Win a copy of Svelte and Sapper in Action this week in the JavaScript forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Ron McLeod
  • Paul Clapham
  • Bear Bibeault
  • Junilu Lacar
Sheriffs:
  • Jeanne Boyarsky
  • Tim Cooke
  • Henry Wong
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • salvin francis
  • Frits Walraven
Bartenders:
  • Scott Selikoff
  • Piet Souris
  • Carey Brown

doubt on char default value...

 
Ranch Hand
Posts: 36
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi,

I am little confused how the "ch" value is being calculated at #2,#3.
When I print the "ch" value at #1, it prints nothing.

My doubt is when i print ba[ch] at#3 it should take as ba[null].Not
sure how it is taking the index value for ch is 0 and printing false.

I know that the default value for char is \u0000 (null character).

Any inputs?? Thanks..

import static java.lang.System.*;
public class TestClass12
{
static boolean b;
static int[] ia = new int[1];
static char ch;
static boolean[] ba = new boolean[1];

public static void main(String args[]) throws Exception
{
out.println(" ch :"+ch);//1
boolean x = false;
if( b )
{
out.println("1");
x = ( ch == ia[ch]);
}
else x = ( ba[ch] = b );//2
System.out.println(x+" "+ba[ch]);//3
}
}
 
Sheriff
Posts: 11343
Mac Safari Java
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Originally posted by Konda Golamaru:
...My doubt is when i print ba[ch] at#3 it should take as ba[null]. Not sure how it is taking the index value for ch is 0 ...


A Java char is really a numeric value that corresponds to a character symbol (see ASCII table). The "null char" has a numeric value of zero. A Java int can obviously have a zero value, but it does not have a "null" value.

An array index is an int. So in the expression ba[ch], ch is converted to type int with a numeric value of zero.
[ June 09, 2007: Message edited by: marc weber ]
 
Konda Golamaru
Ranch Hand
Posts: 36
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Marc,

Thank You. I think I am clear now.

--Konda Golamaru.
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
    Bookmark Topic Watch Topic
  • New Topic