C :

#include<stdio.h>
int main()
{
	double a,b,v;
	double t=3.1415927;
	int i;
	scanf("%lf",&a);
	for(i=0;i<a;i++)
	{
		scanf("%lf",&b);
		v=t*b*b*b*4.0/3.0;
		printf("%.3f\n",v);
	}
}

C++ :

#define PI 3.1415927
#include <iostream>
#include <cmath>
#include <iomanip>
#include <fstream>
using namespace std;
int main()
{
    //ifstream cin;
    //ofstream cout;
    int testcase;
    //cin.open("b.in");
    //cout.open("b.out");
    double a;
    cin>>testcase;
    while(testcase--)
    {
        cin>>a;
        cout<<setiosflags(ios::fixed)<<setprecision(3)<<(4/3.0)*PI*pow(a,3.0)<<endl;
    }

    return 0;
}

Java :

import java.util.Scanner;
class Main {
	public static final double PI=3.1415927;
	public static void main(String[] args) {
		Scanner reader=new Scanner(System.in);
		int T=reader.nextInt();
		for(int i=0;i<T;i++){			
			double a=reader.nextDouble();
			System.out.printf("%.3f",PI*(4.0/3.0)*a*a*a);
          if(i<T-1){
         	System.out.println();
          }
		}
	}
	
}