Why i am getting index out of bound exception here

[Narasimha (Narasimha Naidu Kommi)]

Coding Blocks IDE

[sanchit.bansal06 (Sanchit Bansal)]

@Narasimha,
https://ide.codingblocks.com/s/224834 corrected code

add a return statement to your base case. And, add an “else” after the if(str.charAt(si)==‘x’) block, that way you will avoid all the unnecessary calls .