使用扫描仪从控制台读取双精度

import java.util.Scanner;


public class DoubleInputOutput {
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    public static void main(String cLA[]) {


        Scanner myInput = new Scanner(System.in);


        double firstNumber, secondNumber, summation;


        firstNumber = myInput.nextDouble();

        secondNumber = myInput.nextDouble();


        summation = firstNumber + secondNumber;


        System.out.printf("%.2f\n", summation);

        System.out.println(summation);

    }

}