C++

Assume you are Professor and you want to automate grading.

Write a program to translate the letter grade to a number.

An example would be to translate an A to 4.

The Letter grades we use at the College level are A, B, C, D, F.

The corresponding numbers are 4, 3, 2, 1, 0

All letter grades could have a + or after them except the letter grade F at the University level.

Therefore, the letter grades are: A, A-, B+, B, B-, C+, C, C-, D+, D, D-, F

A letter grade that has + sign after it, is increased by 0.3 and a letter grade that has - sign after it, it is decreased by 0.3.

Assume that there is not an A+.

Please validate your input

nothing too advanced please we have not learned much