Yep. I learned Pascal in high school, but when I got my first Mac in college and needed to write apps for it, I fumbled with Symantec's Think Pascal for a while and ditched it for Think C in short order, even though I was still learning C at the time (and managed to completely corrupt my hard drive requiring a full reinstall because I used the low-level I/O APIs incorrectly).

You can do a lot in Pascal, and Delphi was an outstanding development environment for Windows app, but C is just so much more powerful.