CODEWITHSUNDEEP
javaarraysstringnumbersswitch-statement
Winterone
Winterone

Reputation: 15

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

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.

Upvotes: 0

Views: 21675

Answers (5)

Code Whisperer
Code Whisperer

Reputation: 1041

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);

Upvotes: 1

Omar MEBARKI
Omar MEBARKI

Reputation: 647

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);
}

Upvotes: 1

Nicholas Hirras
Nicholas Hirras

Reputation: 2596

  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);

Upvotes: 1

flogram_dev
flogram_dev

Reputation: 42858

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.

Upvotes: 2

Saturn
Saturn

Reputation: 18149

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));

Upvotes: 0

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