define mmi

Constants are the amount that cannot be changed in a program, there are two ways to define constants in C + +, one is to use the Define macro definition, and one is the new const type constant variable in C + +, the following mainly discusses the related problems between them;Constants defined by define:Define is a preprocessing directive that defines a macro, which is simply a substitution that replaces th

ObjectiveIn the process-oriented language, such as C, #define is very common, and indeed useful, it is worth advocating. But in today's object-oriented languages, such as the C + + language, #define should be used sparingly.Why is it less used in C + +?This is because #define mechanism is simply a substitution of characters, so that you cannot add some C + + synt

Mini-define A simple front-end modular framework based on require implementation. If you don't want to spend time learning require.js, and don't want to look at long CMD/AMD specifications, then this mini-define is a good choice for you. If you've used Sea.js or require.js before, then mini-define is more efficient, lighter, and easier to use. Project Address: G

1) #define是预处理指令, in the compilation preprocessing simple substitution, does not make the correctness check, does not have the meaning whether correctly still to carry in, only has in the compilation has been expanded the source program only then discovers the possible error and errors. Like what:#define PI 3.1415926In the program: Area=pi*r*r will be replaced with 3.1415926*r*rSuppose you write the number

1) #define是预处理指令, in the compilation preprocessing simple substitution, does not make the correctness check, does not have the meaning whether correctly still brings in, only when compiles the already expanded source program only then discovers the possible error and error. For example:#define PI 3.1415926In the program: Area=pi*r*r will be replaced with 3.1415926*r*rIf you write the number 9 in the #

Define is a pre-processing command in C language. It is used for macro definition, which can improve the readability of the source code and provide convenience for programming. Pre-processing commands start with "#", for example, include commands # include and macro-defined commands # define. Usually put in front of the source file, which is called preprocessing. Preprocessing refers to the work done before

1 :__ file __,__ line __, macro expanded, Middle Layer Macro _ File _ is the predefine macro of the compiler, indicating the absolute path of the file, but ASCII characters. Suppose you want to convert _ file _ into a wide character. Maybe you want # DEFINE _ wfile _ L ##__ file __ Wchar_t pszfilepath [] =__ wfile __; In this case, the compiler will prompt that "l1_file _" is an undeclared identifier. Why? If the parameter after # Is a macro, # will

(1) "/" And a macro with a long number of rowsThe macro definition can contain more than two lines of commands. In this case, you must add "/" on the rightmost side and the line "/". No more characters are allowed, and no comments are allowed, the following line must end with "/", "/" followed by a space, and an error will be reported, not to mention it.# Define Exchange (a, B ){/Int t ;/T = ;/A = B ;/B = T ;/} (2) '/' And a long condition judgment st

Define constant. According to the manual, only constants defined by define are allowed: scalar and null. The scalar type is integer, float, string, or boolean. You can also define the constant value type as resource. see the manual. the constants defined by define are only allowed: Only scalar and null are allowed.

Constant: Representing constants with macros If we want to write a program for various computation of circles, then the round (3.14159) value will be widely used. We obviously have no reason to change the value of limit, so we should treat it as a constant. So, do we have to write the 3.14159 long string over and over again? The macro is used. Macros can be used not only to replace constant values, but also to replace expressions or even code segments. Macro Syntax: #

1) # define is a pre-processing command. It is a simple replacement during compilation and pre-processing, and does not check the correctness. It does not mean that it is correct or not, possible errors are detected and reported only when the expanded source program is compiled. For example:# Define PI 3.1415926In the program: Area = pI * r will be replaced with 3.1415926 * r * RIf you write the number 9 in

it must have been seen by many people. #ifndef/#define/#endif in the header file prevents the header file from being repeatedly referenced. But what does it mean to understand "repeated references"? Is it possible to include this header file in a different two files using include? What happens if the header file is repeatedly referenced? Are all header files to be added to #ifndef/#define/#endif these codes