• 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 Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Ron McLeod
  • Paul Clapham
  • Rob Spoor
  • Liutauras Vilda
Sheriffs:
  • Jeanne Boyarsky
  • Junilu Lacar
  • Tim Cooke
Saloon Keepers:
  • Tim Holloway
  • Piet Souris
  • Stephan van Hulst
  • Tim Moores
  • Carey Brown
Bartenders:
  • Frits Walraven
  • Himai Minh

Boolean Question

 
Greenhorn
Posts: 3
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi all,
I'm a long time lurker here, gleening information about the Programmer certification and anything else that I've had a problem with. But this would be my first official post.
I ran accross this question in Suns ePractice test section and I'm having a hard time with one of the steps;
} class Bool {
static boolean b;
3. public static void main(String [] args) {
4. int x=0;
5. if (b ) {
6. x=1;
7. }
8. else if (b = false) {
9. x=2;
10. }
11. else if (b) {
12. x=3;
13. }
14. else {
15. x=4;
16. }
17. System.out.println("x = " + x);
18. }
19. }
The anxswer is x = 4
I cant see where the code fails to the else. I know b was initially defaulted to False and at line 8 it was rei-initialized to False. But I cnat determine how it falls to the else statement and sets x = 4.
Any help?
BTW, thanks for the great pointers over the last several months everyone. Im talking the test Jan 12th and you've all been a great help!
 
Dave Fishburn
Greenhorn
Posts: 3
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Nevermind.
I see it now. b was set to false and by default fell out of the if statement.
 
Ranch Hand
Posts: 3178
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Originally posted by Dave Fishburn:
Nevermind.
I see it now. b was set to false and by default fell out of the if statement.


Welcome to the Ranch!!!
It's good that u could find out the solution by urself....
In the case of b = false, b is assigned to be false and the condition got wrong. So it jumped down to the next condition and the thing happens in the last condition...
Hope to see u wondering around the ranch for long....
 
Ranch Hand
Posts: 341
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

In line 2 default boolean b is false,
line 6 is not accessed,
line 8 b is assigned to false,
line 9 and 12 is not accessed,
the last else in line 14 sees b is true,and therefore x = 4.
 
Don't get me started about those stupid light bulbs.
reply
    Bookmark Topic Watch Topic
  • New Topic