How do you get the numerical value from a string of digits?

Question

I need to add certain parts of the numerical string.

for example like.

036000291453

I want to add the numbers in the odd numbered position so like

0+6+0+2+1+5 and have that equal 14.

I tried the charAt(0)+charAt(2) etc, but it returns the digit at those characters instead of adding them. Thanks for your help.

You need to convert the string to integer then perform anything you want. Here is a link in stack: http://stackoverflow.com/questions/5585779/converting-string-to-int-in-java — Code Whisperer, Feb 27 '15 at 20:43
If the conversion is done on the entire string, it's much harder to add individual characters. — krillgar, Feb 27 '15 at 20:44
possible duplicate of [Java: parse int value from a char](http://stackoverflow.com/questions/4968323/java-parse-int-value-from-a-char) — Emil Laine, Feb 27 '15 at 20:45

Emil Laine · Answer 1 · 2015-02-27T20:49:14.797

2

Use charAt to get to get the char (ASCII) value, and then transform it into the corresponding int value with charAt(i) - '0'. '0' will become 0, '1' will become 1, etc.

Note that this will also transform characters that are not numbers without giving you any errors, thus Character.getNumericValue(charAt(i)) should be a safer alternative.

edited Feb 27 '15 at 20:49

answered Feb 27 '15 at 20:44

Emil Laine

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@Winterone: if it works then click the green check button to accept his answer. – Saturn Feb 27 '15 at 20:50
@Winterone No problem :) btw also check out `Character.getNumericValue` as suggested by Voldemort. – Emil Laine Feb 27 '15 at 20:51

Nicholas Hirras · Answer 2 · 2015-02-27T20:52:31.857

1

  String s = "036000291453";

  int total = 0;
  for(int i=0; i<s.length(); i+=2) {
    total = total + Character.getNumericValue(s.charAt(i));
  }

  System.out.println(total);

edited Feb 27 '15 at 20:52

answered Feb 27 '15 at 20:43

Nicholas Hirras

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This will just convert the ASCII value to int. The OP wants the numerical value that the character represents. – Emil Laine Feb 27 '15 at 20:48
Sorry I misread it, rewrote answer to convert each to numeric value when adding. – Nicholas Hirras Feb 27 '15 at 20:52

score 1 · Answer 3 · answered Feb 27 '15 at 20:55

1

You can use Character.digit() method

public static void main(String[] args) {
    String s = "036000291453";
    int value = Character.digit(s.charAt(1), 10); 
    System.out.println(value);
}

answered Feb 27 '15 at 20:55

Omar MEBARKI

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score 1 · Answer 4 · answered Feb 27 '15 at 20:59

Below code loops through any number that is a String and prints out the sum of the odd numbers at the end

String number = "036000291453";
int sum = 0;

for (int i = 0; i < number.length(); i += 2) {
    sum += Character.getNumericValue(number.charAt(i));
}

System.out.println("The sum of odd integers in this number is: " + sum);

score 0 · Accepted Answer · answered Feb 27 '15 at 20:44

0

I tried the charAt(0)+charAt(2) etc, but it returns the digit at those characters instead of adding them.

Character.getNumericValue(string.charAt(0));

answered Feb 27 '15 at 20:44

Saturn

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How do you get the numerical value from a string of digits?

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