Added solution to problem 26

ProjectEulerCS/ProblemSelection.cs

@@ -32,7 +32,7 @@ namespace ProjectEulerCS{
 		private static readonly List<int> _PROBLEM_NUMBERS = new List<int>()
 				{ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9,
 				 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-				 20, 21, 22, 23, 24, 25, 67};
+				 20, 21, 22, 23, 24, 25, 26, 67};
 		public static System.Collections.Generic.List<int> PROBLEM_NUMBERS{
 			get { return _PROBLEM_NUMBERS; }
 		}
@@ -66,6 +66,7 @@ namespace ProjectEulerCS{
 				case 23: problem = new Problem23(); break;
 				case 24: problem = new Problem24(); break;
 				case 25: problem = new Problem25(); break;
+				case 26: problem = new Problem26(); break;
 				case 67: problem = new Problem67(); break;
 			}
 			return problem;

ProjectEulerCS/Problems/Problem26.cs

@@ -0,0 +1,133 @@
+//ProjectEuler/ProjectEulerCS/src/Problems/Problem26.cs
+//Matthew Ellison
+// Created: 09-11-20
+//Modified: 09-11-20
+//What is the index of the first term in the Fibonacci sequence to contain 1000 digits?
+//Unless otherwise listed all non-standard includes are my own creation and available from https://bibucket.org/Mattrixwv/CSClasses
+/*
+	Copyright (C) 2020  Matthew Ellison
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+
+using System.Collections.Generic;
+
+
+namespace ProjectEulerCS.Problems{
+	public class Problem26 : Problem{
+		//Variables
+		//Static variables
+		private const int TOP_NUM = 999;	//The number of digits needed in the number
+		//Instance variables
+		private int longestCycle;	//The length of the longest cycle
+		private int longestNumber;	//The starting denominator of the longest cycle
+		public int LongestCycle{
+			get{
+				if(!solved){
+					throw new Unsolved();
+				}
+				return longestCycle;
+			}
+		}
+		public int LongestNumber{
+			get{
+				if(!solved){
+					throw new Unsolved();
+				}
+				return longestNumber;
+			}
+		}
+		public override string Result{
+			get{
+				if(!solved){
+					throw new Unsolved();
+				}
+				return $"The longest cycle is {longestCycle} digits long\nIt started with the number {longestNumber}";
+			}
+		}
+
+		//Functions
+		//Constructor
+		public Problem26() : base($"Find the value of d <= {TOP_NUM} for which 1/d contains the longest recurring cycle in its decimal fraction part."){
+			longestCycle = 0;
+			longestNumber = 0;
+		}
+		//Operational functions
+		//Solve the problem
+		public override void Solve(){
+			//If the problem has already been solved do nothing and end the function
+			if(solved){
+				return;
+			}
+
+			//Start the timer
+			timer.Start();
+
+			//Start with 1/2 and find out how long the longest cycle is by checking the remainders
+			//Loop through every number from 2-999 and use it for the denominator
+			for(int denominator = 2;denominator <= TOP_NUM;++denominator){
+				List<int> denomList = new List<int>();
+				bool endFound = false;	//A flag for when we have found an end to the number (either a cycle or a 0 for remainder)
+				bool cycleFound = false;	//A flag to indicate a cycle was detected
+				int numerator = 1;	//The numerator that will be divided. Always starts at 1
+				while(!endFound){
+					//Get the remainder after the division
+					int remainder = numerator % denominator;
+					//Check if the remainder is 0 and set the flag
+					if(remainder == 0){
+						endFound = true;
+					}
+					//Check if the remainder is in the list and set the appropriate flags
+					else if(denomList.Contains(remainder)){
+						endFound = true;
+						cycleFound = true;
+					}
+					//Else add it to the list
+					else{
+						denomList.Add(remainder);
+					}
+					//Multiply the remainder by 10 to continue finding the next remainder
+					numerator = remainder * 10;
+				}
+				//If a cycle was found check the size of the list against the largest cycle
+				if(cycleFound){
+					//If it is larger than the largest, set it as the new largest
+					if(denomList.Count > longestCycle){
+						longestCycle = denomList.Count;
+						longestNumber = denominator;
+					}
+				}
+			}
+
+			//Stop the timer
+			timer.Stop();
+
+			//Throw a flag to show the problem is solved
+			solved = true;
+		}
+		//Reset the problem so it can be run again
+		public override void Reset(){
+			base.Reset();
+			longestCycle = 0;
+			longestNumber = 1;
+		}
+	}
+}
+
+/* Results:
+The longest cycle is 982 digits long
+It started with the number 983
+It took an average of 4.657 milliseconds to run this problem through 100 iterations
+*/