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Why should we use return statement when using a recursive call?


By : Annie
Date : September 16 2020, 03:00 AM
wish help you to fix your issue While its return value is of type int, the function must return a value. Every place where it returns must return a value. When the recursive call made by the current function invocation returns, it gives you the answer; you must return that answer to the calling context — either the next level up the recursion chain or the original caller.
If you don't return a value, you invoke undefined behaviour, which is A Bad Thing!™
code :


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Recursive method to return value only from the last recursive call


By : user2121295
Date : March 29 2020, 07:55 AM
like below fixes the issue You must return ProcessStream(stream.NextPosition) at the end of your function.
code :
public string ProcessStream(int streamPosition)
{
    var stream = GetStream(streamPosition);

    if (stream.Items.count == 0)
        return stream.NextPosition;

    foreach(var item in stream.Items) {
        ProcessItem(item);
    }

    return ProcessStream(stream.NextPosition)
}

Recursive function that return result from 'if' statement instead of 'else' statement


By : Julián Aloise
Date : March 29 2020, 07:55 AM
wish of those help I'm pretty new in Python and I'm trying to write a simple recursive function: , Wow wow, how tortured this is.
code :
def bugged_recursion(inp_value, list_index=0):
    # i don't get why you compare list_index here
    if list_index == 0:
        # you'll get an IndexError if list_index > len(inp_value)
        if inp_value[list_index] == 'valid':
            status = 'valid inp_value'
        else:
            status = 'invalid inp'
            # there is only one place where you increment list_index
            # i suppose there is something wrong here
            list_index +=1
            # you forgot to return here
            return bugged_recursion(inp_value, list_index=list_index)
    else:
        if inp_value[list_index] == 'valid':
            status = 'index {} is a valid inp_value'.format(list_index)
        else:
            status = 'index is never a valid inp_value'
    return (inp_value,status)
def no_recursion(inp_value):
    for i, val in enumerate(inp_value):
        # you probably have a good reason to test the index
        if i == 0:
            if val == 'valid':
                yield 'valid inp_value: %s' % val
            else:
                yield 'invalid inp: %s' % val
        else:
            yield 'index %s is %s valid inp_value' % (
                i,
                'a' if val == 'valid' else 'never'
            )

print tuple(no_recursion(inp_value))

Recursive program reaches return statement, but jumps back to call in method


By : JackOfAllGames
Date : March 29 2020, 07:55 AM
Hope this helps Calling the recursive method doesn't terminate your method - you missed the return there. Once you've done that, as @pjs mentioned in the comments, you really have no need for a while loop - you just need a simple conditional statement:
code :
public static double randomRecursion(double a, double b, int i) {
    if (i > 0) { 
        b = ((1 / a) - a) * b;
        i = i - 1;
        // return was missing here
        return RandomRecursion(a, b, i);
    }
    return b;
}

Recursive function landing in an infinite loop. Control will get back to funciton call even after return statement evalu


By : Elena Kirshanova
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I am giving up on using recursive function, i came up with a solution using while loop
code :
 var LLeafParent = GetLastLeafLeft(ParentId);
                while (LLeafParent != null) // To return last node of tree which has null left child
                {
                    var res = GetLastLeafLeft(LLeafParent);
                    if (res == null)
                        break;
                    LLeafParent = res; // returns ID when it has a left node null
                }
public string GetLastLeafLeft(string Id)
    {
        var leftchildId = dbcontext.NMTrees.Where(ll => ll.UserID == Id).Select(tt => tt.LeftChildID).FirstOrDefault();
        return leftchildId;
    }

If my recursive method return true, why it enters a recursive call?


By : user3332385
Date : March 29 2020, 07:55 AM
this will help Could it be that you are not using the value returned? eg in this part:
code :
if(x > arr[position][arr[position].length - 1]){
    exerciseSix(arr, x, ++position);
}
return false;
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