Debug of a very simple recursion problem
3 views (last 30 days)
Show older comments
The idea of the problem is to reverse a character array using recursion.
1. Write a function called charReversal with the following function signature:
1 f u n c ti o n a r r a y 2 = c h a r R e v e r s al ( a r r a y 1 )
where array1 is the input character array, and array2 is the reversal of array1. For example, charReversal(’abcde’) should return ’edcba’.
My answer:
function array2 = charReversal(array1)
%arrary1 is the input character array
%arrary2 is the reversal of array1
if numel(array1)<2
array2 = array1;
else
array2 = reverse(array1);
end
Question: I don't know where to to put the base case, what the base case should be.
Thank you very much.
0 Comments
Answers (1)
Walter Roberson
on 21 Oct 2017
if numel(array1)<2
array2 = array1;
is already handling the base case. But the rest of your code needs to be developed to use recursion.
2 Comments
Walter Roberson
on 21 Oct 2017
The function does not call itself, and does not call any function that calls the function, so No, it is not already recursive.
Hint:
What happens if you remove one character and reverse the rest, and then somehow combine the one removed character with what was returned from reversing the rest?
See Also
Categories
Find more on Data Types in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!