Uploaded even earlier gdscript implementation.

Euler.gd

@@ -0,0 +1,36 @@
+class_name EulerCalculator extends Control
+
+
+
+func _on_test_button_down() -> void:
+	var answer:int = calc_biggest_palindromic_number(2)
+	show_result(answer)
+
+func _on_calculate_button_down() -> void:
+	var answer:int = calc_biggest_palindromic_number(3)
+	show_result(answer)
+
+func show_result(answer:int) -> void:
+	$VBoxContainer/Label.text = str(answer) 
+
+func calc_biggest_palindromic_number(digits:int) -> int:
+	var highest_palindrome:int = -1
+	var min:int=pow(10,digits-1)
+	var max:int=pow(10,digits)
+	for a in range(min, max):
+		for b in range(min, max):
+			var p:int = a*b
+			var arr:Array = [0]
+			for k in range(1, digits*2+1):
+				var unit:int = p % (pow(10,k) as int)
+				unit /= (pow(10,k-1) as int)
+				arr.append(unit)
+			arr.remove_at(0)
+			if arr.size() != digits*2:
+				continue
+			var is_palindrome:bool = true
+			for k in range(0,digits):
+				is_palindrome = is_palindrome and arr[k] == arr[digits*2-k-1]
+			if is_palindrome and highest_palindrome<p:
+				highest_palindrome = p
+	return highest_palindrome

Euler.tscn

@@ -0,0 +1,48 @@
+[gd_scene load_steps=3 format=3 uid="uid://cn5rxob16gaic"]
+
+[ext_resource type="Script" path="res://Euler.gd" id="1_pj7ep"]
+
+[sub_resource type="LabelSettings" id="LabelSettings_dpjfj"]
+font_size = 50
+outline_size = 10
+outline_color = Color(0, 0, 0, 1)
+
+[node name="Euler" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_pj7ep")
+
+[node name="VBoxContainer" type="VBoxContainer" parent="."]
+layout_mode = 1
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -75.5
+offset_top = -71.0
+offset_right = 75.5
+offset_bottom = 71.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="Test" type="Button" parent="VBoxContainer"]
+layout_mode = 2
+text = "Test
+"
+
+[node name="Calculate" type="Button" parent="VBoxContainer"]
+layout_mode = 2
+text = "Calculate"
+
+[node name="Label" type="Label" parent="VBoxContainer"]
+layout_mode = 2
+text = "Result"
+label_settings = SubResource("LabelSettings_dpjfj")
+
+[connection signal="button_down" from="VBoxContainer/Test" to="." method="_on_test_button_down"]
+[connection signal="button_down" from="VBoxContainer/Calculate" to="." method="_on_calculate_button_down"]

EulerProject.ino

@@ -1,24 +0,0 @@
-#include "Timer.h"
-
-#include "ProblemBase.hpp"
-#include "Problem3.hpp"
-
-Problem3 problem = Problem3();
-Timer timer(MICROS);
-// Initialize serial connection
-void setup() {
-  Serial.begin(9600);
-  Serial.println("Start calculating...");
-  timer.start();  // start the timer
-}
-
-// Calculation loop
-void loop() {
-  if (problem.Step()) {
-    // Print solution
-    Serial.println("Result = " + String(problem.output) + " in " + String(timer.read()) + "us");
-    timer.stop();
-    delay(100);
-    exit(0);
-  }
-}

Problem1.cpp

@@ -1,21 +0,0 @@
-#include "Problem1.hpp"
-
-Problem1::Problem1() {
-  input = 1000;
-}
-
-bool Problem1::Step() {
-  // add all factors of 3 under input
-  factor3 += 3;
-  if (factor3 < input) output += factor3;
-
-  // add all factors of 5 under input but skip factors of 3
-  factor5 += 5;
-  if (factor5 < input) {
-    factor5_tick++;
-    if (factor5_tick != 3) output += factor5;
-    else factor5_tick = 0;
-  }
-
-  return input < factor3 && input < factor5;
-}

