Enter a string and print it backwards

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.

[Stephen23]

Q1: single quotes must be escaped by duplicating them: 'this is escaped ''.'

Q2: Consider the order of these: [converted_string,string(i)]; Using your example: after the 1st iteration, converted_string consists of 'T', after the 2nd iteration it consists of 'Th'... Think about that concatenation.

[KSSV]

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

s = 'BALTAM'

[Shuoze Xu]

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

Answer 1

[KSSV]

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

[Shuoze Xu]

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]

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);