Completed the exercises

csharp-fundamentals-loops.Main/Core.cs

@@ -19,33 +19,59 @@ public class Core
 
         public void stepOne()
         {
-            // TODO: 1. Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array                        
-            throw new NotImplementedException();            
+            // TODO: 1. Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array
+            for(int i = 0; i < numsZeroToThree.Length; i++)
+            {
+                numsZeroToThree[i] = i;
+            }     
         }
 
         public void stepTwo()
         {
             // TODO: 2. Write a for loop that adds the numbers 5 to 10 to the numsFiveToTen array
-            throw new NotImplementedException();
+            int num = 5;
+            for(int i = 0; i < numsFiveToTen.Length; i++)
+            {
+                numsFiveToTen[i] = num;
+                num++;
+            }
         }
 
         public void stepThree()
         {
             // TODO: 3. Write a for loop that adds the numbers 3 to 0 (in that order) to the countdown array
-            throw new NotImplementedException();
-
+            int num = 3;
+            for(int i = 0; i < countdown.Length; i++)
+            {
+                countdown[i] = num;
+                num--;
+            }
         }
 
         public bool stepFour(int num)
         {
             // TODO: 6. Write a for loop that checks if num is in the favouriteNumbers array            
-            throw new NotImplementedException();
+            for (int i = 0; i < favouriteNumbers.Length; i++)
+            {
+                if (favouriteNumbers[i] == num)
+                {
+                    return true;
+                }
+            }
+            return false;
         }
 
         public bool stepFive(string hobby)
         {
             // TODO 5. Write a for loop that checks if the hobby String is in the myHobbies array
-            throw new NotImplementedException();
+            for(int i = 0; i < myHobbies.Length; i++)
+            {
+                if (myHobbies[i] == hobby)
+                {
+                    return true;
+                }
+            }
+            return false;
         }
     }