How to convert a char array to an int array?

Question

Say I am using this code to convert a String (containing numbers) to an array of characters, which I want to convert to an array of numbers (int).

(Then I want to do this for another string of numbers, and add the two int arrays to give another int array of their addition.)

What should I do?

import java.util.Scanner;


public class stringHundredDigitArray {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the number: ");
        String num1 = in.nextLine();
        char[] num1CharArray = num1.toCharArray();
        //for (int i = 0; i < num1CharArray.length; i++){
            //System.out.print(" "+num1CharArray[i]);
        //}

        int[] num1intarray = new int[num1CharArray.length];
        for (int i = 0; i < num1CharArray.length; i++){
            num1intarray[i] = num1CharArray[i];
        }

        for (int i = 0; i < num1intarray.length; i++){ //this code prints presumably the ascii values of the number characters, not the numbers themselves. This is the problem.
            System.out.print(" "+num1intarray[i]);
        }
    }

}

I really have to split the string, to preferably an array of additionable data types.

possible duplicate of char array to int array

Subhrajyoti Majumder
– Subhrajyoti Majumder

2014-03-14 06:13:17 +00:00
Commented Mar 14, 2014 at 6:13 — Subhrajyoti Majumder
– Subhrajyoti Majumder, Commented Mar 14, 2014 at 6:13

Zaheer Ahmed · Accepted Answer · 2014-03-14 06:15:11Z

3

try Character.getNumericValue(char); this:

for (int i = 0; i < num1CharArray.length; i++){
    num1intarray[i] = Character.getNumericValue(num1CharArray[i]);
}

answered Mar 14, 2014 at 6:15

Zaheer Ahmed

28.7k12 gold badges77 silver badges113 bronze badges

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

1 Comment

Obicere Over a year ago

Alternative would be subtracting '0', but this works perfectly.

Benjamin · Accepted Answer · 2014-03-14 06:17:55Z

1

Try This :
     int[] num1intarray = new int[num1CharArray.length];
    for (int i = 0; i < num1CharArray.length; i++)
        {
         num1intarray[i]=Integer.parseInt(""+num1CharArray[i]);
        System.out.print(num1intarray[i]); 
       }

answered Mar 14, 2014 at 6:17

Benjamin

2,3061 gold badge17 silver badges24 bronze badges

Comments

Joe · Accepted Answer · 2021-06-29 11:15:07Z

0

Short and simple solution!

int[] result = new int[charArray.length]; 
Arrays.setAll(result, i -> Character.getNumericValue(charArray[i]));

answered Jun 29, 2021 at 11:15

Joe

4225 silver badges12 bronze badges

Collectives™ on Stack Overflow

How to convert a char array to an int array?

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related