CMIS 141 Lab 7 do char switch Write a program that inputs characters representing grades and counts the frequency of each grade. Use a char variable for the grade. Switch on it. Have an array of ints for the counters of each grade (A,B,C,D,F). Have a do loop that loops until a sentinel character is input to indicate the end of the user's input. Assuming each class is 3 credits, calculate the GPA. See the GradeCount apple.