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Thread: Simplify 2 for loops into one

  1. #1
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    Exclamation Simplify 2 for loops into one

    Hi all,

    I am new to this forum and in need of help for my course of study.

    Below is my java code:

    for(int i=1; i<barcode.length(); i+=2)
    {
    char x = barcode.charAt(i);
    String y = Character.toString(x);
    int z = Integer.parseInt(y);
    evendigit = evendigit + z;
    }


    for(i=0; i<barcode.length(); i+=2)
    {
    char x = barcode.charAt(i);
    String y = Character.toString(x);
    z = Integer.parseInt(y);
    odddigit = odddigit + z;

    }

    The difference is i=1 and i=0;
    I have tried using while loops but failed.
    Please provide some hints.

    Thank you all!

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Simplify 2 for loops into one

    If you use a for loop and look at each of the characters in turn with the loop's index, the value of the index can be used with an if statement to detect the position of the character. The index's value will be either even or odd. Use the modulus operator to check the index's value:
    theIndex % 2 will return 0 or 1 depending on if the index is even or odd

    Please wrap all posted code in code tags.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Simplify 2 for loops into one

    Quote Originally Posted by Norm View Post
    If you use a for loop and look at each of the characters in turn with the loop's index, the value of the index can be used with an if statement to detect the position of the character. The index's value will be either even or odd. Use the modulus operator to check the index's value:
    theIndex % 2 will return 0 or 1 depending on if the index is even or odd

    Please wrap all posted code in code tags.
    Thanks for your reply.
    I will try it out!

    Sorry its my first time here, will take note in the future!

    Thank you!!!

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