fips definition

Macro definition is a precompiled function, precompilation is also known as preprocessing, is the preparatory work for the compilation of the stage. Handle the instructions at the beginning of the #, such as copy #include contained file code, #define宏定义的替换, conditional compilation, etc.Benefits of using macro definitions: The benefits of using macro definitions can improve the versatility and readability of programs, reduce inconsistencies, reduce inp

[Switch] DEFINE introduction and multi-row macro definition in C language, define multiple lines [Go] DEFINE introduction and multi-row macro definition in C LanguageTo write a good C language, a beautiful macro definition is very important. Macro definition can help us prevent errors and improve code portability and r

1. Rules and usage resolution for macro definitions(1) The parsing rule of a macro definition is that it is replaced by a preprocessor during the preprocessing phase, and the substitution is unchanged.(2) The macro definition substitution is performed recursively until the replaced value itself is no longer a macro.(3) A correct macro definition of the formula it

Differences between variable definition and Declaration (Reprinted) In program design, we always use the definition of variables and the declaration of variables. Sometimes we are not very clear about this concept and know how to use it, but I don't know how it will take for a while. Below I will simply introduce their differences as follows: There are two scenarios for variable declaration:(1) One is to cr

Macro Definition Learning (1) Macro names are generally capitalized(2) The use of macros can improve the universality and readability of the program, reduce inconsistencies, reduce input errors and facilitate modification. Example: array size common macro definitions(3) Preprocessing is the processing before compiling, and one of the tasks of compiling is grammar checking, preprocessing does not do grammar checking.(4) No semicolon at the end of

A macro definition is one of the pre-compilation features, pre-compilation, also known as preprocessing, is the preparatory work for the compilation phase. The instructions that handle the beginning of the #, such as the file code that the copy #include contains, #define宏定义的替换, conditional compilation, and so on.Benefits of using macro definitions: Benefits of using Macro definitions: Improves program versatility and readability, reduces inconsistenci

6.3 first recognized class Class introduces some new syntax: three new object types and some new semantics.6.3.1 class definition syntax The simplest form of class definition is as follows: Class ClassName: . . . The class definition is the same as the function definition (def statement). It must be executed befo

1. Reference: refer to a resource ID. 1) attribute definition: 2) attribute usage: Android: layout_width = "42dip" Android: layout_height = "42dip" Android: Background = "@ drawable/image ID"/> 2. Color: color value. (1) attribute definition: (2) attribute usage: Android: layout_width = "42dip" Android: layout_height = "42dip" Android: textcolor = "#00ff00"/> 3. boolean: Boolean value. (1) a

/Home/TACE/openav/source/seamlessmessage/cpaoflt. O: In function 'cpaoflt: get_m_strprmair () const ':Cpaoflt. cpp :(. Text + 0x0): Multiple definition of 'cpaoflt: get_m_strprmair () const'/Home/TACE/openav/source/seamlessmessage/cpaoflt. O: cpaoflt. cpp :(. Text + 0x0): first defined here During the compilation process, GCC reports the multiple definition of function errors, mainly including the followin

There are two types of macro definitions: macro definitions without parameters and macro definitions with parameters. Macro definition without ParametersThe general format of macro definition without parameters is: # Define macro name string# Define PI 3.1415926Main (){Float area, R;Printf ("Area = % F", pI * r * R );}In the above program, the macro pi is used to replace the string 3.1415926. The advantage

Ask questions:If you have such a template:class test{public: static std::string info;};What is right (by compiling) for several of the following definitions?Template stringtestint>::info ("123"); templatestringTest"123"); templatestringTest:: Info;templatestringtestint>:: info; templatestringtestint>:: info (); templatestringTestIn order not to affect the analysis and judgment, I put the answer color into a relatively light color, the following is the answer: Template Template

We are in the program design, always use the definition of variables and variable declarations, but sometimes we are not very clear about the concept, know how it is used, but do not know how to do, the following I simply put their differences are described as follows: There are two things about the declaration of a variable:(1) One is the need to establish storage space (definition, declaration). For exam

To write a good C language, a beautiful macro definition is very important. Macro definitions can help us prevent errors, improve code portability and readability, and more.In the software development process, there are often common or common functions or code snippets that can be written as functions or encapsulated as macro definitions. So is the function good or the macro definition good? This requires u

You can use either of the following methods to view definition statements of objects such as tables, stored procedures, and triggers: 1. query the all_source table 2. Use the DBMS_METADATA Package 1. Use all_sourceTable First, let's check which types of objects can be viewed through the all_source table: SQL> select distinct type from all_source; Type ------------ Type Body Procedure Type Function Trigger Package body Package View the Stored Procedure

BOS Project Note 11th DayContent:1. Provide a new JSON file, modify the System menu (join the Workflow menu)2. Process definition Management (query, deployment process, view PNG process picture)3. Process instance Management (query, view running status)4. Synchronize user data and role data in the BOS system to Activiti user and group tables1. Provide a new JSON file, modify the System menu (join the Workflow menu)2. Process

Macro definition ' DefineRepresents a string with a specified identifier (that is, the name), which is in its general form:' Define identifier (macro name) string (macro content)such as: ' Define signal stringIts function is to specify the identifier signal instead of string, in the process of compiling preprocessing, all the signal after the command is replaced by string. This method allows the user to replace a long string with a simple name, or a m

In objective-C, how do I define a class? We can use the following format for representation: @ Interface Class Name: parent class name {variable definition;} method definition; @ end; An example is provided below: @ Interface person: nsobject {nsstring * Name; int age;}-(nsstring *) Name;-(INT) age;-(void) setname: (nsstring *) input; -(void) setage: (INT) input; @ end; The class

Reading Notes Objective c ++ Item 26: postpone variable definition as much as possible.1. defining variables will cause constructor and destructor overhead Whenever you define a type of variable: when the control flow reaches the definition point of the variable, you introduce the overhead of calling the constructor. After leaving the scope of the variable, you introduced the overhead for calling the destru

Most of the definition of CSS based on the requirements of the project customization, not suitable for each site, put forward a way of thinking. Mainly compatible with Moz IE6. For many years without ie5.x, and also did not test the environment, work and their own projects have not considered IE5; The definition name mainly uses the single letter recognition. The main is to use their own, red

The amount of space occupied by each object in C + + is determined at compile time, and before the template class is actually used, the compiler is unable to know the size of the space occupied by the object using the template type in the template class. Only when the template is actually used does the compiler know what type of template to apply and how much space should be allocated. This is why the template class is simply called a template, not a generic type.Since it is compiled at compile