??????

java

import java.util.Scanner;

public class Main{
    private static double add(double a, double b){
        return a + b;
    }

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        double x = sc.nextDouble(), y = sc.nextDouble();

        System.out.printf("%.2f",add(x,y));
    }
}

C++

#include <iostream>
#include <cstdio>

using namespace std;

double doubleadd(double a, double b){
    return a + b;
}

int main(){
    double a, b;
    cin >> a >> b;
    printf("%.2lf", doubleadd(a,b));
    return 0;
}

PY3

a, b = map(float,input().split())

def adddouble(a,b):
    return a + b

print("%.2f"% adddouble(a,b))