ICSE − Q & A

Guys some of the important programs are:
Prime no,composite no,perfect no,Armstrong no,palindrome no,neon no,duck no,niven no and special no.

what is the default value of boolean ???

any respaper users from chennai?

Anybody worried about theory tomorrow?

I'm so glad. You guys suffer while we literally have NO theory whatsoever. #BlessedLife

Convert snippet using ternary operator:

if (n>m)
  {
    s=n/m;
      m++;}
else 
 { s=m/n;
n++;
}

anyone here with cookery??

Is it compulsory to comment in a program? as said by @NehalG

during photosynthesis the oxygen in glucose comes from?? water or co2

// programme to find whether a string is palindrome or not? 
import java.util.*;
import java.io.*;

public class StringPalindrome
{
    public   void check()
    {Scanner sc=new Scanner(System.in);
    
      String s1;
      System.out.println(" enter a string");
      s1=sc.nextLine();
    
      StringBuffer a1=new StringBuffer(s1);
      StringBuffer a2=new StringBuffer((a1.reverse()));
      
      if(a1.equalsIgnoreCase(a2))
      {
         System.out.println(" the string is a palindrome ");
        }
        else
        {
            System.out.println(" the string is not a palindrome");
        }
    }
    public static void main()
    {
      StringPalindrome a=new StringPalindrome();
      a.check();
    }
}


i am getting this error:

/StringPallindrome.java:16: error: cannot find symbol
      if(a1.equalsIgnoreCase(a2))
             ^
  symbol:   method equalsIgnoreCase(StringBuffer)
  location: variable a1 of type StringBuffer
1 error

please tell what changes should i do in this programme?