How do I check whether an array contains a particular value?

how do I correctly write this ?:

If number is different from Array[1] to Array[x-1] the begin......

where number is an integer and array is an array of integers from 1 to x

Solution

I believe you want to do something if number is not found in the array MyArray. Then you can do it like this:

NoMatch := True;
for i := Low(MyArray) to High(MyArray) do
  if MyArray[i] = number then
  begin
    NoMatch := False;
    Break;
  end;

if NoMatch then
  DoYourThing;

You could create a function that checks if a number is found in an array. Then you can use this function every time you need to perform such a check. And each time, the code will be more readable. For example, you could do it like this:

function IsNumberInArray(const ANumber: Integer; 
  const AArray: array of Integer): Boolean;
var
  i: Integer;
begin
  for i := Low(AArray) to High(AArray) do
    if ANumber = AArray[i] then
      Exit(True);
  Result := False;
end;

...

if not IsNumberInArray(number, MyArray) then
  DoYourThing;

If you use a old version of Delphi, you have to replace Exit(True) with begin Result := True; Exit; end. In newer versions of Delphi, I suppose you could also play with stuff like generics.