Question

Write a java code prompting the user to input the number of balls they want to buy and also input those ball's radius. Once the input has been prompted, print out their volumes and surface areas.

Answer 1

Here is code:

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

public class VolAndSurA {

public static void main(String[] args) {
DecimalFormat df = new DecimalFormat("####0.00"); // round upto 2 decimal places
int count;
double pi = 3.14;
Scanner s = new Scanner(System.in);
System.out.print("Enter number of balls : ");
count = s.nextInt();
float[] r = new float[count];
double[] area = new double[count];
double[] volume = new double[count];

for (int i = 0; i < count; i++) {
System.out.print("Enter the radius of sphere:" + (i + 1) + "# ");
r[i] = s.nextFloat();
area[i] = 3 * pi * r[i] * r[i];
volume[i] = 1.333 * pi * r[i] * r[i] * r[i];
}
System.out.println("");
for (int i = 0; i < count; i++) {
System.out.println("Surface Area of sphere of radius : " + r[i] + " is : " + df.format(area[i]));
System.out.println("Volume of sphere of radius : " + r[i] + " is : " + df.format(volume[i]));
System.out.println("");
}
  
}
}

Output:

Enter number of balls2 Enter the radius f sphere: 1# 25.25 Enter the radius f sphere: 2# 68.25 Surface Area of sphere of radius 25.25 is 6005.84 Volume of sphere of radius 25.25 is 67382.01 Surface Area of sphere of radius 68.25 is43878.95 Volume of sphere of radius 68.25 is1330662.03