Logical operator for strings

Question

Lingbai Ren 2021-9-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1454084-logical-operator-for-strings

评论： Lingbai Ren 2021-9-24

采纳的回答： Image Analyst

在 MATLAB Online 中打开

I am writing the code for rock, paper, and scissors.

I want to ask users' input, if it's rock, paper, or scissors, I want to store the value to user_choice

if the input is anything else, it will just display an error message.

my code is below, does not matter what I put in for the input, it always go through both if and else section, can anyone explain or help to fix it please?

prompt = 'rock(r),paper(p),or scissors(s)? Make a choice!';
user_choice = input(prompt,'s')
if user_choice == 'r'|user_choice =='p'|user_choice =='s'
    fprintf('Your choice is %s/', user_choice);
else
    display('Please select among r, p, or s');
end

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Answer 1

Image Analyst 2021-9-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1454084-logical-operator-for-strings#answer_788319

在 MATLAB Online 中打开

Try it this way:

prompt = 'rock(r),paper(p),or scissors(s)? Make a choice : ';
user_choice = input(prompt, 's');
if ismember(user_choice, {'r', 'p', 's'})
    fprintf('Your choice is %s.\n', user_choice);
else
    warningMessage = sprintf('You entered %s.\nPlease select among r, p, or s ONLY!', user_choice);
	fprintf('%s\n', warningMessage);
    uiwait(warndlg(warningMessage));
end