Is the a c debugger for zOS? I know there is XDC, but I'm not really interested in the assembly. I would rather have one that focuses on C.
Yes, IBM has a Debug Tool for z/OS which allows debugging at a higher level than assembler language.
I think it's separate from the xlc stuff so you'll have to pay for it but, since you're running a mainframe, that probably won't be an issue :-)