C :

#include <stdio.h>
 
int main()
 
{
    int a;
   float b,p1=0.4,p2=0.8,p3=0.9,p4=0.7,p=0.85;
    while(scanf("%d",&a) != EOF)
 {
 if (a==1) 
   b=p1*p2*p3+p1*p4-p1*p2*p3*p4;
  else if(a==2)
    b=2*p*p+2*p*p*p-5*p*p*p*p+2*p*p*p*p*p;
    
  else if (a==0)
		b=0.000001;
        printf("%.6f\n",b);
		
}
    return 0;
}

C++ :

#include<string>
int main() 
{ 

    int a; 
	float p1=0.4; float p2=0.8;  float p3=0.9; float p4=0.7; float p=0.85;
 

    while(scanf("%d",&a) != EOF) 

 {if (a==1){
 	
printf("%.6f\n",p1*p2*p3+p1*p4-p1*p2*p3*p4);}
	     
 
else if(a==2)
	
{printf("%.6f\n",2*p*p+2*p*p*p-5*p*p*p*p+2*p*p*p*p*p);}  
else  {
	printf("%.6f\n",0.000001);
}
 
}
}

Java :

import java.text.DecimalFormat;
import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		
		float f[] = new float[2];
		Scanner reader = new Scanner(System.in); 
		int a;
		double p =0.85 ,
			  p1 =0.4 ,
			  p2 = 0.8,
			  p3 = 0.9,
			  p4 = 0.7;
		DecimalFormat df=new DecimalFormat("#0.000000");
		while(reader.hasNext()){
			a = reader.nextInt();
			if(a==1){
				f = null;
				f =new float[1];
				f[0]=(float)(p1*p4+p1*p2*p3-p1*p2*p3*p4);	
			}
			else if(a==2){
				f = null;
				f =new float[1];
				f[0]=(float)(2*p*p*p*p*p-5*p*p*p*p+2*p*p*p+2*p*p);
			}
			else {
				f = null;
				f =new float[1];
				f[0] = (float) 0.000001;
			}
			/*switch(a){
			case 1:f = null;
				   f =new float[1];
				   f[0]=(float)28/45;
				   break;
			case 2:f = null;
			       f =new float[1];
			       f[0]=(float)1/45;
			       break;
			case 3:f = null;
		           f =new float[1];
		           f[0]=(float)16/45;
		           break;
			case 4:f = null;
		            f =new float[1];
		            f[0]=(float)1/5;
		             break;
		    default:  f = null;
                      f =new float[1];
                      f[0]=(float)0.0001;
                       break;
			}*/
			for(int i=0;i<f.length;i++){
				
				System.out.println(df.format(f[i]));
			}
		}
	}
}