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Thread: while loop

  1. #1
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    Default 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);


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: while loop

    while (num >= 0 || num < 0) {
    When do you want the loop to stop looping? There are no values of num that will cause the loop to end.

    it doesn't give me an output
    Does the program ever exit or does it run forever?
    If you don't understand my answer, don't ignore it, ask a question.

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