Hi all, I'm doing a little programming at the moment using Dev-C++. I'm writing a windows program, and have all of the stuff like menus, dialog boxs etc sorted out, and now need to get onto the programming that makes the program achieve something. In the program I will be dealing with very large numbers (at first about 50 to 75 digit numbers, but I am hoping to extend this to around 150 digits once I have a working prototype). I will be doing mathematics with only integers, and will be doing large exponentials (a^(a very large number)), and modulus functions; however, I need near perfect precision, so no rounding. My questions are: 1. Are there any libaries that I will need (or could use) that are not included in the standard windows API? (this may be a difficult question to answer, since this depends on IDE and updates but try your best anyway). 2. How would I integrate them into my program? (Again a bit vague given that I haven't actually said what my program will do). Any help would be kind, thank you.