OJ Board

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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;

public class Main {

    static BigDecimal num, sum;
    static String line;

    public static void main(String[] args) throws IOException {
        BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
        int t = Integer.parseInt(input.readLine());
        while (t > 0) {
            sum = BigDecimal.ZERO;
            while (input.ready()) {
                line = input.readLine();
                if(line.length() == 1 && line.charAt(0) == '0') {
                    break;
                }
                num = new BigDecimal(line);
                sum = sum.add(num);
            }
            t--;
            System.out.println(sum.stripTrailingZeros().toPlainString());
        }
    }
}

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while (input.ready()) {
    line = input.readLine();

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while ( (line = input.readLine()) != null ) {

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num = new BigDecimal(line.trim());

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1
0.0
0

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thanks brianfry

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1
0.01
0.09
0

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1
0.00000000000007
0

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0.00000000000007

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7E-14