BDS C, now *that* brings back some memories. I remember absolutely *hating* to put printf in my programs because it made the executables 4K larger. It was incredibly fast, too. You'd just have a few of clink-clunks (disk accesses) and your program would be compiled. Until Turbo Pascal, it was the hottest thing going (for me, at least).
On that node, anyone wanting an AMPRO or two, complete with manuals, CP/M manuals and disks, just let me know and pay shipping. (Ampro: a single board computer that you would solder together. Z-80 based, the board was the same footprint as a 5-1/4" floppy drive, so you could attach it to the side of a drive to make a small embedded system. They were pretty fun toys.)