For Loop and Void Method Questions

Question

Question 1: How would I write a for loop that repeats the according to the number entered, to prompt the user to enter a number (double) between 1 and 100. If the number is outside this range it is not accepted.
Question: 2 Also how would I write a for loop to do sum and find the average of the array numbers in a seperate void method( does not return anything to the main method)?
Question: 3 (first code snippet) With my for loop that is used to process each number in the array and square it and cube it and display the results to 2 decimal places. How do I make it so say I want the array to allow me to enter 2 numbers (so I enter 2 numbers) then it asks me to enter a number between 1 -100 (which will prompt 2 times) that it shows me the results for the entered numbers between 1-100 after one another instead of number then result number then result like I how it now.
for (int index = 0; index < howNum; index++) // process each number in the array
          enterYourNumbers = JOptionPane.showInputDialog   
                        ("Enter a number between 1 and 100");                       
          numArray = new double[howNum]; 
        try
            numArray[index] = Double.parseDouble(enterYourNumbers);
        catch (NumberFormatException e)
                enterYourNumbers = JOptionPane.showInputDialog
                          ("Enter a number between 1 and 100");                          
            DecimalFormat fmt = new DecimalFormat ("###,###.00");
            JOptionPane.showMessageDialog(null, enterYourNumbers + " "  + "squared is "  + fmt.format(calcSquare(numArray[index]))
                                          + "\n" + enterYourNumbers + " " +  "cubed is " + fmt.format(calcCube(numArray[index])));                                                                           
            wantToContinue = JOptionPane.showInputDialog ("Do you want to continue(y/n)? ");
  while (wantToContinue.equalsIgnoreCase("y"));
import javax.swing.*;
import java.text.DecimalFormat;
public class Array
    public static void main(String[] args)
        int howNum = 0;
        int whichNum = 0;     
        double[] numArray;
        boolean invalidInput = true;
        String howManyNumbers, enterYourNumbers, wantToContinue;
  do // repeat program while "y"
      do // repeat if invalid input
        howManyNumbers = JOptionPane.showInputDialog
                    ("How many numbers do you want to enter");                     
        try
             howNum = Integer.parseInt(howManyNumbers);
             invalidInput =  false;
        catch (NumberFormatException e )
            howManyNumbers = JOptionPane.showInputDialog
                        ("How many numbers do you want to enter");
      while (invalidInput);
      for (int index = 0; index < howNum; index++) // process each number in the array
          enterYourNumbers = JOptionPane.showInputDialog   
                        ("Enter a number between 1 and 100");                       
          numArray = new double[howNum]; 
        try
            numArray[index] = Double.parseDouble(enterYourNumbers);
        catch (NumberFormatException e)
                enterYourNumbers = JOptionPane.showInputDialog
                          ("Enter a number between 1 and 100");                          
            DecimalFormat fmt = new DecimalFormat ("###,###.00");
            JOptionPane.showMessageDialog(null, enterYourNumbers + " "  + "squared is "  + fmt.format(calcSquare(numArray[index]))
                                          + "\n" + enterYourNumbers + " " +  "cubed is " + fmt.format(calcCube(numArray[index])));                                                                           
            wantToContinue = JOptionPane.showInputDialog ("Do you want to continue(y/n)? ");
  while (wantToContinue.equalsIgnoreCase("y"));
    public static double calcSquare(double yourNumberSquared)
        return yourNumberSquared * yourNumberSquared;       
    public static double calcCube(double yourNumberCubed)
       return yourNumberCubed * yourNumberCubed * yourNumberCubed;              
    public static void calcAverage(double yourNumberAverage)
}

Answer 1

DeafBox wrote:
Question 1: How would I write a for loop that repeats the according to the number entered, to prompt the user to enter a number (double) between 1 and 100. If the number is outside this range it is not accepted. Use a while loop instead.
Question: 2 Also how would I write a for loop to do sum and find the average of the array numbers in a seperate void method( does not return anything to the main method)? Why would you want to use 2 methods. Use the loop to sum the numbers. Then after the loop a single line of code calculates the average.
Question: 3 (first code snippet) With my for loop that is used to process each number in the array and square it and cube it and display the results to 2 decimal places. How do I make it so say I want the array to allow me to enter 2 numbers (so I enter 2 numbers) then it asks me to enter a number between 1 -100 (which will prompt 2 times) that it shows me the results for the entered numbers between 1-100 after one another instead of number then result number then result like I how it now. If I understand you correctly, use 2 loops. One gathers user inputs and stores them in an array/List. The second loop iterates over the array/List and does calculations.