関連ワード:  how to write a header file c++    how to write a .h file c++    how to make a header file c++    how to make a .h file c++    how to make a header file in c++ vscode    how to create a header file in c++ xcode    how to create a header file in c++ in code blocks    how to create a header file in dev c++    how to create a header file in visual studio c++    how to make a class header file in c++