help in describe code

hi, can you tell me what this code do?
is from binary add

Code:

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static String [] lookupTable = {
        "0+0+0=00",
        "0+0+1=01",
        "0+1+0=01",
        "0+1+1=10",
        "1+0+0=01",
        "1+0+1=10",
        "1+1+0=10",
        "1+1+1=11",
};


static String lookup(char s1, char s2, char c) {
        String formula = String.format("%c+%c+%c=", s1, s2, c);
        for (String s : lookupTable) {
            if (s.startsWith(formula)) {
                return s.substring(s.indexOf("=") + 1);
            }
        }
        throw new IllegalArgumentException();
    }
    static String zeroPad(String s, int length) {
        while (s.length() < length) {
            s = "0" + s;
        }
        return s;
    } 
    static String add(String s1, String s2) {
        int length = Math.max(s1.length(), s2.length());
        s1 = zeroPad(s1, length);
        s2 = zeroPad(s2, length);
        String result = "";
        char carry = '0';
        for (int i = length - 1; i >= 0; i--) {
            String columnResult = lookup(s1.charAt(i), s2.charAt(i), carry);
            result = columnResult.charAt(1) + result;
            carry = columnResult.charAt(0);
        }
       
        if (carry == '1') {
            result = carry + result;
        }
        return result;
    }

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What happened when you ran it?

Why did you ignore what I wrote in this thead: http://www.java-forums.org/new-java/...tml#post240146?

kind regards,

Jos

because i am noob , and i cant do it, so i got this one, and i know how to put to subtration too, but why i can put with the options , with sum and sub?

Quote:

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Originally Posted by m1ke4fun

because i am noob , and i cant do it, so i got this one, and i know how to put to subtration too, but why i can put with the options , with sum and sub?

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Please see the link in my signature on asking questions the smart way.

close thread please :)