This is Matlab using the loop function The local Drivers Lic

This is Matlab, using the loop function

The local Driver\'s License Office has asked you to write a

program that grades the written portion of the driver\'s license

exam. The exam has 20 multiple-choice questions. Here are the

correct answers:

1.B         6.A         11.B       16.C

2.D         7.B         12.C       17.C

3.A         8.A         13.D      18.B

4.A         9.C         14.A       19.D

5.C         10.D      15.D      20.A

Your program should store the correct answers shown above in an

array. It should ask the user to enter the student\'s answers for

each of the 20 questions, and the answers should be stored in

another array. After the student\'s answers have been entered, the

program should display a message indicating whether the student

passed or failed the exam. (A student must correctly answer 15 of

the 20 questions to pass the exam.)

It should then display the total number of correctly answered

questions, the total number of incorrectly answered questions,

and a list showing the question numbers of the incorrectly

answered questions.

Input Validation: Only accept the letters A, B, C, or D as

answers.

IMPORTANT: Your program must display informative messages

for both input inquiry and output display.

Solution

% matlab code

correctAnswers = [\'B\',\'D\',\'A\',\'A\',\'C\',\'A\',\'B\',\'A\',\'C\',\'D\',\'B\',\'C\',\'D\',\'A\',\'D\',\'C\',\'C\',\'B\',\'D\',\'A\'];
booleanAnswer = [];
correct = 0;
answer = \'\';
for i=1:length(correctAnswers)
    while true
        fprintf(\"Enter answer for question %d: \",(i+1));
        answer = input(\" \",\'s\');
        if ((strcmp(answer,\'A\') == 0 | strcmp(answer,\'B\')==0 | strcmp(answer,\'C\')==0 | strcmp(answer,\'D\')==0 )
            break
        else
            disp(\"Invalid Input\ \");
        end
    end
    if strcmp(correctAnswers(i),answer) == 1
       correct = crrect + 1;
       booleanAnswer(i) = 1;
    else
       booleanAnswer(i) = 0;
    end
end

fprintf(\"Total correct answers: %d\ \",correct);
if correct >= 15
   disp(\"Student passed\");
else
   disp(\"Student Failed\");
end

disp(\"Incorrectly answered questions: \")
for i=1:length(booleanAnswer)
   if booleanAnswer(i) == 0
       fprintf(\"Question number: %d\ \",(i+1));
   end
end

% end matlab code