Two Problems Encountered

Yesterday I encountered two problems that let me solve for a long time. They were a tough problem. The first one found that there was always no compilation problem, and the link was always wrong. After checking for a long time, when the problem is found, the header file contains each other, and then declare in a file, in. CPP file. The second problem is even worse. It is also a link problem. After searching for a long time, I found that the files under one file have the same name as the files in another folder. Then I can change the corresponding one to lower case, finally, we found that Windows does not differentiate the size. Linux seems to support it. These two problems have been blocked for a long time. In the final analysis, the reason is that C ++ has a poor foundation.