Edited Grade Book (used to be in the Address Book program, but I separated them). Finished instructions and solution.

Author: phrdang

out/production/c4t-java/com/codefortomorrow/beginner/chapter9/practice/AddressBook.class

@@ -28,6 +28,10 @@
  * https://stackoverflow.com/questions/473282/how-can-i-pad-an-integer-with-zeros-on-the-left)
  *
  * Sample output: https://youtu.be/ms2tM-llTwo
+ *
+ * Hint: You may encounter a problem when using Scanner.
+ * Read the following article for a solution:
+ * https://www.geeksforgeeks.org/why-is-scanner-skipping-nextline-after-use-of-other-next-functions/
  */
 
 public class AddressBook {

out/production/c4t-java/com/codefortomorrow/beginner/chapter9/solutions/AddressBook.class

@@ -1,11 +1,23 @@
 package com.codefortomorrow.beginner.chapter9.practice;
 
 /*
- * Allow a user to enter the information for an assignment completed by 6 students,
-including first name, last initial, student ID number, points earned, and points possible.
-Then display the information on 6 lines and include the grade as a percent on the assignment.
-
-Alexandria 	R	009988602	50	50	100%
+ * Create a program called GradeBook
+ * which prompts the user to enter
+ * information for 6 students.
+ *
+ * The program should ask the user for
+ * the student's first name (String), last initial (char),
+ * student ID number (long), points earned (int),
+ * and points possible (int).
+ *
+ * It should then print all of that data (see
+ * sample output).
+ *
+ * Sample output: https://youtu.be/2KC8Zy6EIwc
+ *
+ * Hint: You may encounter a problem when using Scanner.
+ * Read the following article for a solution:
+ * https://www.geeksforgeeks.org/why-is-scanner-skipping-nextline-after-use-of-other-next-functions/
  */
 
 public class GradeBook {

out/production/c4t-java/com/codefortomorrow/beginner/chapter9/solutions/GradeBook.class

@@ -26,6 +26,10 @@
  * https://stackoverflow.com/questions/473282/how-can-i-pad-an-integer-with-zeros-on-the-left)
  *
  * Sample output: https://youtu.be/ms2tM-llTwo
+ *
+ * Hint: You may encounter a problem when using Scanner.
+ * Read the following article for a solution:
+ * https://www.geeksforgeeks.org/why-is-scanner-skipping-nextline-after-use-of-other-next-functions/
  */
 
 import java.util.Scanner;

src/com/codefortomorrow/beginner/chapter9/practice/AddressBook.java

@@ -1,15 +1,72 @@
 package com.codefortomorrow.beginner.chapter9.solutions;
 
 /*
- * Allow a user to enter the information for an assignment completed by 6 students,
-including first name, last initial, student ID number, points earned, and points possible.
-Then display the information on 6 lines and include the grade as a percent on the assignment.
-
-Alexandria 	R	009988602	50	50	100%
+ * Create a program called GradeBook
+ * which prompts the user to enter
+ * information for 6 students.
+ *
+ * The program should ask the user for
+ * the student's first name (String), last initial (char),
+ * student ID number (long), points earned (int),
+ * and points possible (int).
+ *
+ * It should then print all of that data (see
+ * sample output).
+ *
+ * Sample output: https://youtu.be/2KC8Zy6EIwc
+ *
+ * Hint: You may encounter a problem when using Scanner.
+ * Read the following article for a solution:
+ * https://www.geeksforgeeks.org/why-is-scanner-skipping-nextline-after-use-of-other-next-functions/
  */
 
+import java.util.Scanner;
+
 public class GradeBook {
 	public static void main(String[] args) {
-		// write code here
+		final int NUMBER_OF_STUDENTS = 6;
+
+		String[] firstName = new String[NUMBER_OF_STUDENTS];
+		char[] lastInitial = new char[NUMBER_OF_STUDENTS];
+		long[] studentIDNumber = new long[NUMBER_OF_STUDENTS];
+		int[] pointsEarned = new int[NUMBER_OF_STUDENTS];
+		int[] pointsPossible = new int[NUMBER_OF_STUDENTS];
+		double[] percent = new double[NUMBER_OF_STUDENTS];
+
+		Scanner input = new Scanner(System.in);
+
+		for (int i = 0; i < NUMBER_OF_STUDENTS; i++) {
+			System.out.println("Student #" + (i + 1));
+
+			System.out.print("Enter first name: ");
+			firstName[i] = input.nextLine();
+
+			System.out.print("Enter last initial: ");
+			lastInitial[i] = input.nextLine().charAt(0);
+
+			System.out.print("Enter student ID number: ");
+			studentIDNumber[i] = input.nextLong();
+
+			System.out.print("Enter points earned: ");
+			pointsEarned[i] = input.nextInt();
+
+			System.out.print("Enter points possible: ");
+			pointsPossible[i] = input.nextInt();
+
+			input.nextLine(); // move cursor to next line
+
+			// calculate percent
+			percent[i] = ((double) pointsEarned[i] / pointsPossible[i]) * 100;
+
+			System.out.println();
+		}
+
+		// display grade book
+		System.out.print("Grade Book\n");
+
+		for (int i = 0; i < NUMBER_OF_STUDENTS; i++) {
+			System.out.printf("%s %s \t %d \t %d / %d \t %.2f%% \n", firstName[i], lastInitial[i],
+					studentIDNumber[i], pointsEarned[i], pointsPossible[i], percent[i]);
+		}
 	}
 }