with define

The difference between #define, const, typedef#define is not defining variables, it's just for text substitution.For example:#define PI 3.1415926float Angel;angel=30*pi/180;Then, when the program is compiled, the compiler will first "#define PI 3.141

1. Define (that is, host variable)The main role of the host variable is to act as an alternative variable, a medium in which the host environment can interact with Oracle . When you define a host variable by define, you must specify the variable

#define是C语言中提供的宏定义命令, the main purpose is to provide programmers with certain convenience in programming, and to a certain extent, improve the efficiency of the program, but students often do not understand the nature of the command in learning,

Macro definition in many languages can see its shadow, C #, C++,c, and so on, especially the system API inside a lot of macro definition, looking very bluffing people. Reasonable use of macro definition, you can make your code look more standardized,

Definition: The # define Directive You can use the # define directive to give a meaningful name to a constant in your program. The two forms of the syntax are: Syntax # Define identifier token-stringopt # Define identifier [(identifieropt,...,

The first type: Object impersonationfunction ClassA (scolor) { this.color = Scolor; This.saycolor = function () { alert (this.color); };} function ClassB (Scolor, sName) { this.newmethod = ClassA; This.newmethod (Scolor);

Difference between typedef and define   The following code is used to describe Typedef char * typedef_char;# Define define_char char * // No semicolon here Void main (INT argc, char * argv []){Char s [] = "ASDF ";Const typedef_char P = s; // char *

1 NO parameter macro definitionThe macro name of the parameterless macro is not followed by a parameter.The general form of its definition is:#define Identifier stringWhere the "#" indicates that this is a preprocessing command. All that begin with "

There are many places in the C language where macro definitions are used, such as in header files to prevent header files from being repeatedly included: #ifndef ctest_header_h #define CTEST_HEADER_H /header file content #endif Many macro

5, Configuration Plsql A 64-bit Oracle database is installed on a 64-bit system, but there is no corresponding 64-bit PL/SQL Developer, and it is not possible to use PL/SQL Developer for direct connection, so the connection needs to