Scope of switch statements

[peter]

In article <1989Nov9.200639.8868 at utzoo.uucp> henry at utzoo.uucp (Henry Spencer)
writes:
|In article <15743 at bloom-beacon.MIT.EDU> tada at athena.mit.edu (Michael J Zehr)
|writes:
|>There was a recent article in comp.lang.c on obfuscated use of switches
|>and labels mixed together which i decided to try to compile using DEC's
|>VAX C (VMS) compiler:
|>#include <stdio.h>
|>main() {
|>  int i, j=1, k=1;
|>  for(i=0; i<=2; ++i) 
|>    switch(i) {
|>      case 0: for(; ++k % 3; ++j) {
|>      case 1:   printf(" j = %d,", j);
|>      case 2:   printf(" k = %d,", k);
|>              }
|>    }
|>}
|>
|>(i've reduced the code to just the section i have a question concerning)
|>
|>on the '1' and '2' case lines, the compiler gives an error "case labels
|>are valid only in "switch" statements."
|>
|>is this obfuscated code not ANSI or is the compiler broken?  
|
|It is legal, although ugly, ANSI C.  Also legal (but ugly) traditional C.
|Dennis Ritchie himself has officially blessed this disgusting construct,
|and indeed it has one or two legitimate uses.

(Michael Zehr's original posting added for clarity)

I've stared at this and can't make sense of it.  Could someone provide me
with enlightenment?
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