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Thread: Print odd, even and zero digits from an int

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    Default Print odd, even and zero digits from an int

    Hello there. Here is my task which I am stuck on:
    "Design and implement an application that determines and prints the number of odd, even and zero digits in an integer value read from the keyboard."

    I have made variable pos the place at which the scanner is scanning a particular digit and made variable length equal the position of the 'farthest right' digit so that the scanning moves from right to left, checking each value of pos. It compiles and runs but the results I get are wrong. I would much appreciate any advice. Even if that means not using a for loop and starting fresh.
    Thanks

     
    //numbers.java
    import java.util.Scanner;
     
    public class numbers 
    {
      public static void main (String[] args)
      {
        int num, pos, odd=0, even=0, zero=0, length = 0;
     
        Scanner scan = new Scanner (System.in);
        System.out.println ("Please enter an integer: ");
        num = scan.nextInt();
     
        //.length() etc
     
     
        length = String.valueOf(num).trim().length();
     
          for (pos = length - 1; pos >= 0; pos--)
          {
            if (pos == 0)
              zero++;
            if (pos % 2 == 0)
              even++;
            if (pos % 2 != 0)
              odd++;
          }
     
       System.out.println("zeros: " + zero);
       System.out.println("evens: " + even);
       System.out.println("odds: " + odd);
      }
    }


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    Default Re: Print odd, even and zero digits from an int

    Why are you using the pos variable to determine whether the digit at that index is even or odd? That's just the index, not the digit itself.
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    Default Re: Print odd, even and zero digits from an int

    Adding to that, have a look at the Code Conventions.
    Code Conventions for the Java Programming Language: Contents
    Class names start with an upper case letter. Also avoid class names that are already in the JRE.

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    Default Re: Print odd, even and zero digits from an int

    Quote Originally Posted by KevinWorkman View Post
    Why are you using the pos variable to determine whether the digit at that index is even or odd? That's just the index, not the digit itself.
    Ok so how can I pinpoint the integer at the position of pos and compare it to zero, even and odd ?

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    Default Re: Print odd, even and zero digits from an int

    Have a look at the String and Character classes they have some useful methods.

    For example you could use:

    char result = num.charAt(pos);

    to get the character at the given position and then use:

    int x = Character.getNumericValue(result);

    to convert it to an integer.

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