Thread: while loop

I'm trying to get my while loop to include negative numbers except -9999.
I could get my code to read positive numbers like 5 having a sum of odd numbers of 9, but trying to get negative numbers never worked such as this:

System.out.println("Enter a number: ");
		int num = input.nextInt();
 
		int sum = 0;
 
		while (num > 0) {
			sum += num;
			num = num - 2;
		}
		System.out.println(sum);

This code works for positive numbers, but not negative. I couldn't get it to work for negative numbers, as it would give me like -2362970237907 or something similar.

I've tried several different ways including getting an output of really high negative numbers when entering -5.

This is the best I could do with the code although it doesn't give me an output for some reason when i enter a number like 5. Why isn't it?

Here's my code:

System.out.println("Enter a number: ");
			int num = input.nextInt();
 
			int sum = 0;
 
				while (num >= 0 || num < 0) {
					if (num >= 0) {
						sum += num;
						num = num - 2;	
					}
					else {
						sum += num;
						num = num + 2;
					}
 
				}
			System.out.println(sum);