Thread: Need help understand this while loop.

Hello everyone,

I was reading a book and came across this while loop.

public class Powers {
public static void main (String [] args){
	int e;
	int result;
	for(int i = 0; i < 10; i++){
		result = 1;
		e = i;
	while(e > 0){
		result *= 2;
		e--;
	}
	System.out.println("2 to the " + i + " power is " + result);
		}
	}
}

This loop presents the following (I'm sure it's not necessary):

2 to the 0 power is 1
2 to the 1 power is 2
2 to the 2 power is 4
2 to the 3 power is 8
2 to the 4 power is 16
2 to the 5 power is 32
2 to the 6 power is 64
2 to the 7 power is 128
2 to the 8 power is 256
2 to the 9 power is 512

I am just having a difficult time understand and grasping this concept. My main issue is result *=2; this is making it very difficult to understand. How is result being replace if it only equals to 1.

I don't understand what the problem is. Could you be more specific? Are there some statements that you don't understand.
For example: e--; // Decrements the value in e by 1

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