Gradebook Manager

First programming assignment for Programming II (FIU). A command-line Java program for managing student grades — users enter student records (name, PID, grade) with full input validation, then run commands to query stats and update grades.

Features

• Interactive student entry with validation (names, 7-digit PID, grade 0–100)
• Automatic letter-grade conversion (A through F)
• Commands: min/max/average/median score|letter, letter <PID>, name <PID>, change <PID> <newGrade>, tab scores, tab letters, quit

Structure

• Grade — score + letter grade, kept in sync
• Student — name, PID, and Grade
• GradeBook — list of students, lookup and stats
• InputValidation — input parsing/validation
• Main — reads input and dispatches commands

Built in Java using Scanner for console I/O, no external dependencies.