就是你的main函数声明了好几个!
../my_header.h:43:1: error: multiple types in one declaration 43 | }; | ^ …在我的例子中,第 43 行位于 class MyClass 定义的末尾。 解决方案:在 enum 定义的末尾添加缺少的分号 ( ; ), 如@eguaio here 和@MSalters here 所述。 原文由 Gabriel Staples 发布,翻译遵循 CC BY-SA 4.0 许可...
【注5】前向声明(forward declaration) 结构体类型S在声明之后定义之前是一个不完全类型(incomplete type),即已知S是一个类型,但不知道包含哪些成员。不完全类型只能用于定义指向该类型的指针,或声明使用该类型作为形参指针类型或返回指针类型的函数。指针类型对编译器而言大小固定(如32位机上为四字节),不会出现编译...
complete cost complete declaration complete department o complete digital cert complete failure complete hysterectomy complete lattice-orde complete life table complete locally conv complete mozart editi complete obedience complete observabilit complete operation ru complete prosthodonti complete rest complete sal...
common data storage common data storage a common data system common data translati common declaration st common dialog common dialog box common domain common environment co common event flag common external tempo common factor common field common flowering quin common gateway interf common gateway interf...
Declaration statements are used to declare variables, functions, arrays, and so on. They tell the compiler to create and allocate memory space. For example, int a; Declares an integer variable a. Declaration statements are an integral part of the C language because they provide the data and ...
2.1 用于声明变量 (For Variable Declaration) 在C++中,extern关键字主要用于声明一个变量或函数。当我们使用extern关键字声明一个变量时,我们告诉编译器这个变量在其他地方定义了,这里只是引用它。这样,我们可以在多个文件中共享同一个变量。 例如,我们可以在一个文件(比如main.cpp)中定义一个全局变量int g_var = ...
Multiple__attributes__can be strung together on a single declaration, and this is not uncommon in practice. You can either use two separate__attribute__s, or use one with a comma-separated list: /*send printf-like message to stderr and exit*/ ...
「【注4】声明(declaration)与定义(definition)」 全局变量或函数可(在多个编译单元中)有多处声明,但只允许定义一次。全局变量定义时分配空间并赋初始值(如果有);函数定义时提供函数体内容。 代码语言:javascript 复制 声明: extern int iGlobal;extern intfunc();或intfunc();定义: ...
非常实用的,吸收前辈的经验,我们才能少走弯路。和C 编译器错误信息中文翻译1L15 重复调用WARNING L15: MULTIPLE CALL TO SEGMENTSEGMENT: PRSPIRECEIVEWORDDSPICALLER1: