How to solve C++ syntax error: 'expected ')' before '&' token'?

How to solve C syntax error: 'expected ')' before '&' token'?

In the process of C programming, various syntax errors are often encountered. One of the common errors is: "expected ')' before '&' token". This error usually occurs in the parameter list of a function or method, indicating that the compiler cannot understand the missing right parenthesis before a variable or type.

The following will explain in detail how to solve this error and provide some code examples to help us understand better.

First, let us look at a simple sample code:

void myFunction(int& num;
{
    // 函数体
}

In the above code, the right bracket is missing after int& in the parameter list), causing the compiler to report "'expected ' )' before '&' token'" error. The error suggests that we should add a closing bracket before &.

Next, let’s fix this error:

void myFunction(int& num)
{
    // 函数体
}

In the above fixed code, we added the missing right bracket after int& and placed the function body in the correct Location.

Another common situation is that errors occur between the declaration and definition of a class's member function. The following is an example:

class MyClass
{
public:
    void myFunction(int& num;
};

void MyClass::myFunction(int& num)
{
    // 函数体
}

In the above example, a right bracket is missing after the parameter list in the member function declaration of the class, causing the compiler to report "'expected ')' before '&' token '"mistake. We need to add the missing closing bracket after the parameter list.

The fixed code is as follows:

class MyClass
{
public:
    void myFunction(int& num);
};

void MyClass::myFunction(int& num)
{
    // 函数体
}

In addition to these two common situations, this error may also appear in other places. But no matter where it appears, the solution is the same: just add the closing bracket where it is missing.

It is worth noting that this error may appear more than once. The compiler may point out other syntax errors, possibly due to a previous error that resulted in a missing closing parenthesis. Therefore, before solving the missing closing bracket error, we need to carefully check whether there are other errors in the code.

To avoid such errors, we should develop good coding habits and carefully check the code, especially the parameter list of the function or method, to ensure that all closing brackets are placed correctly.

To summarize, when we encounter the C syntax error: "expected ')' before '&' token", we need to carefully check whether the code is missing the right bracket. By adding the missing closing bracket, we can resolve this error and ensure that the code compiles correctly.

I hope the solutions and code examples provided in this article can help everyone, and help understand and solve the "expected ')' before '&' token" error. Happy coding!

The above is the detailed content of How to solve C++ syntax error: 'expected ')' before '&' token'?. For more information, please follow other related articles on the PHP Chinese website!