Zero is an important digit. One may want to locate all the zeros in the code. I think it would be better to have it in red color. Since also, you need to differentiate it from the alphabet O. Currently red is assigned to string literal constants, which is much easy to locate. May be both of them can exchange colors.
Thanks
I want to delete this post. I have a new submission regarding colors of fonts:
https://sourceforge.net/p/dev-cpp/feature-requests/456/