Operators & Assignments

[Abi Raj]

I have some doubts in Operators & Assignments. pls clarify them

1) Is (--1) a valid expression? If not why.
2) Is (+-+-+-1) a valid expression??
3) what will be the output of the following program

public class Evaluationorder{
public static void main(String[] args) {
int[] array = {4,8,16};
int i = 1;
array[++i] = --i;
System.out.println(array[0]+array[1]+array[2]);
}
}

when I run the program it prints 13. Can somebody explain it??

[Jay Pawar]

public class Evaluationorder{
public static void main(String[] args) {
int[] array = {4,8,16};
int i = 1;
array[++i] = --i; // Line X
System.out.println(array[0]+array[1]+array[2]);
}
}

At Line X
First i gets incremented to 2, we have array[2] = --i; and then i gets decremented by 1 so i = 1. So finally array[2] = 1;

So when you add array[0] = 4 , array[1] = 8 and array[2] = 1 you get output as 13.

Hope that helps you...