Java array using a while loop

Question

I have to:

create this java array;
loop through it using a while loop;
terminate the program if the sum adds up to 100;
and print the sum and the numbers that I did put into the array.

I can't figure out how to do that, here is my code so far, any help would be appreciated.

public class december2012 {
    public static void main(String[] args) {  

        int sum=0;            

        Scanner input = new Scanner(System.in);            

        int i=1;

        int [] array = new int[i];

        while( i > array.length || sum <= 100) {

          System.out.println("Write in the " + i + " number") ; 
          array[i]=input.nextInt();
          sum=+array[i];
           System.out.println("sum is " + sum); 

        }            

        }
    }

you mean sum = sum + array[i], note that i is 1 all the time, and so you get an ArrayIndexOutOf BoundException. — Ingo
– Ingo, Commented Oct 20, 2013 at 17:13

Ilya · Accepted Answer · 2013-10-20 17:19:17Z

5

int i = 0;                            // array starts from 0
int [] array = new int[100];          // create larger array
while(i < array.length && sum <= 100) // i should be less then length
                                      // && instead of ||
{
   System.out.println("Write in the " + i + " number") ; 
   array[i] = input.nextInt();
   sum += array[i];                   // += instead of =+
   System.out.println("sum is " + sum);
   i++;                               // increment i 
}

Ideone DEMO

edited Oct 20, 2013 at 17:19

answered Oct 20, 2013 at 17:13

Ilya

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Comments

Birb · Accepted Answer · 2013-10-20 17:12:34Z

First of all, when setting

int i=1;
int [] array = new int[i];

you are creating an array with 1 slot, which index is 0. This is crucial to take note of, when you're doing this:

array[i]=input.nextInt();

because, as you defined it, i is not 1, which means that your assign the 2nd index, index 1 to the return value of input.nextInt().

Your while loop is also off, as i should never be bigger than the length of the array. You should use a for-loop instead, in this fasion:

for(int i = 0; i < array.length; i++) {
    array[i] = input.nextInt();
    sum += array[i]

    if (sum > 100) {
        return;
    }
}

canhazbits · Accepted Answer · 2013-10-20 17:12:41Z

0

You need to increment the i variable; currently its value is always 0, so you're only setting the first element in the array.

answered Oct 20, 2013 at 17:12

canhazbits

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Comments

La-comadreja · Accepted Answer · 2013-10-20 17:14:06Z

public class December2012 {
    public static void main(String[] args) {
        int[] array = new int[100];
        int sum = 0;
        int i = 0;
        Scanner input = new Scanner(System.in);
        while (sum <= 100 && i < array.length) {
            System.out.print("Write in the " + (i + 1) + "th number: ");
            array[i] = input.nextInt();
            sum += array[i];
            i++;
        }
        System.out.print("You added: ");
        for (Integer i : array) System.out.print(i + " ");
        System.out.println("\nsum is " + sum);
    }
}

Pradeep Simha · Accepted Answer · 2013-10-20 17:12:05Z

-1

How about like this, simple way of doing:

int sum = 0;
while(true) {
   //Do calculations
   if(sum >= 100) {
      break;
   }
}

System.out.println("Sum is : " + sum);

answered Oct 20, 2013 at 17:12

Pradeep Simha

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