Greenfoot

Mepp

2013/2/27

#

Hi, I searching for a way to split up the individual numbers of a variable(type=long) to several integers in an Array, so if i have the long x=54321, i later have an array a with the value a=5, a=4, and so on.

Jonas234

2013/2/27

#

public static ArrayList<Integer> test(int x)
    {
        ArrayList<Integer> intList = new ArrayList<Integer>();
        int i =1;
        while (x!=0)
        {
            int array = x%(int) (Math.pow(10,i));
            x=x-array;
            if(i>1)
            {
                intList.add(array/(int) (Math.pow(10,i-1)));
            }
            else
            {
                intList.add(array);
            }
            i++;
        }
        return intList;
    }

If you really want an Array instead of an ArrayList you just need to determine the size of the Array beforehand. And of course you need to exchange the int with a long but it shouldn't really matter.

Mepp

2013/2/27

#

Which ints should I replace, im just getting Errors?

Jonas234

2013/2/27

#

public static ArrayList<Long> test(long x)
    {
        ArrayList<Long> longList = new ArrayList<Long>();
        int i =1;
        while (x!=0)
        {
            long array = x%(long) (Math.pow(10,i));
            x=x-array;
            if(i>1)
            {
                longList.add(array/(long) (Math.pow(10,i-1)));
            }
            else
            {
                longList.add(array);
            }
            i++;
        }
        return longList;
}

Nearly every long. Now it is working for long.

Mepp

2013/2/27

#

Ok, and how can I get some values out of this? My code was this:

runTime=makeRTime(rTime);
int Lenght=getLenght(rTime);
        while(Lenght!=0){
            Number n=new Number(runTime[Lenght]);
        }

It marked runTime and says "array.required, but java.util.ArrayList<java.lang.Long> found"

danpost

2013/2/27

#

As an alternative, the following will do the job:

// with
long x = 54321;
// use
String xStr = "" + x;
int[] a = new int[xStr.length()];
for (int i=0; i<a.length; i++) a[i] = Integer.valueOf(xStr.substring(i, i+1));

BTW, this will work for any non-negative whole numbers (0, 1, 2, ...).

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Split an long in the seperat numbers