Thread: Please can you help with my program? How to make it

hi please i do not understand how to make a program for the following questions, im a beginner,
For the first one i put it in but it does not work:
I use netbeans to write the program
The questions can be found in Java An Introduction to problem solving & Programming, Sixth edition

Convert the following code so that it uses nested while statements instead of for statements:
int s = 0;
int t = 1;
for (int i = 0; i < 10; i++) {
s = s + i;
for (int j = i; j > 0; j−−) {
t = t * (j - i); }
s = s * t;
System.out.println("T is " + t); }
System.out.println("S is " + s);


Question number 14:
π =pi


Suppose that your work for a beverage company. The Company wants to know the optimal cost for a cylindrical container that holds a specified volume. Write a fragment of code that uses and ask-before-iteration loop. During each iteration of the loop, your code will ask the user to enter the volume and the radius of the cylinder. Compute and display the height and cost of the container. Use the following formulas, where V is the volume, r is the radius, h is the height, and C is the cost.
h=V /(π r2)
C = 2π r (r + h)





Please & Thank you so much!

Hello, this is what i have for the firs problem:
i get class, interface, or enum expected: all ones that have a * have a problem, i know it has to do with the "int" but i dont know how to fix it.

package q21;
import java.util.Scanner;

public class Q21 {
Scanner kB = new Scanner(System.in);
public static void main(String[] args) {
}
}
*int s = 0;
*int t = 1;
*while (int i = 0; i <10; i++)
{
s = s +i;
* do (int j = i; j>0;j--)
{
t=t * (j - i);
* }
s = s * t;
* System.out.println ("T is" + t);
*}
System.out.println ("S is" + s);



As for the second problem i dont know how to start it

<package q21;
import java.util.Scanner;
 
public class Q21 {
    Scanner kB = new Scanner(System.in);
    public static void main(String[] args) {
    }
}
int s = 0;
int t = 1;
while (int i = 0; i <10; i++)
{
        s = s +i;
        do (int j = i; j>0;j--)
                {
                        t=t * (j - i);
                }
        s = s * t;
        System.out.println ("T is" + t);
}
System.out.println ("S is" + s);
>

for e13.jpg


For all the errors i get the same problem:
class, interface, enum expected

okay thanks i got it, and for the next one? i dont know where i can to get help on it.

okay so i got the problem, and it does not show any errors for both of the questions, however, when i press run it says build successful and nothing comes out. I am not sure what to do, there must be something wrong with it still, can you try to see if u can run it?

<package q21;
import java.util.Scanner;
public class Q21 {
    Scanner kB = new Scanner(System.in);
    public static void main(String[] args) {
    }
int s = 0; 
int t = 1; 
int i = 0; 
{
while (i < 10)
{ 
s = s + i; 
int j = i; 
while(j > 0) 
{ 
t = t * (j - i); 
j--; 
} 
s = s * t; 
System.out.println("T is " + t); 
i++;  
System.out.println("S is " + s);
}
}
}>

<package q22;
import java.util.Scanner;
public class Q22 {
    Scanner keyboard = new Scanner(System.in); 
    public static void main(String[] args) {
}
{   
System.out.println("Enter cylinder volume or -1 to exit:"); 
double v = keyboard.nextDouble(); 
double r = 0.0; 
if(v > 0.0) 
{ 
System.out.println("Enter cylinder radius:"); 
r = keyboard.nextDouble(); 
} 
while(v > 0.0) 
{ 
double h = v / (Math.PI * (r * r)); 
double c = 2 * Math.PI * r * (r + h); 
System.out.println("Height: " + h + "\nCost: " + c); 
System.out.println("Enter cylinder volume or -1 to exit:"); 
v = keyboard.nextDouble(); 
if(v > 0.0) 
{ 
System.out.println("Enter cylinder radius:"); 
r = keyboard.nextDouble(); 
} 
}
}
}>

like this?

<
package q21;
import java.util.Scanner;
public class Q21 {
    Scanner kB = new Scanner(System.in);
    public static void main(String[] args) {}
    int s = 0; 
    int t = 1; 
    int i = 0; 
{
        while (i < 10)
{ 
                s = s + i; 
                int j = i; 
        while(j > 0) 
{ 
                t = t * (j - i); 
j               --; 
} 
                s = s * t; 
 
System.out.println("T is " + t); 
i++;  
 
System.out.println("S is " + s);
 
}
}
}
>

<
package q22;
import java.util.Scanner;
public class Q22 {
    Scanner keyboard = new Scanner(System.in); 
    public static void main(String[] args) {
}
 
{   
        System.out.println("Enter cylinder volume or -1 to exit:"); 
        double v = keyboard.nextDouble(); 
        double r = 0.0; 
    if(v > 0.0) 
{ 
        System.out.println("Enter cylinder radius:"); 
        r = keyboard.nextDouble(); 
} 
    while(v > 0.0) 
{ 
        double h = v / (Math.PI * (r * r)); 
        double c = 2 * Math.PI * r * (r + h); 
 
System.out.println("Height: " + h + "\nCost: " + c); 
System.out.println("Enter cylinder volume or -1 to exit:"); 
         v = keyboard.nextDouble(); 
    if(v > 0.0) 
{
 
System.out.println("Enter cylinder radius:"); 
r = keyboard.nextDouble(); 
} 
}
}
}
>

--- Update ---

well wht happens when i run it it says:
run:
BUILD SUCCESSFUL (total time: 0 seconds)



that's all