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

'if'block ??

 
Ranch Hand
Posts: 435
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
What will the following program print?

I tried running the program, it printed "false false"
I cannot understand the if/else block i.e
if( b )
{
x = ( ch == ia[ch]);
}
else x = ( ba[ch] = b );
Can any one explain me??
Sonir
 
Ranch Hand
Posts: 287
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
The boolean b is automatically intialized to false. The char ch is automatically initialized to \u0000 which is 0 (Remember you can use Unicode anywhere in your code) so the if statement reads like this if (false) // skips the if section and goes to the else block. The assignment else x = ( ba[ch] = b ); will break down like this
else x = ( ba[ch] = b ); //original
else x = (ba[0] = false); // first op
else x = (false); 2nd op
So the sys print will print
System.out.println(false" "+false);
 
Ranch Hand
Posts: 44
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
member variables will be given default value if they're not initiated. so
b=false
ia=0
ch='\u0000'
ba=false
so in if block, as b is false, it'll go to else statement. b(false) is first assigned to ba, then x. so both x and ba[ch] are false
 
This parrot is no more. It has ceased to be. Now it's a tiny ad:
the value of filler advertising in 2020
https://coderanch.com/t/730886/filler-advertising
    Bookmark Topic Watch Topic
  • New Topic