Question

Question: Squares. Write a program class named SquareDisplay that asks the user for a positive integer no greater than 15. The program should then display a square on the screen using the character ‘X’. The number entered by the user will be the length of each side of the square. For example, if the user enters 5, the program should display the following:

      XXXXX
      XXXXX
      XXXXX
      XXXXX
      XXXXX

INPUT and PROMPTS. The program prompts for an integer as follows: "Enter an integer in the range of 1-15: ".

OUTPUT . The output should be a square of X characters as described above.

CLASS NAMES. Your program class should be called SquareDisplay

What is the problem with this code....error messages received: all the way up to java 23 with error message.

SquareDisplay.java:1: error: class, interface, or enum expected
public static void main(String[] args) {
              ^
SquareDisplay.java:2: error: illegal character: '\u00a0'
    Scanner keyboard = new Scanner(System.in);
^
SquareDisplay.java:2: error: illegal character: '\u00a0'
    Scanner keyboard = new Scanner(System.in);
^
SquareDisplay.java:2: error: illegal character: '\u00a0'
    Scanner keyboard = new Scanner(System.in);
^
SquareDisplay.java:3: error: illegal character: '\u00a0'
    System.out.print("Enter a number between 1-15: ");
^
SquareDisplay.java:3: error: illegal character: '\u00a0'
    System.out.print("Enter a number between 1-15: ");
^
SquareDisplay.java:3: error: illegal character: '\u00a0'
    System.out.print("Enter a number between 1-15: ");
^
SquareDisplay.java:3: error: class, interface, or enum expected
    System.out.print("Enter a number between 1-15: ");
          ^
SquareDisplay.java:4: error: illegal character: '\u00a0'
    int number = keyboard.nextInt();
^
SquareDisplay.java:4: error: illegal character: '\u00a0'
    int number = keyboard.nextInt();
^
SquareDisplay.java:4: error: illegal character: '\u00a0'
    int number = keyboard.nextInt();
^
SquareDisplay.java:4: error: class, interface, or enum expected

Program below:

public static void main(String[] args) {
    Scanner keyboard = new Scanner(System.in);
    System.out.print("Enter a number between 1-15: ");
    int number = keyboard.nextInt();
    validateNumber(keyboard, number);
    outputMatrix("X", number);
   
    keyboard.close();
}
static void validateNumber(Scanner keyboard, int number) {
    while (number < 1 || number > 15) {
        System.out.println("Sorry, that's an invalid number.");
        System.out.print("Enter an integer in the range of 1-15: ");
        number = keyboard.nextInt();
    }
}
static void outputMatrix(String charToOutput, int number) {
    for (int row = 0; row < number; row++) {
        for (int column = 0; column < number; column++) {
            System.out.print(charToOutput);
        }
        System.out.println();
    }
}

Answer 1

SquareDisplay.java

import java.util.Scanner;

public class SquareDisplay {

   public static void main(String[] args) {
      
       //Declaring variable
       int number;
      
       //Scanner class object is used to read the inputs entered by the user
   Scanner keyboard=new Scanner(System.in);
  
   /* This while loop continues to execute
   * until the user enters a valid number as input.
   */
   while(true)
   {
      
       //Getting the number entered by the user
   System.out.print("Enter a number between 1-15 :");
   number = keyboard.nextInt();
  
   //Checking the number is within the range or not
   if(number<1 || number>15)
   {
       /* If the user entered number is not with
       * in range(between 1-15) displaying error message
       */
       System.out.println("** Invalid Input **");
       continue;
   }
   else
       break;
   }
  
   //Calling the method by passing the user entered number as argument
   displayMatrix(number);
  

   }

   //This method will display the matrix based in the user entered number
   private static void displayMatrix(int number) {
      
       //Displaying the matrix
       for(int i=1;i<=number;i++)
       {
           for(int j=1;j<=number;j++)
           {
           System.out.print('X');
           }
           System.out.println();
       }
      
   }

}

__________________

Output:

Enter a number between 1-15 :-1
** Invalid Input **
Enter a number between 1-15 :18
** Invalid Input **
Enter a number between 1-15 :5
XXXXX
XXXXX
XXXXX
XXXXX
XXXXX

__________Thank You