It should be true.........

[sonir shah]

What is the result of executing the following fragment of code:
boolean b1 = false;
boolean b2 = false;
if (b2 = b1 != b2)
{
System.out.println("true");
} else
{
System.out.println("false");
}
Answer : it will print "false"
I think it should print "true"
because first the expression b1!=b2 will return false (as b1 and b2 actually contain "false")
and now this "false" is compared with b2(which is also "false")
Hence when b2(false) = false is compared it is true,
So, it should print "true"...
Am I right??
Val Your Comments..??

[chi Lin]

Originally posted by sonir shah:
What is the result of executing the following fragment of code:
boolean b1 = false;
boolean b2 = false;
if (b2 = b1 != b2)
{
System.out.println("true");
} else
{
System.out.println("false");
}
Answer : it will print "false"
I think it should print "true"
because first the expression b1!=b2 will return false (as b1 and b2 actually contain "false")
and now this "false" is compared with b2(which is also "false")
Hence when b2(false) = false is compared it is true,
So, it should print "true"...
Am I right??
Val Your Comments..??

The problem is "when b2(false) = false is compared it is true,"
b2 = false is a assignment, not a comparsion, overall result is false then.

[sai jai]

Originally posted by chichih Lin:


The problem is "when b2(false) = false is compared it is true,"
b2 = false is a assignment, not a comparsion, overall result is false then.

hi lin
i want a clarification the stat
if (b=b1!=b2){
------
}
irrespective of values of b,b1,b2
final thing in 'if' is assignment b=false / b=true
the assignment operation is a success so it is true (my guess).
so the o/p must be true,so whats actually happening ?
can u pull me out from my doubt.
---sai

[sai jai]

Originally posted by chichih Lin:


The problem is "when b2(false) = false is compared it is true,"
b2 = false is a assignment, not a comparsion, overall result is false then.

hi lin
i want a clarification the stat
if (b=b1!=b2){
------
}
irrespective of values of b,b1,b2
final thing in 'if' is assignment b=false / b=true
the assignment operation is a success so it is true (my guess).
so the o/p must be true,so whats actually happening ?
can u pull me out from my doubt.
---sai

[Roy Ben Ami]

the statement is:
if (b2 = b1 != b2)
notice the first = is assigment the second is != which is comparison operator.
assigment get done last by the compiler so first he computes the comparison.
b1 is false and b2 is false so b1 != b2 returns false (because they r equal).
now we have the assignmment :
b2= false
so now b2 equals false and thats also the result of the if so we have if(false)
that goes to the else block and prints false.