storing string in an integer array.

Question

I am trying to store a string into an integer array with the following code:

public LargeInteger(String s) { 
 for (int i = 0; i < s.length(); i++) {
 intArray[i] = Integer.parseInt( s.charAt(i));
 }
}

eclipse is giving me an error saying: the method parseInt(string) is not applicable for the arguments (char)

What am I doing wrong?

Answer 1

You need to parse the char, or convert it to a String.

If you're trying to get one digit at a time, and you know your input is a digit, then the easiest way to convert a single digit to an int is just

intArray[i] = Character.digit(s.charAt(i), 10); // in base 10

If you want to keep using Integer.parseInt, then just do

intArray[i] = Integer.parseInt(String.valueOf(s.charAt(i)));
// or
intArray[i] = Integer.parseInt(s.substring(i, i+1));

• Sackling: thanks, This makes sense but I am still getting an error probably because of something else I am doing wrong..

Answer 2

That's because Integer.parseInt() expects a String as parameter, while you are passing a char (s.charAt() returns a char).

Since you are creating the array one digit at a time, a better way to get the decimal representation would be:

intArray[i] = s.charAt(i) - '0';

Answer 3

char is not a String so use a substring function s.substring(i, i+1) or better intArray[i] = s.charAt(i)

Answer 4

s.charAt returns a char. + parseInt take a String = Eclipse gives you the compilation error

You may create a String from the char if really needed:

s.charAt(i)+""

Answer 5

String[] split = s.split("");
int[] nums = new int[split.length];
for(int i = 0; i < split.length; i++){
 nums[i] = Integer.parseInt(split[i]);
}

Answer 6

public class Storing_String_to_IntegerArray 
{
 public static void main(String[] args) 
 {
 System.out.println(" Q.37 Can you store string in array of integers. Try it.");
 String str="I am Akash";
 int arr[]=new int[str.length()];
 char chArr[]=str.toCharArray();
 char ch;
 for(int i=0;i<str.length();i++)
 {
 arr[i]=chArr[i];
 }
 System.out.println("\nI have stored it in array by using ASCII value");
 for(int i=0;i<arr.length;i++)
 {
 System.out.print(" "+arr[i]);
 }
 System.out.println("\nI have stored it in array by using ASCII value to original content");
 for(int i=0;i<arr.length;i++)
 {
 ch=(char)arr[i];
 System.out.print(" "+ch);
 }
 }
}