Please tell me why it is saying variable declaration is not allowed here but it is running in the actual compiler

Question

import java.util.*;
public class Program
{
public static void main(String[] args)
{
Scanner in=new Scanner(System.in);
String s,str="";
System.out.println("Enter a string");
s=in.nextLine();
s=s.toLowerCase();
s=s.trim();
int l=s.length();
for(int i=97;i<=122;i++)
{
for(int j=0;j<l;j++)
char c=s.charAt(j); /* It is saying that variable declaration of c is not allowed here, but it is actually running in bluej */
if(c==(char)i)
str=str+(char)i;
}
System.out.println("The string when in alphabetical order: "+str);
}
}

Answer 1

after second for() there are not parentheses, it is same as
for (int j=0; j<l; j++)
{ // implicitly
char c = s.charAt(j);
} // implicitly

if (c==(char)i)
str=str+(char)i;

in next if() It can't resolve c variable, because it is after end of second for() scope

I run it on android and jdoodle web java 17 with same error

Answer 2

zemiak Done ✔✔
https://code.sololearn.com/coRR9tM8nROl/?ref=app
Thnk u soooo muchhhh sir 😊

Answer 3

zemiak thnk u for ur answer I am gonna try using parentheses