在C语言中,#define用于定义宏,可以用来定义常量、函数、表达式等。宏定义的格式为#define 宏名 宏体。例如: #define PI 3.14159 #define SQUARE(x) ((x) * (x)) 复制代码 在上面的例子中,PI被定义为常量3.14159,SQUARE被定义为一个计算平方的函数。 在使用宏定义时,可以通过#define定义一些常用的函数或常量...
Read: Complex macro with arguments (function like macro) in C language.2) #undef - Un defining a defined macro#unndef directive is used to un define a defined macro in source code, macro must be defined if you are trying to un defining a macro....
C语言--define定义 预定义符号__FILE__;//路径加文件名 __LINE__;//当前代码行号 __DATE__;//日期 __TIME__;//时间 __FUNCTION__;//当前函数名#define语句结束最好不加分号。#define定义宏#define name(参数) 表达式定义宏的时候要考虑预算符优先级的影响,不要吝啬括号。栗子1--##define PRINT(X...
Function like Macro:These macros function in the same way as a function call does. Instead of a function name, it substitutes the whole code. It is required to use a pair of parentheses following the macro name. A function-like macro’s name is only prolonged if and only if it is foll...
This C tutorial explains how to use the #define preprocessor directive in the C language. In the C Programming Language, the #define directive allows the definition of macros within your source code.
(int x){return(a)*x;}FUNCTION(quadruple,4)FUNCTION(double,2)#undefFUNCTION#defineFUNCTION34#defineOUTPUT(a)puts(#a)intmain(void){printf("quadruple(13): %d\n",fun_quadruple(13));printf("double(21): %d\n",fun_double(21));printf("%d\n",FUNCTION);OUTPUT(million);//note the lack ...
01 作用域 预编译作用域限本文全局,如: a.c中定义:#defineTEST 1 b.c中定义:#defineTEST 2 两者编译不交叉,互不影响。 若需#defineTEST作用于a.c、b.c,可在a.c、b.c所添加的test.h中加入“#defineTEST”。 02 一般用法 #define 作用域
例子:用 __FUNCTION__ 打印跟踪函数调用 Windows API 中的注释性宏 Windows API 中的常用宏 类型辅助类 GDI 类 错误处理类 标记没有使用的参数、变量辅助宏 错误码、状态码 调用规范类 国际化类 资源类 网络类 字符串化操作符 # 用# 操作构造字符串化宏 STRINGIZE ...
Here, we will learnhow to create a function like Macro that should use printf() in C language? ByIncludeHelpLast updated : March 10, 2024 We can useprintf()function in a Macro. In this example, we are creating afunction like Macro that will print the result of a calculation, like...
For C language to load the function within another function it's better to include the definition within the form just like long f(x) integer x; long a(int); long b(int); long c(int); longt d(int); ... i am not quite clear how it can be finished in Fortran. Would any one...