Complex macro with arguments in C We can also define a macro with arguments, so that a macro may use at different places with different values. These values pass in the macro definition with the help of arguments. Arguments must be used each time of macro calling. ...
How to define a complex macro with argument (function like macros)?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 ...
To define a macro that uses arguments, you write a`#define'command with a list ofargument namesin parentheses after the name of the macro. The argument names may be any valid C identifiers, separated by commas and optionally whitespace. The open-parenthesis must follow the macro name immediate...
The process of replacing a macro call with the processed copy of the body is called expansion of the macro call.In practical terms, there are two types of macros. Object-like macros take no arguments. Function-like macros can be defined to accept arguments, so that they look and act like...
// macro constants, depending on the value of x double d = std::sqrt(-1.0); // 1.0 / 0.0; switch (std::fpclassify(d)) { case FP_INFINITE: printf("infinite"); break; case FP_NAN: printf("NaN"); break; // NaN case FP_ZERO: printf("zero"); break; ...
预处理(或称预编译)是指在进行编译的第一遍扫描(词法扫描和语法分析)之前所作的工作。预处理指令指示在程序正式编译前就由编译器进行的操作,可放在程序中任何位置。 预处理是C语言的一个重要功能,它由预处理程序负责完成。当对一个源文件进行编译时,系统将自动引用预处理程序对源程序中的预处理部分作处理,处理完...
当被调用时,在宏体(macro body)中,那些符号序列集合将代替里面的__VA_ARGS__标识符。更多的信息可以参考CPP手册。 GCC始终支持复杂的宏,它使用一种不同的语法从而可以使你可以给可变参数一个名字,如同其它参数一样。例如下面的例子: #definedebug(format, args...) fprintf (stderr, format, args)...
1 Sample macro Here, TRACE_LOG is the macro defined. First, character string is logged by TRACE_LOG macro, then multiple arguments of different types are also logged as shown in second call of TRACE_LOG macro. Variable arguments are supported with the use of “…” in input argument of ...
Macro argument syntax error 宏参数语法错误 Macro expansion too long 宏的扩展以后太长 Mismatched number of parameters in definition 定义中参数个数不匹配 Misplaced break 此处不应出现break语句 Misplaced continue 此处不应出现continue语句 Misplaced decimal point 此处不应出现小数点 ...
59: Macro argument syntax error — 宏参数语法错误60: Macro expansion too long — 宏的扩展以后太长61: Mismatched number of parameters in definition — 定义中参数个数不匹配62: Misplaced break — 此处不应出现break语句63: Misplaced continue — 此处不应出现continue语句64: Misplaced decimal point —...