Replace All pi Hint

#1

What is wrong with my code
import java.util.*;
class Main{
public static String pi(String str,int i){
if(str.length()<=1)
return str;
String re=pi(str,i+1);
if(str.charAt(i)==‘p’ && str.charAt(i+1)=‘i’)
{
re=str.substring(0,i)+“3.14”+str.substring(i+1);
}
else
return re;
return str;
}
public static void main(String args[]){
String d=pi(“apidpi”,0);
System.out.println(d);

}}

#2

@Sweta,
String re = pi(str, i + 1); this line will give stackoverflow because there is no base condition on maximum value of i. Hence it will give an infinite recursion and give stack overflow error

#3

ok then if change it like this then again it showing return type is missing

class Main{
public static String pi(String str,int i){
if(str.length()<=1)
return str;
if(i==str.length())
return str;
String re=pi(str,i+1);
if(str.charAt(i)==‘p’ && str.charAt(i+1)=‘i’)
{
re=str.substring(0,i)+“3.14”+str.substring(i+1);
}
else
return re;

}
public static void main(String args[]){
String d=pi(“apidpi”,0);
System.out.println(d);

#4

@Sweta,
If the “if” block is executed, there is no return type. Return type is mentioned only if the “else” block is executed.