A student grading system program that calculates GPA and letter grades based on user input in preselected fields. It features exception handling for robust performance and the ability to save output to a file.

• Calculate GPA based on user input grades.
• Determine letter grades for each subject.
• Exception handling to ensure smooth operation.
• Save results to a file for future reference.

• Input grades for each subject when prompted.
• GPA and letter grades will be calculated automatically.
• The program handles invalid inputs with appropriate error messages.