For the children out there.
QuickC was their branding for a 'lite' implementation of Microsoft C in the late 80's. It was cheaper than Microsoft C. Visual C++ did not exist yet. Hell, C++ barely existed at the time. IIRC, it was intended to be a competitor to TurboC from Borland.
The compiler was a bit too quick. i.e. it was pretty buggy. I started with it, and quickly moved on to TurboC. Working with a compiler that could correctly compile a for loop made learning the language a lot easier.
They re-branded GWBasic (bundled with DOS) into QuickBasic. There was also a QuickPascal. IIRC, neither QuickPascal nor QuickC lived very long.