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ComputerScience115/GradeCalculatorProject.java

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+
+/**
+ * CS115
+ */
+import java.util.Scanner;
+
+public class GradeCalculatorProject {
+
+  /* Print specifications – method separate from main */
+  public static void main(String[] args) {
+
+    final int MAX_GRADES = 10; // the max arrau length
+    final int QUIT = 999; // to quit
+    int[] grades = new int[MAX_GRADES]; // array of grades
+    int count = 0; // how many grades the user entered
+    int total = 0; // calculate the total of grades
+
+    printSpecifications(); // specifications
+    Scanner sc = new Scanner(System.in);
+
+    /* Main input loop – stop either on 999 or after 10 grades */
+    System.out.print("Enter quiz grade (or 999 to finish): ");
+    while (count < MAX_GRADES) {
+      int grade = sc.nextInt();
+
+      /* Stop if user typed 999 */
+      if (grade == QUIT) {
+        System.out.println("...Quitting…");
+        break;
+      }
+
+      if (grade < 0 || grade > 100) {
+        System.out.println("Invalid grade – must be 0‑100.  Try again.");
+        continue; // don't count this iteration
+      }
+
+      grades[count] = grade; // store the grade
+      total += grade; // addition while looping
+      count++; // increment number of grades as long as they dont exceed 10.
+
+      System.out.print("Enter next quiz grade (or 999 to finish): ");
+    }
+
+    sc.close();
+
+    /* Print all grades entered */
+    System.out.println("\n=== All Grades Entered ===");
+    for (int i = 0; i < count; i++) {
+      System.out.println("Grade #" + (i + 1) + " : " + grades[i]);
+      System.out.println("");
+    }
+
+    /* Compute average */
+    double average = 0.0;
+    if (count > 0) {
+      average = (double) total / count; // we cast the total since the total is an int
+    }
+    System.out.printf("\nAverage of %d grades is: %.2f%n", count, average);
+    char letterGrade = determineLetterGrade(average);
+    System.out.println("Letter grade: " + letterGrade);
+    System.out.println("=====  End  =====");
+  }
+
+  private static void printSpecifications() {
+    System.out.println("\n===== Quiz Grade Calculator =====");
+    System.out.println("This program will take 10 quiz grades from 0‑100,");
+    System.out.println("Once all the ten inputs are entered, your grades will be printed,");
+    System.out.println("and the program will compute your  average score and letter grade.");
+    System.out.println("If you wish to QUIT the program please type 999.\n");
+    System.out.println("");
+  }
+
+  private static char determineLetterGrade(double average) {
+    // pretty self exlainatory:qw!
+    if (average >= 90)
+      return 'A';
+    if (average >= 80)
+      return 'B';
+    if (average >= 70)
+      return 'C';
+    if (average >= 60)
+      return 'D';
+    return 'F';
+  }
+}