REPEAT
The REPEAT statement is similar to the while loop, how-ever,
with the repeat statement, the conditional test occurs after
the loop. The program statement(s) which constitute the loop
body will be executed at least once. The format is,
repeat
program statement;
until condition_is_true; {semi-colon depends on next keyword}
There is no need to use the begin/end keywords to group more
than one program statement, as all statements between repeat
and until are treated as a block.