In C++ (must be able to compile in Visual Studio 2010): Write a program that translates a letter grade into a number grade. Letter grades are A,B,C,D and F, possibly followed by a + 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, and - decreases it by 0.3. However, an A+ has a value of 4.0