comment on

Dijkstra aparently coined this: "looping n and a half times" (or the "loop and a half" as some people have shortened it) back in 1973. Knuth mentioned it as one of the main reasons for using goto in his 1974 "Structured Programming with go to Statements" (which does not seem to be available online unless you are an ACM member) ...

A: S;
   if  B  then  goto  Z   fi;
   T;
   goto  A;
Z:
[download]

He mentions several alternatives that he finds inferor to the goto version for various reasons, and credits Ole-JOhan Dahl as proposing a syntax he really like -- which frankly I think kicks ass, and plan on writting as a P6 macro (I think macro is the right word)...

loop;  S  while !B:  T;  repeat;
[download]

or in the more practical perlish way...

loop {
     S;
} while (!B) {
     T;
}
[download]

In reply to Re^2: Control Structures by hossman
in thread Control Structures by artist

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