Weekly Challenges Week mvdoyle#5

Author: ClarenceGWhite

ChallengesWithTestsMark8.Tests/bin/Debug/net6.0/ChallengesWithTestsMark8.dll

@@ -7,37 +7,117 @@ public class ChallengesSet05
     {
         public int GetNextNumberDivisibleByN(int startNumber, int n)
         {
-            throw new NotImplementedException();
+            return ((startNumber / n) + 1) * n;
         }
 
         public void ChangeNamesOfBusinessesWithNoRevenueTo_CLOSED(Business[] businesses)
         {
-            throw new NotImplementedException();
+            foreach (Business business in businesses)
+            {
+                if (business.TotalRevenue <= 0)
+                {
+                    business.Name = "CLOSED";
+                }
+            }
         }
 
         public bool IsAscendingOrder(int[] numbers)
         {
-            throw new NotImplementedException();
+            if (numbers == null || numbers.Length == 0) return false;
+            int prevNumber = numbers[0];
+            for (int i = 1; i < numbers.Length; i++)
+            {
+                if (numbers[i] < prevNumber)
+                {
+                    return false;
+                }
+                prevNumber = numbers[i];
+            }
+            return true;
         }
 
         public int SumElementsThatFollowAnEven(int[] numbers)
         {
-            throw new NotImplementedException();
+
+            if (numbers == null) return 0;
+            int sum = 0;
+            for (int i = 0; i < numbers.Length; i++)
+            {
+                if (numbers[i] % 2 == 0)
+                {
+                    try { sum += numbers[i + 1]; }
+                    catch (System.IndexOutOfRangeException)
+                    {
+                        // no number to add to sum value
+                    }
+                }
+            }
+            return sum;
+
         }
 
         public string TurnWordsIntoSentence(string[] words)
         {
-            throw new NotImplementedException();
+
+            if (words == null || words.Length == 0 || words.Length == 1)
+            {
+                return "";
+            }
+            string sentence = "";
+            int counter = 0;
+            foreach (string str in words)
+            {
+                if (str == " " || str == "")
+                {
+                    counter++;
+                    continue;
+                }
+
+                string toAdd = str.Replace(" ", "");
+                sentence += toAdd;
+
+                if (counter < words.Length - 1 && toAdd != "") sentence += " ";
+                else if (counter == words.Length - 1) sentence += ".";
+
+                counter++;
+            }
+            return sentence;
+
         }
 
         public double[] GetEveryFourthElement(List<double> elements)
         {
-            throw new NotImplementedException();
+
+            if (elements == null) return new double[0];
+            List<double> everyFourth = new List<double>();
+            for (int i = 1; i <= elements.Count; i++)
+            {
+                if (i % 4 == 0)
+                {
+                    everyFourth.Add(elements[i - 1]);
+                }
+            }
+            return everyFourth.ToArray();
+
         }
 
         public bool TwoDifferentElementsInArrayCanSumToTargetNumber(int[] nums, int targetNumber)
         {
-            throw new NotImplementedException();
+
+            if (nums.Length == 0 || nums.Length == 1) return false;
+            for (int i = 0; i < nums.Length; i++)
+            {
+                for (int j = 0; j < nums.Length; j++)
+                {
+                    if (i == j) continue;
+                    if (nums[i] + nums[j] == targetNumber)
+                    {
+                        return true;
+                    }
+                }
+            }
+            return false;
+
         }
     }
 }