菜鸟请教简单c++问题，请问如何改正？为什么？十分感谢！！！

Question

菜鸟请教简单c++问题，请问如何改正？为什么？十分感谢！！！

C:\Users\dell\Desktop\execisiii\0.cpp|12|error: field 'w' has incomplete type|
C:\Users\dell\Desktop\execisiii\0.cpp||In member function 'void s::set()':|
C:\Users\dell\Desktop\execisiii\0.cpp|20|error: 'w' was not declared in this scope|
C:\Users\dell\Desktop\execisiii\0.cpp|21|error: 'W' was not declared in this scope|
C:\Users\dell\Desktop\execisiii\0.cpp||In member function 'void s::show()':|
C:\Users\dell\Desktop\execisiii\0.cpp|27|error: 'w' was not declared in this scope|
||=== Build failed: 4 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|

Answer 1

红红火火，恍恍惚惚，看不清。但从编译结果来看，这是错误，而不是bug。