Expression in primtives

[Raj Puri]

What does 7 + 8 + " " evaluates. To me it is 78, but I see some questions at the ned of Chapter 3 of Kathy & Bates book giving answer like 15. Do not have book in front of me but that is what I read ... what is the right answer?

[La Vish]

7+8+" " evaluates to 15 ;first the two numbers are added and then added to the empty string;
""+7+8 evaluates to 78 ;here because the empty string is at the begining the following 7 and 8 are treated as just string additions.
7+""+8 evaluates to 7 8; same as above but note the space between 7 and 8.

[piy varsh]

Hi,
I've tried the same example but I got bit different results
1.15
2.78
3.78
in second and third expression answers are same there was no space in between.
could anyone please explain

[piy varsh]

Hi,
I think I mistaken the problem earlier I've not given the space in quotes.
now it is working fine. and got the same results
1.15
2.78
3.7 8
thanks

[Francis Siu]

hi Rajesh
What does 7 + 8 + " " evaluates. To me it is 78, but I see some questions at the ned of Chapter 3 of Kathy & Bates book giving answer like 15. Do not have book in front of me but that is what I read ... what is the right answer?
It depends on different situation
If the case is string such as
String cardinality="7"+"5";
and
System.out.println("cardinality"+7+5);
//Above is 75
Differ to the case
//Following is 12
System.out.println("sample operation"+(7+5));
and
int adding=7+5;
Are you sure the book in the first case?