Hi, everyone! I'm new in this forum, so if my thread is in the wrong place, please move it.
I'm looking at a C source code for a C8051F124(8051 based), and I've found the following definition "#define ARP_OPERATION_REQ 0x01u". My question is, what does the "u" letter do with the constant value?

P.S. I suppose, that it have something to do with a little-endian - big-endian compatibility, but I'm not sure.

Thanks in advantage!

I think it forces the value to be an unsigned type...