C++ 错误：预期的非限定 ID
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C++ error: expected unqualified-id
提问by Seb
I'm getting an error "error: expected unqualified-id before '{' token" on line 6.
我在第 6 行收到错误“错误：在 '{' 标记之前预期为非限定 ID”。
I can't tell what's wrong.
我说不出怎么回事。
#include <iostream>
using namespace std;
class WordGame;
{
public:
void setWord( string word )
{
theWord = word;
}
string getWord()
{
return theWord;
}
void displayWord()
{
cout << "Your word is " << getWord() << endl;
}
private:
string theWord;
}
int main()
{
string aWord;
WordGame theGame;
cin >> aWord;
theGame.setWord(aWord);
theGame.displaymessage();
}
采纳答案by Alex Z
There should be no semicolon here:
这里不应该有分号：
class WordGame;
...but there should be one at the end of your class definition:
...但是在类定义的末尾应该有一个：
...
private:
string theWord;
}; // <-- Semicolon should be at the end of your class definition
回答by keelerjr12
As a side note, consider passing strings in setWord() as const references to avoid excess copying. Also, in displayWord, consider making this a const function to follow const-correctness.
作为旁注，请考虑将 setWord() 中的字符串作为常量引用传递以避免过度复制。此外，在 displayWord 中，考虑将其设为 const 函数以遵循常量正确性。
void setWord(const std::string& word) {
theWord = word;
}
回答by Beta
Get rid of the semicolon after WordGame.
去掉后面的分号WordGame。
You really should have discovered this problem when the class was a lot smaller. When you're writing code, you should be compiling about every time you add half a dozen lines.
你真的应该在班级小得多的时候发现这个问题。在编写代码时，每次添加六行代码时都应该进行编译。
回答by VJVJ
Semicolon should be at the end of the class definition rather than after the name:
分号应该在类定义的末尾而不是名称之后：
class WordGame
{
};
回答by Michael Alan Huff
For what it's worth, I had the same problem but it wasn't because of an extrasemicolon, it was because I'd forgotten a semicolon on the previous statement.
无论如何，我遇到了同样的问题，但这不是因为额外的分号，而是因为我忘记了前一条语句中的分号。
My situation was something like
我的情况是这样的
mynamespace::MyObject otherObject
for (const auto& element: otherObject.myVector) {
// execute arbitrary code on element
//...
//...
}
From this code, my compiler kept telling me:
从这段代码中，我的编译器不断告诉我：
error: expected unqualified-id before for (const auto& element: otherObject.myVector) {
etc...
which I'd taken to mean I'd writtten the for loop wrong. Nope! I'd simply forgotten a ;after declaring otherObject.
error: expected unqualified-id before for (const auto& element: otherObject.myVector) {
etc...
我认为这意味着我写错了 for 循环。不！我只是;在声明之后忘记了 a otherObject。
