Integrating with C program

I’m working on a program that has to generate and print some reports for my dads company. I hadn’t even thought of how I was going to go about doing that considering this will be my first program in C. I was hoping to build it in Ruby or Python but the further I got the more I realized it wasn’t going to work out app that well; so I decided to learn C and use that language instead so that way it wouldn’t have to run through an interpreter. So I’m wondering if there were any tips you might have to possibly integrating your pdf program. It’s a personal build and I’m not going to distribute it unless it comes out flawless and if it did I would contact you about doing so. Thanks for any help.