This C tutorial explains how to use the #define preprocessor directive in the C language. Description In the C Programming Language, the #define directive allows the definition of macros within your source code. These macro definitions allow constant values to be declared for use throughout your ...
There are several preprocessor commands that exist in the C language. # define and # undef are the most important preprocessor command present in the C language. Each of them has some unique features. In this topic, we will discuss in detail # define and # undef. What is Preprocessor? Bef...
Complex macro with arguments (function like macro) in C language C language #ifdef, #else, #endif Pre-processor with Example C language #if, #elif, #else, #endif Pre-processor with Example Parameterized Macro - we cannot use space after the Macro Name ...
__in_zconstwchar_t *_File, __inunsigned_Line);3#define assert(_Expression) (void)( (!!(_Expression)) || (_wassert(_CRT_WIDE(#_Expression), _CRT_WIDE(__FILE__), __LINE__), 0) )45// crtdbg.h6#define _ASSERT_EXPR(expr, msg) \7(void) ((!!(expr)) || \8(1 != _C...
For instance, you might use it to print the value of an expression as well as the expression itself (for debugging purposes). PRINT_TOKEN(x + y); 参考: 1、The C Preprocessor 2、Preprocessor directives
Preprocessor directives Preprocessor directives #define directive (C/C++) #error directive (C/C++) #if, #elif, #else, and #endif directives (C/C++) #ifdef and #ifndef directives (C/C++) #import directive (C++) #import attributes (C++) #include directive (C/C++) #line directive (C/C++)...
The scope of a symbol created by using #define is the file in which it was defined. See#iffor an example of how to use #define. See Also Concepts C# Programming Guide Reference C# Preprocessor Directives const (C# Reference) Other Resources ...
The #define directive must appear in the file before you use any instructions that aren't also preprocessor directives.You can also define a symbol with the /define compiler option. You can undefine a symbol with #undef.A symbol that you define with /define or with #define does not ...
Overriding Property Sheet on the Command Line in MSBuild Is there a way to define preprocessor definition in project properties? What are preprocessor directives in MSBuild? How do I set the preprocessor in Visual Studio C++? How to modify the preprocessor definitions in the GUI?
The preprocessor directives are used by the compiler to preprocess the source code before compiling it. The directive always begins with#, therefore the compiler prohibits using the symbol in names of variables, functions etc. Each directive is described by a separate entry and is valid until the...