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Thread: anyone can tell me how this code works?

  1. #1
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    Default anyone can tell me how this code works?

    public void addBinary(String a, String b) throws IOException{

    StringBuilder sb = new StringBuilder();
    int i=a.length()-1,j= b.length()-1, carry = 0;

    while (i>=0 || j>=0){
    int suma = carry;
    if(j >=0) {
    suma = suma + b.charAt(j--) - '0';
    }
    if(i >=0) {
    suma = suma + a.charAt(i--) - '0';
    }
    sb.append(suma % 2);
    carry= suma / 2;
    }
    if (carry!= 0){
    sb.append(aca);
    }
    }

    this code works perfectly. but i can understand how this logic works ( suma = suma + b.charAt(j--) - '0'; )
    can someone can explain me ? thank you folks
    sorry for my english

  2. #2
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    Default Re: anyone can tell me how this code works?

    The line simply converts a character value of '0' or '1' to a binary value of 0 or 1 and adds it to a running sum. The sum is reset for each iteration of the loop.

    And the code shown does not work perfectly because aca is not defined and the result of adding two binary numbers ends up being reversed.

    Regards,
    Jim

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    Default Re: anyone can tell me how this code works?

    thanks. this code work fine, aca is carry, i forget to change it
    thank you for the answer

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    Default Re: anyone can tell me how this code works?

    You're welcome but the code does not work fine. You have a void method called addBinary which computes the addition but can't return anything and doesn't print out an answer.

    Regards,
    Jim

  5. The Following User Says Thank You to jim829 For This Useful Post:

    johndoe123 (November 27th, 2018)

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