When you write programs , there are some important stylistic things that you should do to make your program clear and well-structured. Below is a list of these requirements:

1. Check the return value of all system or library calls.
2. There should be no more than one class per file.
3. For non-template classes, the interface definition part of the class should be in a .h file and the implementation of the methods should be in a .C (or .cc) file.
4. Always indent when statements are part of a control-flow statement such as "if" or "while". Choose a reasonable number of characters (such as 3 or 4) and make sure that you indent consistently.
5. There should be constants other than, perhaps, zero or one, in your code. Any constant values should preferably be defined as using a "const" declaration or.
6. Public data members are a really bad idea, in general. If you think that you need one, please come and talk with Me. They are not acceptable in your program without prior permission.
7. Comments:
   • Each file should have a comment at the top with at least the authors' names
   • Each function or method should have a comment at the beginning summarizing what it does and, if it is not obvious, how it does it.
   • For long functions or method, you should include a comment at reasonable intervals. The intervals should break the function into logical chunks. The comment should summarize what the chunk does.
8. You must use a "makefile" for your program. The default rule should build the whole program.
9. You can use any class and method in the Standard Template Library (STL).