Finishing up project, and adding in comments

cs-115-project/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

cs-115-project/src/Main.java

@@ -1,5 +1,67 @@
+/**
+ * This program lets the user enter up to 10 grades.
+ * It also provides:
+ * - Average Grade
+ * - Count of grades
+ * - Grade letter equivalent
+*/
+import java.util.ArrayList;
+import java.util.Scanner;
+
 public class Main {
     public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        int userInput;
+        ArrayList<Integer> grades = new ArrayList<>();
+        int sum = 0;
 
+        // Loop the user input until 10
+        for (int i = 0; i < 10; i++) {
+            System.out.print("Please enter your grade: ");
+            userInput = scanner.nextInt();
+
+            // If '999' is detected it will end the program
+            if (userInput == 999) {
+                break;
+            }
+
+            // Add the user input to a sum
+            sum += userInput;
+
+            // Add the user input grade to the grades ArrayList
+            grades.add(userInput);
+        }
+
+        System.out.println();
+
+        System.out.println("Average Grade: " + sum / grades.size());
+        System.out.println("Amount of Grades: " + grades.size());
+
+        System.out.print("Grade List: ");
+        for (int grade:grades) {
+            System.out.print(grade + ", ");
+        }
+
+        System.out.println();
+
+        System.out.print("Converted To Grade Letter: ");
+        for (int grade:grades) {
+            System.out.print(calculateGrade(grade) + ", ");
+        }
+    }
+
+    // This method calculates and returns a letter grade based on the passed in score.
+    private static char calculateGrade(int grade) {
+        if (grade >= 90 && grade <= 100) {
+            return 'A';
+        } else if (grade >= 80 && grade <= 89) {
+            return 'B';
+        } else if (grade >= 70 && grade <= 79) {
+            return 'C';
+        } else if (grade >= 60 && grade <= 69) {
+            return 'D';
+        } else {
+            return 'F';
+        }
     }
 }