Difference between revisions of "In"

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(→‎example: prettify code)
(Added range example)
 
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* It is also usable in [[Uses|<syntaxhighlight lang="pascal" enclose="none">uses</syntaxhighlight>‑clauses]].
 
* It is also usable in [[Uses|<syntaxhighlight lang="pascal" enclose="none">uses</syntaxhighlight>‑clauses]].
  
== Example ==
+
== Example #1 ==
 
<syntaxhighlight lang="pascal">
 
<syntaxhighlight lang="pascal">
 
program projectin;
 
program projectin;
Line 56: Line 56:
 
   end;
 
   end;
 
   readln;
 
   readln;
 +
end.
 +
</syntaxhighlight>
 +
 +
==Example #2==
 +
<syntaxhighlight lang="pascal">
 +
const Test: char = 'q';
 +
 +
begin
 +
  if (Test in ['0'..'9']) then
 +
    Writeln('Digit')
 +
  else if (Test in ['A'..'z']) then
 +
    Writeln('Letter')
 +
  else
 +
    Writeln('Other');
 
end.
 
end.
 
</syntaxhighlight>
 
</syntaxhighlight>

Latest revision as of 22:56, 4 May 2022

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The reserved word in:

  • It tests whether a value is in a set. It returns the boolean value true if the value belongs to the set and false if the value does not belong to the set.
  • It is also used with the reserved word for in for-in loop.
  • It is also usable in uses‑clauses.

Example #1

program projectin;
uses SysUtils, TypInfo;
type
  Berry = (Blueberry, FlyHoneysuckle, Lingonberry, Raspberry, Snowberry, Strawberry);
  Berries = set of berry;
var
   basket: Berries;
   someberry: berry;
   str: string;
   i: integer;
begin
  basket := [];
  writeLn('Choose a berry from the following berries into your basket');
  repeat
    i := 1;
    for someberry in berry do
      begin
        Str := GetEnumName(TypeInfo(Berry),ord(someberry));
        writeln(i,' : ',Str);
        inc(i);
      end;
    writeln('0 : exit');
    writeln;
    readln(i);
    if i>0 then
      begin
        someberry :=Berry(i-1);
        Include(basket, someberry);
      end;
  until  i=0;
  if (FlyHoneysuckle in basket) or (Snowberry in basket) then
   begin
     writeln('You have poisonous berries in your basket');
     if FlyHoneysuckle in basket then
       writeln('Your basket has a poisonous Fly honeysuckle!') ;
     if Snowberry in basket then
       writeln('Your basket has a poisonous Snowberry!');
   end;
  writeln('So you had these berries in your basket:');
  for someberry in basket do
  begin
    Str := GetEnumName(TypeInfo(Berry), Ord(someberry));
    writeln(Str);
  end;
  readln;
end.

Example #2

const Test: char = 'q';

begin
  if (Test in ['0'..'9']) then
    Writeln('Digit')
  else if (Test in ['A'..'z']) then
    Writeln('Letter')
  else
    Writeln('Other');
end.