Program bypasses while loop with multiple conditions (java)

Question

I have this really simple code:

public class ArrayIO {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);    
        System.out.println("Enter a number from 50 to 150: ");
        int elements = sc.nextInt();

        while(elements<50 && elements>150) {
            System.out.println("Less than 50 or more than 150");
            elements = sc.nextInt();
        }
            sc.close();

            ArrayList<Integer> integers = new ArrayList<>();
            for(int i=1; i<=elements; i++) {
                integers.add(i);
            }

            integers.toArray();

            System.out.printf("Array size is %d\n", integers.size());

    }

}

but my program bypasses the while loop completely when it has more than one condition. It works just fine with only one condition. I feel like I'm doing some really stupid mistake, but I just can't quite get it for almost an hour already.

So... how can elements be less than 50 and greater than 150 at the same time? I think you mean "or", || (Two pipes) — Christopher Schneider
– Christopher Schneider, Commented May 16, 2017 at 18:52
based on System.out.println("Enter a number from 50 to 150: "); you may want : while( elements >= 50 && elements <= 150 ) — SomeDude
– SomeDude, Commented May 16, 2017 at 18:54
@ChristopherSchneider wow, it actually worked. Didn't think I made that stupid of a mistake, quite embarrassing, really. However, I believe I've tried it when I was using if-else statement instead of while loop and it didn't work. It works just fine now, though. Thanks! — Kirill
– Kirill, Commented May 16, 2017 at 18:56
@svasa No, since I want my array size to be >=50 and <=150, and this while loop cuts off every number lower than 50 and higher that 150 — Kirill
– Kirill, Commented May 16, 2017 at 19:07

mmprog · Accepted Answer · 2017-05-16 19:29:30Z

7

Change && to || if you want OR:

while(elements<50 || elements>150) {
    System.out.println("Less than 50 or more than 150");
...

edited May 16, 2017 at 19:29

user7605325

answered May 16, 2017 at 18:55

mmprog

78110 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Program bypasses while loop with multiple conditions (java)

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related