Added class and test method for Question Marks code challenge.

Author: quickm

Coderbyte_CSharp/1 Easy Challenges/EasyChallenges.txt

@@ -16,7 +16,7 @@ Other Products		02/22/2021		MathProduct
 Palindrome          02/10/2021      PalindromeChecker
 Power of 2			02/22/2021		ExponentTwo
 Product Digits		02/22/2021		MathProduct
-Question Marks
+Question Marks      02/24/2021      QuestionMarkSum
 Remove Brackets
 Simple Adding
 Simple Symbols

Coderbyte_CSharp/1 Easy Challenges/QuestionMarkSum.cs

@@ -0,0 +1,115 @@
+using System;
+
+namespace Coderbyte_CSharp.Easy_Challenges
+{
+    class QuestionMarkSum
+    {
+        // Have the function QuestionsMarks(str) take the str string parameter, which 
+        // will contain single digit numbers, letters, and question marks, and check 
+        // if there are exactly 3 question marks between every pair of two numbers 
+        // that add up to 10. If so, then your program should return the string true, 
+        // otherwise it should return the string false.If there aren't any two numbers 
+        // that add up to 10 in the string, then your program should return false as well.
+
+        // For example : if str is "arrb6???4xxbl5???eee5" then your program should return 
+        // true because there are exactly 3 question marks between 6 and 4, and 3 question 
+        // marks between 5 and 5 at the end of the string.
+        public string QuestionsMarks(string str)
+        {
+            string result    = String.Empty;
+            bool   pass      = false;
+            int    firstPos  = -1;
+            int    secondPos = -1;
+            int    index     = 0;
+
+            while (index < str.Length)
+            {
+                if (FindNumbersInString(str, index, out firstPos, out secondPos))
+                {
+
+                    int first  = (int)Char.GetNumericValue(str[firstPos]);
+                    int second = (int)Char.GetNumericValue(str[secondPos]);
+
+
+                    // 2 integers must equal 10
+                    if ((first + second) == 10)
+                    {
+                        // There must be exactly 3 question marks between 2 integers
+                        pass = IsQuestionMarksExist(str, firstPos, secondPos);
+                    }
+
+                    index = secondPos + 1;
+                }
+
+                // No numbers found in string
+                else
+                {
+                    pass = false;
+                    break;
+                }
+            }
+
+            result = pass ? "true" : "false";
+
+            return result;
+        }
+
+        protected bool FindNumbersInString(string str, int start, out int first, out int second)
+        {
+            bool    result = false;
+                    first = -1;
+                    second = -1;
+
+            if (start == str.Length - 1)
+            {
+                return false;
+            }
+
+            for (int index = start; index < str.Length; index++)
+            {
+                if (Char.IsDigit(str[index]))
+                {
+                    if (first == -1)
+                    {
+                        first = index;
+                    }
+
+                    else
+                    {
+                        second = index;
+                        break;
+                    }
+                }
+            }
+
+            result = (first != -1 && second != -1);
+
+            return result;
+        }
+
+        protected  bool IsQuestionMarksExist(string str, int start, int end)
+        {
+            bool result = false;
+
+            int num1  = start + 1;
+            int num2  = end;
+            int count = 0;
+
+            if (num2 - num1 >= 3)
+            {
+                for (int index = num1; index < num2; index++)
+                {
+                    if (str[index] == '?')
+                    {
+                        count++;
+                    }
+                }
+
+                result = (count == 3);
+            }
+
+
+            return result;
+        }
+    }
+}

Coderbyte_CSharp/Coderbyte_CSharp.csproj

@@ -52,6 +52,7 @@
     <Compile Include="1 Easy Challenges\MedianMovement.cs" />
     <Compile Include="1 Easy Challenges\NumberCheck.cs" />
     <Compile Include="1 Easy Challenges\PalindromeChecker.cs" />
+    <Compile Include="1 Easy Challenges\QuestionMarkSum.cs" />
     <Compile Include="1 Easy Challenges\SquareVowels.cs" />
     <Compile Include="1 Easy Challenges\StringIntersection.cs" />
     <Compile Include="1 Easy Challenges\StringReverse.cs" />

Coderbyte_CSharp/Program.cs

@@ -30,6 +30,7 @@ static void Main(string[] args)
             tc.Test_VowelSquare();
             tc.Test_LongestWord();
             tc.Test_MovingMedian();
+            tc.Test_QuestionsMarks();
 
             // Medium
             Console.WriteLine("Medium Code Challenges:");

Coderbyte_CSharp/TestChallenge.cs

@@ -312,6 +312,25 @@ public void Test_MovingMedian()
 
         }
 
+        public void Test_QuestionsMarks()
+        {
+            QuestionMarkSum  sum = new QuestionMarkSum();
+
+            string str = "arrb6???4xxbl5???eee5";
+            Console.WriteLine("Question Marks:");
+            Console.WriteLine("Input: {0}", str);
+            Console.WriteLine("Output:  {0}", sum.QuestionsMarks(str));
+            Console.WriteLine();
+
+            str = "arrb6??4xxbl5???eee8";
+            Console.WriteLine("Question Marks:");
+            Console.WriteLine("Input: {0}", str);
+            Console.WriteLine("Output:  {0}", sum.QuestionsMarks(str));
+            Console.WriteLine();
+
+
+        }
+
 
         #endregion