Enter a string and print it backwards

Question

Shuoze Xu 2022-7-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1753520-enter-a-string-and-print-it-backwards

评论： KSSV 2022-7-5

Hi.

I'm having a problem with how do I print the string backwards.

Here is my code.

string = input("Please enter a phase: ",'s');

converted_string = []; % Empty phase

for i = length(string):1 % from end to begin

converted_string = [converted_string,string(i)];

end

fprintf("%s converts to %s",string,converted_string);

Expected result: Please enter a phase: There are 18 apples

'There are 18 apples' converts to 'selppa 81 era erehT'

My code result: Please enter a phase: There are 18 apples

There are 18 apples converts to

The first question is that how to add symbol ' on the string?

The second question is that why the result did not have reverse string here?

Thank you all.

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KSSV 2022-7-5

在 MATLAB Online 中打开

str = 'MATLAB' ;
s = [] ;
n = length(str) ;
for i = n:-1:1
    s = [s str(i)];
end
s
s = 'BALTAM'

Shuoze Xu 2022-7-5

For q1, is that means i need to add ' on the fprintf like that '%s'?

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Answer 1

KSSV 2022-7-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1753520-enter-a-string-and-print-it-backwards#answer_1000150

在 MATLAB Online 中打开

str = 'MATLAB' ;
% Option 1 
flip(str)
ans = 'BALTAM'
% option 2 
str(end:-1:1)
ans = 'BALTAM'

For printing, you can use fprintf

fprintf('%s\n',str)
MATLAB

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Shuoze Xu 2022-7-5

编辑：Shuoze Xu 2022-7-5

在 MATLAB Online 中打开

If i want to use for loop, should i do like that?

string = input("Please enter a phase: ",'s');
old_char = char(string);
new_char = [];
for i = 1:length(old_char)
    new_char = [new_char,old_char(end-i+1)];
end
fprintf("'%s' converts to '%s'",string,new_char);

This is something I learned from a post where I was confused about why char() was needed.

KSSV 2022-7-5

在 MATLAB Online 中打开

You may skip that conversion.

old_char = input("Please enter a phase: ",'s');
new_char = [];
for i = 1:length(old_char)
    new_char = [new_char,old_char(end-i+1)];
end
fprintf("'%s' converts to '%s'\n",old_char,new_char);