8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / topic http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008-12-01T23:19:10-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 What does adding a "u" to a hexadecimal number do? http://www.8051projects.net/forum-t10373.html 2008-12-01T23:19:10-08:00 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! Re: What does adding a "u" to a hexadecimal number do? http://www.8051projects.net/forum-t10373.html 2008-12-01T23:19:10-08:00 sashijoseph I think it forces the value to be an unsigned type...