Write a program that translates a letter grade into a number grade. Letter grades are A, B, C, D, and F, possibly followed by + or . Their numeric values are 4, 3, 2, 1, and 0. There is no F+ or F. A + increases the numeric value by 0.3, a decreases it by 0.3. However, an A+ has value 4.0.

Compile your program. Be sure to handle any entry that is an invalid grade with an appropriate error message.

Run your program with inputs: A+, B+, C, C-, F+, F-, PASS

Example: Enter a letter grade: C-, The numeric value is 1.7