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question on if loop

JayaSiji Gopal
Ranch Hand

Joined: Sep 27, 2004
Posts: 303
class test {

static boolean check;

public static void main(String args[]) {

int i;

if(check == true)




if(i=2) i=i+2;

else i = i + 4;




The program does not compile because of the statement if(i=2)

i answered 4,but the correct ans is the last option.

i have come across eg, where there is a variable assignment in the if loop. one of the major questions which r a little tricky.
in this eg, also, the variable is assigned 2 which now returns true and hence i answered 4.

anybody plz explain?

SCJP 1.4, SCWCD 1.4<br /> <br />Thanks in advance!<br />Jayashree.
Junilu Lacar

Joined: Feb 26, 2001
Posts: 6521

The operator should be "==" not "=". The former tests for equality of two values, the latter is the assignment operator.

Junilu - [How to Ask Questions] [How to Answer Questions]
navneet shrivastava
Ranch Hand

Joined: Jul 09, 2004
Posts: 39
"if()" must evaluate to a boolean value;
simplifying: the statement/condition within '(condition)' must evaluate to boolean.

Joe Borderi
Ranch Hand

Joined: Oct 23, 2004
Posts: 151
"i have come across eg, where there is a variable assignment in the if loop."

A variable assignment will work in a loop or if condition if the variable assingments evaluate to a boolean:
I agree. Here's the link:
subject: question on if loop
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