Calculations with array list elements.

Lillian Martin 2133 29 Oct 2014

I have an integer array list. It will always contain 5 integers. Now suppose it contains the numbers 10031. Now I want to do this calculation in the elements.

Add the numbers within this number, until you are left with a 1 or 2 digit number.

1.....0.....0.....3.....1

...1.....0......3....4

.......1.....3.....7

...........4....10 (When this occurs, separate into 1 + 0)

..............5..1 = 51. Result is 51.

I want the result when it is a double digit number. Please help.

Ask by Lillian Martin

Updated 29 Oct 2014

1 Answers

Anonymous User 29 Oct 2014

try this:

public static int yourFunction(ArrayList<Integer> list){
    String numbers = ""; 
 
    for(Integer i : list){
        numbers += String.valueOf(i);
    }
 
    String tmp_numbers; 
    while(numbers.length() > 2){
        tmp_numbers = "";
        for(int i = 0; i < numbers.length()-1; ++i){
 
            int v = Integer.parseInt(numbers.substring(i,i+1)); 
                v +=
Integer.parseInt(numbers.substring(i+1,i+2)); 
            tmp_numbers = tmp_numbers + String.valueOf(v); 
        }
        numbers = tmp_numbers; 
    }
    return Integer.parseInt(numbers);
}

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Calculations with array list elements.

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