pointer is a pointer, pointer variable in the system, will always account for 4 byte , its value is the address of a certain memory. The pointer can point to anywhere, but not anywhere you can access it through this pointer variable. an array is

Date conversion OneIn order to achieve different display effects sometimes we need to convert the time, the default format is: 2007-01-03 14:33:34, to convert to another format, to use the DateTime.ToString method (String, IFormatProvider), As shown

method Two : use MSBuild SidekickMSBuild Sidekick is a third-party tool suite for VSThe TFS account that uses this tool must have certain permissions, and the following is a brief description of how to use it.First to

3.4.2 Assignment operatorTable 3-9 lists these operators and their descriptions.As you can see, these operators also include VAR1 in the calculation process, the following code:Var1 + = var2;The result is the same as the following code.var1 = var1 +

C ++ standard library and reserved words (keywords) -- Appendix: C ++ standard documentation, keyword documentationIntroduction Up to now, C ++ has released four international standards: ISO/IEC 14882: 1998, ISO/IEC 14882: 2003, ISO/IEC 14882: 2011,

C ++ Primer notes (2): namespace, primer namespace Large programs are generally divided into multiple modules, which are developed by collaboration among multiple people, and libraries are inevitably used. The Code of each module and the library

Set the foreground color background color in POI Excel Set the background color in POI as follows: HSSFCellStyle cellStyle = wb. createCellStyle (); cellStyle. setFillBackgroundColor (HSSFColor. TEAL. index); // set the background color cellStyle.