Main topics: Loop Statements Nested Loops Exercise This lab is designed to give

Question

Main topics: Loop Statements
Nested Loops
Exercise
This lab is designed to give you more practice working with loop statements, and in particular, nested
loops.

Problem Description
• For this exercise you will be creating a small Java class that will use a user validation loop to
get a number in the range of 1 to 9, inclusive. Then the program will generate a triangular
shaped figure on the screen, based on the user’s input.
• The triangular shaped figure for an input of 1 is:
11
• The triangular shaped figure for an input of 2 is:
11
2112
• The triangular shaped figure for an input of 3 is:
11
2112
321123
• The triangular shaped figure for an input of n is:
11
2112
321123
. .
. .
. .
n ... 11 ... n
• Once you have written

Explanation / Answer

Below is the desired program.

import java.util.Scanner;

public class ForLoop {
   public static void main(String arg[]){
       // create a scanner so we can read the command-line input
   Scanner scanner = new Scanner(System.in);
   // prompt for the user's input
   System.out.print("Enter your input for the triangular shaped figure : ");
   // get their input as a String
   String desiredInputFigure = scanner.next();      
   // Converted input from String to int.
   int desiredNumber = Integer.parseInt(desiredInputFigure);

// Check for input range
   if(!(desiredNumber > 0 && desiredNumber < 10)){
       System.out.println("The range of the input should be between 1 and 9");
       return;
   }
   System.out.println("The Desired output is : ");
   // method to get triangular shape based on input
   getTraingulareShape(desiredNumber);
      
   }
   // method to get triangular shape based on input
   public static void getTraingulareShape(int inputNumber){
       for(int i = 1; i <= inputNumber; i++){
           for(int j = i; j >= 1; j-- )
           System.out.print(j);
           for(int j = 1; j <= i; j++ )
           System.out.print(j);          
           System.out.println(" ");
       }
   }

}

Steps for execute this program:

1. Copy the above program into one file and save it as "ForLoop.java".

1. Start -> Run

2. Enter cmd command in Run popup.

3. cmd window will open and go to the path where ForLoop.java has been saved.

> cd "specify the path here".

4. compile program by using this below command

> javac ForLoop.java

Execute the program by using this below command

>java ForLoop

Output:

Enter your input for the triangular shaped figure : 3
The Desired output is :
11

2112

321123

Note: I have put the validation for the input value. Input value should be between 1 and 9.

If you give input value not in range 1 and 9 then output will be like this.

Output:

Enter your input for the triangular shaped figure : 11
The range of the input should be between 1 and 9

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