Problem1.hpp

@@ -1,18 +0,0 @@
-#ifndef Problem1_h
-#define Problem1_h
-
-#include "ProblemBase.hpp"
-
-class Problem1 : public ProblemBase {
-
-private:
-  unsigned long factor3 = 0;
-  unsigned long factor5 = 0;
-  unsigned long factor5_tick = 0;
-
-public:
-  Problem1();
-  bool Step();
-};
-
-#endif

Problem2.cpp

@@ -1,19 +0,0 @@
-#include "Problem2.hpp"
-#include "Arduino.h"
-
-Problem2::Problem2() {
-  input = 4000000;
-}
-
-bool Problem2::Step() {
-  // Sum fibonacci values
-  if ((fibonacci & 0b1) == 0) output += fibonacci;
-
-  // calculate next fibonacci value
-  fibonacci = value1 + value2;
-  value1 = value2;
-  value2 = fibonacci;
-
-  // stop if fibonacci value over max
-  return input < fibonacci;
-}

Problem2.hpp

@@ -1,18 +0,0 @@
-#ifndef Problem2_h
-#define Problem2_h
-
-#include "ProblemBase.hpp"
-
-class Problem2 : public ProblemBase {
-
-private:
-  unsigned long value1 = 0;
-  unsigned long value2 = 1;
-  unsigned long fibonacci;
-
-public:
-  Problem2();
-  bool Step();
-};
-
-#endif

Problem3.cpp

@@ -1,41 +0,0 @@
-#include "WString.h"
-#include "HardwareSerial.h"
-#include "Problem3.hpp"
-#include "Arduino.h"
-#include "Vector.h"
-
-Problem3::Problem3() {
-  fl_input = 600851475143;
-
-  unsigned long primeArray[] = { 2 };
-  primes = Vector<unsigned long>(primeArray, 1);
-}
-
-bool Problem3::Step() {
-  Serial.println("iterator = " + String(iterator));
-  // Find prime
-  bool isPrime;
-  Serial.println("known primes = " + String(primes.size()));
-
-  for (unsigned long prime : primes) {
-    Serial.println("prime = " + String(prime));
-    isPrime = iterator % prime != 0;
-    if (!isPrime) break;
-  }
-
-  // Current value is new prime
-  if (isPrime) {
-    primes.push_back(iterator);
-    Serial.println("Found prime = " + String(iterator));
-    // Is number factor of input
-    if (fl_input / iterator == floor(fl_input / iterator)) {
-      // Save current prime as biggest prime and promote other factor as new max.
-      Serial.println("Found prime factor = " + String(iterator));
-      output = iterator;
-      fl_input = fl_input / iterator;
-    }
-  }
-  iterator++;
-  delay(1000);
-  return fl_input < iterator;
-}

Problem3.hpp

@@ -1,19 +0,0 @@
-#ifndef Problem3_h
-#define Problem3_h
-
-#include "ProblemBase.hpp"
-#include "Vector.h"
-
-class Problem3 : public ProblemBase {
-
-private:
-  Vector<unsigned long> primes;
-  unsigned long iterator = 2;
-  float fl_input;
-  
-public:
-  Problem3();
-  bool Step();
-};
-
-#endif

ProblemBase.hpp

@@ -1,16 +0,0 @@
-#ifndef ProblemBase_h
-#define ProblemBase_h
-
-class ProblemBase {
-
-public:
-  unsigned long output;
-
-protected:
-  unsigned long input;
-
-public:
-  virtual bool Step();
-};
-
-#endif

README.md

@@ -1,3 +1,7 @@
 # ProjectEuler
-My source code for project Euler solutions
-Extra challenge: All algorithms are run on an Arduino
+
+My source code for project Euler solutions.
+
+
+
+Implemented in gdscript.

icon.svg

@@ -0,0 +1 @@
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icon.svg.import

@@ -0,0 +1,37 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c4suj7a7mivr7"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
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+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
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+
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+editor/convert_colors_with_editor_theme=false

project.godot

@@ -0,0 +1,16 @@
+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="GD-Euler"
+run/main_scene="res://Euler.tscn"
+config/features=PackedStringArray("4.0", "Forward Plus")
+config/icon="res://icon.svg"