[solved] how to access variable names by number
lazarus / 21-General

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Muso · 2021-04-18 17:41

This is propably a noob question but googling around did not help me:

I have to parse a text file with one line. The line contains a comma
separated list of values and each value has to be stored into a new
variable.

So what I am looking for is a for loop that reads out a value, created
a new variable and assign it. So something in this form:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i  
posPrevInt:= 0;  counterInt:= 1;  for i:= 1 to 16 do  begin 
 posCurrInt:= Pos(',', ReadString, posPrevInt);   DummyString:=
Copy(ReadLine, posPrevInt, posCurrInt- posPrevInt);   if not
TryStrToFloat(DummyString, Gain1) then    exit;   posCommaPrev:=
posCommaCurr;   inc(counterInt);  end;
Instead of "Gain1" I want to assign the variables Gain1, then Gain2,
then Gain3,...

So is there a way to declare the variable name using a number like
"Gain+posPrevInt:= " or having the variables in an array to access
them?

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wp · 2021-04-18 17:51

The easiest way to split a comma-separated list into an array is by
using the Split string helper (untested):

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i type 
TFloatArray: array of Double; function GetGains(AString: String; out
Gains: TFloatArray): Boolean;var  sa: TStringArray;  i: Integer;begin 
sa := AString.Split(',');  SetLength(Gains,Length(sa));  for i := 0 to
High(sa) do    if not TryStrToFloat(sa[i], Gains[i]) then    begin   
 Gains := nil;      Result := false;      exit;    end;  Result :=
true;end;

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Muso · 2021-04-18 19:06

Quote from: wp on April 18, 2021, 07:51:59 pmThe easiest way to split
a comma-separated list into an array is by using the Split string
helper (untested):

Many thanks, works like a charm.