how can i write a matlab code to a multple choice question having multiple answers?? say i have to pick out A,B,C,E but excluding D. so far i have this below...

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enoch adotey 2015-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/226375-how-can-i-write-a-matlab-code-to-a-multple-choice-question-having-multiple-answers-say-i-have-to-p

评论： enoch adotey 2015-7-2

采纳的回答： Nick

在 MATLAB Online 中打开

n=[A,B,C,E];

for n=input('Enter your answers:');

switch (n);

       case 'D'; case 'd'; 
            if n=='D'||n=='d'
            disp('wrong answer. Try again please');
            fprintf('Your scored mark is zero(0)\n');
            break;
            end
          if n=='A'||n=='a'&& n=='B'||n=='b'&& n=='C'||n=='c'&& n=='E'||n=='e';
            disp('correct answers,congratulations!');
            break;
          end
     end

end

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Guillaume 2015-7-1

在 MATLAB Online 中打开

Note that

if n=='A'&& n=='B' ... (the rest does not matter)

will never be true. If n is equal to 'A' it is certainly not equal to 'B'. You probably meant to have || everywhere.

enoch adotey 2015-7-2

thank you much for your correction, am looking through to make my changes

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Answer 1

Nick 2015-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/226375-how-can-i-write-a-matlab-code-to-a-multple-choice-question-having-multiple-answers-say-i-have-to-p#answer_184693

编辑：Nick 2015-7-1

在 MATLAB Online 中打开

answer = 'n'
while(answer ~= 'd')
    in = input('Get input: ','s');
    switch lower(in)
        case 'a'
            disp('Right')
            answer = 'a';
        case 'b'        
            disp('Right')
             answer = 'b';
        case 'c'
            disp('Right')
             answer = 'c';
        case 'd'
            disp('Wrong')
             answer = 'd';
        case 'e'
            disp('Right')
             answer = 'e';
        otherwise
            disp('Invalid choice')
             answer = 'na';
    end
end

You can put a function in the correct cases instead of the disp('Right')answer ='a' so it runs the same function if you wanted to as well

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Joseph Cheng 2015-7-1

在 MATLAB Online 中打开

or you can use logical operands as you are hard coding the answers in or use strmatch or strncmp to check strings

posAns = 'abcde';
n=sort(lower(input('Enter your answers:','s')));
Uanswer = zeros(size(posAns));
for ind = 1:numel(posAns)
    Uanswer(ind) = sum(n==posAns(ind));   
end
if sum(Uanswer == [1 1 1 0 1])==5
    disp('correct answer')
else
    disp('wrong')
end
%or other method
if strmatch(n,'abce')
    disp('correct answer')
else
    disp('wrong')
end

enoch adotey 2015-7-2

joseph am grateful you took your time to help me with the exact solution and it has given me a clearer understanding into programming. 2. i still need a clarification to simulate this: if assuming 1000 student took the exam with 30 questions, what will be the number of lucky_students that will have atleast 4 questions correct???

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