extracting integer at each positions from a string S

Question

I accepted a number as string in java as S=1234 .NOW i want to get the integer values at s[0] s[1] s[2] s[3] .

for(int i=0;i<l;i++)// l is length of string s
    int x=s[i]-'0';// print this now

but this doesn't seem to work.

What about `int x=s.charAt(i)-'0';`? – Sergey Kalinichenko Apr 28 '16 at 18:48 — Sergey Kalinichenko, Apr 28 '16 at 18:48
Have you tried using `Integer.valueOf()`? – OneCricketeer Apr 28 '16 at 18:52 — OneCricketeer, Apr 28 '16 at 18:52
`Character.getNumericValue()`... – Alexis C. Apr 28 '16 at 18:52 — Alexis C., Apr 28 '16 at 18:52

A.Sharma · Answer 1 · 2016-04-28T18:57:57.687

1

You can get the integer by using charAt() in combination of getting the numeric value of that Character.

// Assuming you already have the Integer object "S" declared and assigned
int[] s = new int[Integer.toString(S).length()]; // create the integer array

for(int i = 0; i < Integer.toString(S).length(); i++)
{
  int x = Character.getNumericValue(S.charAt(i));
  s[i] = x;
}

edited Apr 28 '16 at 18:57

answered Apr 28 '16 at 18:52

A.Sharma

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score 1 · Answer 2 · answered Apr 28 '16 at 18:54

Java strings aren't just char arrays, they're objects, so you cannot use the [] operator. You do have the right idea, though, you're just accessing the characters the wrong way. Instead, you could use the charAt method:

for(int i = 0; i < l; i++) { // l is length of string s
    int x = s.charAt(i) - '0';
    // Do something interesting with x
}

score 0 · Answer 3 · edited May 23 '17 at 12:31

0

Got this information from another stack overflow response: Java: parse int value from a char

int x = Character.getNumericValue(S.charAt(i));

edited May 23 '17 at 12:31

Community

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answered Apr 28 '16 at 18:55

aus

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Once you have enough reputation, you can flag questions as duplicates. Plus, the other answer already provided that solution. – OneCricketeer Apr 28 '16 at 18:56
Oh cool, hopefully I'll be at that point soon. I must have been working on the answer at the same time. – aus Apr 28 '16 at 19:16

score 0 · Answer 4 · answered Apr 28 '16 at 19:25

You can convert an numerical string just by using Character.getNumericalValue() method. below is the way to get it.

   String num = "1234";
    char[] a=num.toCharArray();
    ArrayList<Integer> p = new ArrayList<>();
    for(int i=0; i<a.length; i++){
        p.add(Character.getNumericValue(a[i]));
        System.out.println(p.get(i));
    }

extracting integer at each positions from a string S

4 Answers4