Write a function that takes one double parameter, and returns a char. The parameter represents a grade, and the char represents the corresponding letter grade. If you pass in 90, the char returned...

Write a function that takes one double parameter, and returns a char.  The parameter represents a grade, and the char represents the corresponding letter grade.  If you pass in 90, the char returned will be ‘A’.  If you pass in 58.67, the char returned will be an ‘F’ etc.  Use the grading scheme on the syllabus for this course to decide what letter to return.