How to store zero in a char array instead of it storing null [JAVA]

Question

Apologies for the possibly poorly written question and lack of knowledge.

Im trying to store the actual character "0" in an array but it keeps defaulting to null. Is there anyway to avoid this? Below is a modified version of my code. I am trying to compare two binary numbers and then when the numbers dont match, the following numbers become all zeroes. Any help would be greatly appreciated

        String fullBinOne = "1010101010100101"
        String fullBinTwo = "1010101010101010"
        char[] charBinOne = fullBinOne.toCharArray();
        char[] charBinTwo = fullBinTwo.toCharArray();
        char[] routeSummaryArray = fullBinOne.toCharArray();

        int subnetCIDR = 0;

        for (int i = 0; i < charBinOne.length; i++){
            if (charBinOne[i] != charBinTwo[i]) {
                subnetCIDR = i;
                break;
            }
        }

        for (int i = subnetCIDR; i < charBinOne.length; i++){
            routeSummaryArray[i] = (char)0;
        }

The output of routeSummaryArray is "101010101010 " instead of being 1010101010100000

The character 0 is indicated by '0', not by (char) 0.

khelwood
– khelwood

2020-07-29 08:05:16 +00:00
Commented Jul 29, 2020 at 8:05 — khelwood
– khelwood, Commented Jul 29, 2020 at 8:05
How do you output routeSummaryArray?

luk2302
– luk2302

2020-07-29 08:06:53 +00:00
Commented Jul 29, 2020 at 8:06 — luk2302
– luk2302, Commented Jul 29, 2020 at 8:06
routeSummaryArray[i] = '0';

Gayan Weerakutti
– Gayan Weerakutti

2020-07-29 13:45:37 +00:00
Commented Jul 29, 2020 at 13:45 — Gayan Weerakutti
– Gayan Weerakutti, Commented Jul 29, 2020 at 13:45

Ivo Mori · Accepted Answer · 2020-07-30 07:07:15Z

1

routeSummaryArray[i] = (char)0;

(char)0 is typecasting the integer value(here 0) to character. Here, the ASCII value of the integer value (here 0) will be stored to the specified index of the character array named "routeSummaryArray".

ASCII value of 0 is null. So it outputs as "101010101010".

If you need output as 1010101010100000, either use

routeSummaryArray[i] = '0';

or,

routeSummaryArray[i] = (char)48;

'0' is the ASCII value of 48".

For your reference, http://www.asciitable.com/

edited Jul 30, 2020 at 7:07

Ivo Mori

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answered Jul 30, 2020 at 6:07

Shalini Ravi

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1 Comment

Maurice Perry Over a year ago

But more importantly, character '0' has a UNICODE value of 48.

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