Random selection from a pool of questions

Question

Laiza Perez 2020-12-2

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/674558-random-selection-from-a-pool-of-questions

评论： Setsuna Yuuki. 2020-12-3

Hello, I am having a bit of trouble with my code. The purpose is for it to randomly select a question from a pool of questions and the user inputs the answer. The code works to where a question is randomly selected but once the user inputs an answer, it says its incorrect even when the answer is correct. I think the issue is that the questions are being randomized but the answers that match the question are not. How can I fix this?

QandA={'what is 6x8? ', '48';
       'what is 12x12? ', '144';
       'what is 60/12? ', '5';  
       'what is 5x6? ', '30';
       'what is 8x4? ', '32';
       'what is 7x9? ', '63'; 
       'what is 54/9? ', '6';
       'what is 2x12? ', '24';
       'what is 5x10? ' '50';
       'what is 9x3? ', '27';
       'what is 22/2? ', '11';
       'what is 3x10? ', '30'};
    
qorder = randperm(numel(QandA(:,1)));
QandAreordered = QandA(qorder, :);
for qidx=1:size(QandAreordered, 1)
    answer=input(QandAreordered{qidx, 1}, 's');
    if strcmp([answer ' '], QandAreordered{qidx, 2})
       fprintf('Correct\n', '%s');
    else 
       fprintf('Incorrect\n', '%s'); 
    end
end

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Answer 1

Setsuna Yuuki. 2020-12-2

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/674558-random-selection-from-a-pool-of-questions#answer_563418

编辑：Setsuna Yuuki. 2020-12-2

在 MATLAB Online 中打开

I changed 2 lines and it works

QandA={'what is 6x8? ', '48';
       'what is 12x12? ', '144';
       'what is 60/12? ', '5';  
       'what is 5x6? ', '30';
       'what is 8x4? ', '32';
       'what is 7x9? ', '63'; 
       'what is 54/9? ', '6';
       'what is 2x12? ', '24';
       'what is 5x10? ' '50';
       'what is 9x3? ', '27';
       'what is 22/2? ', '11';
       'what is 3x10? ', '30'};
    
qorder = randperm(numel(QandA(:,1)));
QandAreordered = QandA(qorder, :);
for qidx=1:size(QandAreordered, 1)
    answer=input(QandAreordered{qidx, 1}); %double
    if (answer == str2double(QandAreordered{qidx, 2})) %string to double
       fprintf('Correct\n', '%s');
    else 
       fprintf('Incorrect\n', '%s'); 
    end
end