C :

#include<stdio.h>
int main()
{
	float r,h,pi=3.1415926;
	scanf("%f%f",&r,&h);
	printf("Area=%.3f",2*pi*r*r+2*pi*r*h);
	
}

C++ :

#include<stdio.h>
int main()
{
	//freopen("1020A2.in","r",stdin);
	//freopen("1020A2.out","w",stdout);
    float pi=3.1415926535,r,h,s;
    scanf("%f%f",&r,&h);
    s=2*pi*r*r+2*pi*r*h;
    printf("Area=%.3f",s);
}

Java :

import java.util.Scanner;
public class Main {
    public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        double r=input.nextDouble();
        double h=input.nextDouble();
        double s=r*r*Math.PI*2+h*2*Math.PI*r;
        System.out.println("Area="+String.format("%.3f",s));
    }
}

Python :

# coding=utf-8
#python2
pi=float(3.1415926)
r,h=map(float,raw_input().split())
s=float(pi*r*r*2+pi*r*2*h)
print "Area=%.3f"%s

C# :

using System;
using System.Collections.Generic;
using System.Diagnostics.SymbolStore;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    internal class Program
    {
        static void Main()
        {
            //int[] days = { 31,28,31,30,31,30,31,31,30,31,30,31};
            string[] a1 = Console.ReadLine().Split();
            double r = Convert.ToDouble( a1[0]);
            double h = Convert.ToDouble( a1[1]);
            float pi = 3.1415926f;
            double S = pi * Math.Pow(r, 2) * 2 + 2 * pi * r * h;

            Console.WriteLine("Area=" +Math.Round( S,3));

            Console.ReadKey();



        }
    }
}