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Thread: Variable Division Issues

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    Default Variable Division Issues

    I am trying to write code to monitor percentage progress of file transfers by dividing a running total by the total number of bytes in the file.

    For some reason, when I divide the total by the total file bytes, I continuously get zero as a result.

    total = long
    percent = long
    fileBytes = long

    		int bytesRead;
    		while((bytesRead = in.read(bytes))>0) {
    			total+=bytesRead;
    			percent = (long) ((total/fileBytes)*100);
    			System.out.println(Double.toString(percent));
    			buffout.write(bytes,0,bytesRead);
    		}
    		buffout.close();

    I can't figure out why this is happening. Is the large number of file bytes outside of Java's range for longs?


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Variable Division Issues

    In integer division: 4/5 = 0 & 5/3 = 1
    There is no fractional part. Results are rounded to whole number.
    Use float or double to get fractional parts.

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