Working with long long in C

**kenshi** · 12-02-2001, 04:37 PM

Hello again. If you've read the programming challenge thread, you'll know I made a factoring program that I'm trying to convert to 64-bit. I have two problems. The first is getting a 64-bit value from the prompt. Here is the line from my source code that should do it. "number" is an unsigned long long by the way.

Code:

number=strtoull(argv[1],0,10);

The second passed value is 0 because I want it to discard errors the user types. I'm not putting in error protection right now. So this works for numbers below 2 ^ 32, but after that it returns false numbers. I can't see what the failure is.

Also, is there a way to print long long integers with printf or a similar function? I'd even settle for a function that converts it to a string, but it would be very hard to make my own. Any ideas? Thanks.