question on if loop

[JayaSiji Gopal]

class test {

static boolean check;

public static void main(String args[]) {

int i;

if(check == true)

i=1;

else

i=2;



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

else i = i + 4;

System.out.println(i);

}

}




3
4
5
6
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?

[Junilu Lacar]

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

[navneet shrivastava]

"if()" must evaluate to a boolean value;
simplifying: the statement/condition within '(condition)' must evaluate to boolean.

[Joe Borderi]

"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:

  
someMethod(){
  boolean b = false;
  if(b=true){
    //this code will execute
  }
 
  b = false;
  while(b=true){
    //without a break statement, throw, uncaught exception, System.exit(),
    //or the like, this will be an infinite loop
  }