Write a program to determine course average, and letter grade of a given a student. Your program must do the following::

• Prompt and read the student's first and last name
• Prompt and read three exam scores
• Calculate the course average and determine the course letter grade . Grading scale is: 90 and above is an A, 80 to 89.99 is a B, 70-79.99 is a C, and below 70 is an F
• Output the full name, the three exam scores, the course average, and the letter grade. You are required to use the printf method to format the output. Each of the required four outputs must be on separate lines.