未声明的枚举错误 [英] Undeclared enumeration error

问题描述

你好，我在包含之后声明了这样的错误''LETTERS'' undeclared (first use in this function). LETTERS:

Hello, I get this error ''LETTERS'' undeclared (first use in this function). LETTERS in declared after the includes like this:

enum LETTERS{
A = 0,B = 1,C = 2,D = 3,E = 4
}

然后在主要的空白中，我得到那个烦人的错误:

then in the main void I get that annoying error:

int main(void) {
        int Word[] = {LETTERS.A,LETTERS.C,LETTERS.E};
    }
}

如何摆脱这个错误?

注意:这发生在AVR Studio 5

How can I get rid of this error?

Note:This happens in AVR Studio 5

推荐答案

LETTERS是类型名，而不是结构的实例中.如果要引用结构化类型的元素，则需要像这样使用范围解引用运算符''::'':

LETTERS is a typename, not an instance of a struct. If you want to refer to elements of a structured type, you need to use the scope dereferencing operator ''::'' like this:

LETTERS::A

使用

int Word[] = {A,C,E};

->首先，您的Enum声明应以分号结尾.
->由于枚举类型用于设置命名整数常量，因此无法像使用struct或class一样使用点运算符访问其成员.
->因此，可以通过直接使用其成员来像#define-d常量一样使用它们.

例如:int nVar = A;

Hi,

-> First of all your Enum declaration should end with a semicolon.
-> Since enum type is used to set up named integer constants,you cant access its members with dot operator like you do with struct or class.
-> So you can use them like a #define-d constants by using its members directly.

example: int nVar = A;

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