String Reversal.... Not working

Code :

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class jack 
{
public static String reverseString(String s, String result,int l)
{
if(l>=0)
{ result=result+s.charAt(l);
reverseString(s,result,l-1);
return result;}
else 
return "error";
 
}
public static void main(String args[])
{
String s="Allen downey";
String result="";
int l=s.length();
String backward=reverseString(s,result,l);
System.out.println(backward);
}
}

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This program should reverse the string
But The program is not yielding output... I know what you are thinking.... why can't I just use while or for... But I can't... I am supposed to be able to write the program without any iteration...
please help...

Quote:

---

class jack
{
public static String reverseString(String s, String result,int l)
{
if(l>=0)
{ result=result+s.charAt(l);
reverseString(s,result,l-1);
return result;}
else
return "error";

}
public static void main(String args[])
{
String s="Allen downey";
String result="";
int l=s.length();
String backward=reverseString(s,result,l);
System.out.println(backward);
}
}

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In the above code certain changes are required

Quote:

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String backward=reverseString(s,result,l);

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Firstly length you are passing should be one less than the actual length because you are directly using length as index value , but here index in a string or array starts from 0 .

Quote:

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String backward=reverseString(s,result,l);

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Code :

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String backward=reverseString(s,result,l-1);

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Secondly little modification in this part , while returning value

Quote:

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if(l>=0)
{ result=result+s.charAt(l);
reverseString(s,result,l-1);
return result;}
else
return "error";

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change required

Code :

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if(l>=0)
{
result=result+s.charAt(l);
return reverseString(s,result,l-1);
}
else
return result;

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OH MY GOD... u are a genius... Thank you so much... I have been trying to figure this out since yesterday... Thank you so very much....

thank you
thank you

Quote:

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OH MY GOD... u are a genius... Thank you so much... I have been trying to figure this out since yesterday... Thank you so very much....

thank you
thank you

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you r welcome , and please mark this thread as solved.