expected expression before '...' token #define time_table_debug(fmt,...) printf(fmt,...)
时间: 2023-12-13 11:03:49 浏览: 28
这个错误通常是由于宏定义中的可变参数列表没有给出参数名称导致的。在宏定义中,使用...表示可变参数列表,但是在宏定义中没有给出参数名称,导致编译器无法识别这些参数。解决这个问题的方法是在宏定义中给出参数名称,例如:
```
#define time_table_debug(fmt, ...) printf(fmt, ##__VA_ARGS__)
```
在这个宏定义中,使用了##运算符来处理可变参数列表,保证即使没有传入任何参数,编译也不会出错。同时,在参数名称前面使用了__VA_ARGS__,表示参数列表中的所有参数。这样,在调用宏时,可以像调用printf函数一样传入参数,例如:
```
time_table_debug("当前时间是:%d:%d:%d\n", hour, minute, second);
```
这样就可以正确输出调试信息了。
相关问题
expected primary expression before '.'token
This error message typically occurs in programming languages like C++ or Java, and it means that the code contains a syntax error.
The error message "expected primary expression before '.' token" usually indicates that there is a problem with the code syntax, particularly with the use of a dot (.) character. This character is often used to access properties or methods of objects in object-oriented programming.
Possible causes of this error include:
- Missing or incorrect syntax, such as forgetting to declare a variable or function before using it, or using the wrong type of variable or function.
- Incorrect use of the dot (.) operator, such as using it on a non-object or non-class element, or using it with incorrect syntax.
- Incorrect placement of the dot (.) operator, such as using it in a place where it is not allowed or expected.
To fix this error, you can try checking the syntax of the code and ensuring that all variables and functions are properly declared and used. You can also double-check the use of the dot (.) operator and make sure it is used correctly and in the right place.
expected primar-expression before '.' token
这个错误通常是因为语法不正确导致的。请确认您的代码中是否有以下情况:
1. 没有正确引入头文件或命名空间。
2. 对于非类成员函数或全局函数,不能使用"."运算符。
3. 对于指针,应该使用 "->"运算符而不是"."运算符。
如果以上情况都没有出现,请提供更多的代码和错误信息,以便我可以更好地帮助您解决问题。