>>Bill,
>>
>>An interesting anecdote for you.
>>
>>Kernin and Ritchie wrote C in C so they ahd a language to use to write Unix. It is named C because A and B didn't work.

According to The C Programming Language by Brian W. Kernigan and Dennis M. Ritchie (c)1978:

"Many of the most important ideas of C stem from the considerably older, but still quite vital, language BCPL, developed by Martin Richards. The influence of BCPL on C proceeded indirectly through the language B, which was written by Ken Thompson in 1970 for the first UNIX system on the PDB-7."
(pg. 2)

There is no reference to any language named A.
BCPL is Basic Compiled Programming Language and has no relation to BASIC.

>>
>>I would bet a dollar that VC++ is written in VC++. Sort a chicken and egg situation.
>
>Interesting. Thanks Jim. I didn't know C was written in C, tho I did know that C was the "result" of A and B ( the languages, not algebra :-) ).
>
>But would VC++6 be written in VC++5 ( similar to VB6, VFP6, etc. )? And if so, how do the previous C bugs propagate to the new version?

The types of operations performed by a compiler are low level and do not have direct correspondence to the source language. The compiler could be written in any language the provides the required operators. The first compiler was an assembler written in machine code. A compiler for any language can be written in any other language that is capable of the required I/O. It is just that some languages have features or syntax that make them better suited to the task of implimenting a compiler.