sas macro programming

OracleThe decode function in the database is one of the common functions of Oracle PL/SQL. What is its purpose? Next we will introduce this process and how to use it.SAS macroTo implement the decode function in the Oracle database. First, let's construct an example. If we want to add a salary to a staff member of zhixing, the standard is: the salary is less than 8000 RMB plus 20%; the salary is more than 8000 RMB plus 15%, usually, select the salary field value in the record first? Select salary

C ++ macro programming and macro Programming1. Define a macro function so that func (x) = X-1? In the simplest way, if x = 2, # define func (x) 1 is specially converted to x, so that # define func_helper_2 1 # define func (x) func_helper _ # x is created when x = 2. to promote to other numbers, you only need to define:

Continue with the previous Reading Notes, talk nonsense, and go straight to the topic. This article focuses on the infile statement. 11: infile statement DSDIt is required that a dataset can contain delimiters, but must be enclosed in quotation marks. The number between two consecutive delimiters is treated as missing values,The default Delimiter is comma. Firstobs =Read from this record row Obs =Number of records to be read Length = virableAssign the Data Length of the current row to the Tempor

usually defined as an integer value. And as the standard changes, the __cplusplus macro will generally be a larger value than the previous table.For example, in the C++03 standard, the value of __cplusplus is predetermined to 199711L, and in C++11 Standard, the macro __cplusplus is predefined as 201103L. This change can be used for the code.For example, when a programmer wants to make sure that the code is

intention is5 intproduct=x* (y+3)6 intmax= (x>y?x:y) +27 //The actual macro expansion becomes8 intproduct=x*y+39 intmax=x>y?x:y+2The solution includes the following two points:(1) Add parentheses to the parameter itself(2) Add parentheses to the entire macro definitionThe result of the modification is as follows:#define MAX (a) (a) > (b)? ( A):(B))#define MUL (a) (a) ((a) * (b))2.3 Common sense issues with

On the basis of language, release-1.1, the individual feels that the language is far from the ideal country of his heart. This language because the audience is not only the programmer has a lot of confusing design, but it is strange that its syntax and other imagery design, although it is not intended for programmers, the intrinsic is provided a large number of non-programmers are not available advanced features, libraries. With enthusiasm still, I pick some interesting things to write again.Met

Use the Linux kernel linked list, hlist macro definition, and operations in user space programming. List_head and hlist_head/hlist_node in Linux kernel are two important linked list construction tools that concatenate data structures into linked lists. Using their corresponding macro definition, you can easily construct data into a linked list for various operat

Enumerations are the basic data types that programmers define themselves, and variables of this type can only take the values in the enumeration, and the benefit is the ability to prevent the erroneous assignment of variables. Usage: Enum type name {variable 1, variable 2, variable 3, ...}C language macro definition is defined in the program head, for preprocessing, there are no parameters and two, can be regarded as a process of invocation, and funct

'. This will not misinterpret this particular variable as a cookie, session, or GET variable. The second setting to check is the error reporting level. During development, you want to get as many error reports as possible, but when you deliver the project, you want to log the error to the journal file instead of on the screen. Why? Because malicious hackers use error reporting information, such as SQL errors, to guess what the application is doing. This reconnaissance can help hackers break thr

6.1 Global Variables6.2 Compilation preprocessing6.3 Large Program Structure6.1 Global VariablesGlobal variablesVariables defined outside the function are global variablesGlobal variables have global lifetimes and scopesThey have nothing to do with any function.They can be used inside any functionGlobal variable InitializationA global variable that does not initialize will get a value of 0The pointer will get a null valueGlobal variables can only be initialized with values that are known at comp