How to make a Palindrome Checker

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Krish Desai 2015-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/258975-how-to-make-a-palindrome-checker

评论： Image Analyst 2023-5-1

I need to write a code that checks to see if an input is a palindrome-same backwards as forwards, for instance madam or rotor.

I need to use the "programming method" which means I can't use any functions with str, eval, flip or printf. I don't want the answer, but just a place to start on how to build this code. Note, this isn't homework, just a practice question.

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Image Analyst 2015-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/258975-how-to-make-a-palindrome-checker#answer_202313

在 MATLAB Online 中打开

I get no such problem. Did you pass in rotor or 'rotor'? You probably forgot the quotes around it, because this works fine for me

output = isPalindrome('rotor')

If the function is

function output = isPalindrome(yourString)
lastIndex=floor(length(yourString)/2);
for k=1:lastIndex
  if yourString(k)~=yourString(end+1-k)
    output = false;
  else
    output = true;
  end
end

You also didn't use the debugger like I recommended or else you would have found out that you need to use (end+1-k) instead of (lastIndex+1-k).

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Kashiraj 2023-5-1

can anybody expain palindrom program in detail

Image Analyst 2023-5-1

@Kashiraj it simply compares the first letter to the last letter, the second letter to the next to the last letter, and so on. Just think how you would describe it yourself if you had to explain it to someone.

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Walter Roberson 2015-12-5

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The first point is X(1). The last point is X(end)

The second point is X(2). The second last point is X(end-1)

The third point is X(3). The third last point is X(end-2)

So for the K'th point, which point is the K'th last point?

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Krish Desai 2015-12-5

在 MATLAB Online 中打开

I'm trying the following but when I input isPalindrome(rotor) the error message "Undefined function or variable 'rotor'." pops up.

function output=isPalindrome(yourString)
  lastIndex=floor(length(yourString)/2);
  for k=1:lastIndex
      if yourString(k)~=yourString(lastIndex+1-k)
      output='false';
      else
          output='true';
      end
  end