On 6/17/23 2:07 PM, Travis Siegel via fpc-pascal wrote:
This is interesting, because it's the first time I've ever seen "break" as a
valid command in pascal, and I've been using pascal since the mid/late 80s. All
kinds of dialects too, and I've never seen break as a keyword. C, Python, Perl,
sure, even shell scripts, but pascal? Never seen it used before. Is this a
relatively new addition to fpc or something?
the Break keyword first appeared in Turob/Borland Pascal 7.0 along with the
Continue keyword... to refresh my memory, i searched the various reference
manuals for TP/BP versions... the first one that did not have "break" as part of
CheckBreak, CBreak, and similar was TP/BP 7.0...
http://bitsavers.informatik.uni-stuttgart.de/pdf/borland/turbo_pascal/Turbo_Pascal_Version_7.0_Language_Guide_1992.pdf
page 86:
If the number of repetitions is known beforehand, the for statement is the
appropriate construct. Otherwise, the while or repeat statement should be used.
The Break and Continue standard procedures can be used to control the flow of
repetitive statements: Break terminates a repetitive statement, and Continue
continues with the next iteration of a repetitive statement. For more details on
these standard procedures, see Chapter I, "Library reference," in the
Programmer's Reference.
http://www.bitsavers.org/pdf/borland/turbo_pascal/Turbo_Pascal_Version_7.0_Programmers_Reference_1992.pdf
page 15:
Break procedure System
-------------------------------------------------------------------------
Purpose Terminates a for, while, or repeat statement.
Declaration procedure Break;
Remarks Break exits the innermost enclosing for, while, or repeat
statement immediately. Break is analogous to a goto statement
addressing a label just after the end of the innermost
enclosing repetitive statement. The compiler reports an error
if Break is not enclosed by a for, while, or repeat statement.
See also Continue, Exit, Halt
Example
var S: string;
begin
while True do
begin
Readln(S);
if S = '' then Break;
Writeln(S);
end;
end.
--
NOTE: No off-list assistance is given without prior approval.
*Please keep mailing list traffic on the list where it belongs!*
_______________________________________________
fpc-pascal maillist - fpc-pascal@lists.freepascal.org
https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
