Week 2: Methods, strings and lists/[FIXED] 22. Letter pyramid

Write a program that asks the user to enter the lower case letter [a-z].
The program will then print a pyramid corresponding to the letter according to the example printouts shown below.

Example execution:
Give a lowercase letter: d
   aa
  baab
 cbaabc
dcbaabcd
 

Another example execution:
Give a lowercase letter: p
              aa
             baab
            cbaabc
           dcbaabcd
          edcbaabcde
         gedcbaabcdeg
        hgedcbaabcdegh
       ihgedcbaabcdeghi
      jihgedcbaabcdeghij
     kjihgedcbaabcdeghijk
    lkjihgedcbaabcdeghijkl
   mlkjihgedcbaabcdeghijklm
  nmlkjihgedcbaabcdeghijklmn
 onmlkjihgedcbaabcdeghijklmno
ponmlkjihgedcbaabcdeghijklmnop






import java.util.Random;
import java.util.Scanner;



public class Test{
    public static void main(String[] args){
        final Random r = new Random();
        

        // round 1
        //ADD
        // Scanner reader= new Scanner(System.in);
        // System.out.print("Give a lowercase letter: ");
        // // char user_char = Character.valueOf(reader.nextLine());
        // char user_char = reader.next().charAt(0);

        // char char_a = 'a';
        // char char_loop = 'a';
        // String str = "";
        // while (char_loop <= user_char) {
        //     str += char_loop;
        //     char_loop++;
        // }
        
        // char_loop = user_char-1;
        // while (char_loop >= char_a) {
        //     str += char_loop;
        //     char_loop--;
        // }

        // System.out.println(str);

        

        // round 2
        // // Calculate the number of rows needed
        // int num_rows = user_char - 'a' + 1;
        
        // // Loop through each row
        // for (int i = 0; i < num_rows; i++) {
        //     // Print spaces in front
        //     // eg
        //     // 'c' - 'a' = 2
        //     // num_rows = 3
        //     // BUT we want 2 spaces in front
        //     // so we do num_rows - i - 1
        //     for (int j = 0; j < num_rows - i - 1; j++) {
        //         System.out.print(" ");
        //     }
            
        //     // Print decreasing letters
        //     // row 1 - 'a'
        //     // row 2 - 'ba'
        //     // row 3 - 'cba'            
        //     for (char c = 'a'+i; c >= 'a'; c--) {
        //         System.out.print(c);
        //     }
            
        //     // Print increasing letters
        //     // start from 'a', print until user_char
        //     for (char c = 'a'; c <= user_char; c++) {
        //         System.out.print(c);
        //     }

        //     //no need to print spaces at the back
        //     // just
        //     // Move to the next line
        //     System.out.println();
        // }



        // round 3
        Scanner reader = new Scanner(System.in);
        System.out.print("Give a lowercase letter: ");
        // https://stackoverflow.com/questions/32798803/understanding-scanners-nextline-next-and-nextint-methods
        // https://stackoverflow.com/questions/13942701/take-a-char-input-from-the-scanner
        // option1
        //char user_char = reader.next().charAt(0);
        // option2
        //char user_char = reader.findInLine(".").charAt(0);
        // option3 - older syntax
        char user_char = reader.nextLine().charAt(0);


        
        // each row is a new line
        // Loop through each character from 'a' to user_char
        for (char current_char = 'a'; current_char <= user_char; current_char++) {
            // Print leading spaces
            // eg
            // 'c' - 'a' = 2
            // num_rows = 3
            // BUT we want 2 spaces in front
            for (int j = 0; j < (user_char - current_char); j++) {
                System.out.print(" ");
            }

            // Print descending characters from currentChar down to 'a'
            for (char c = current_char; c >= 'a'; c--) {
                System.out.print(c);
            }

            // Print ascending characters from 'a' up to currentChar
            for (char c = 'a'; c <= current_char; c++) {
                System.out.print(c);
            }

            // Move to the next line
            System.out.println();
        }



    }
}




Give a lowercase letter: p
               aa
              baab
             cbaabc
            dcbaabcd
           edcbaabcde
          fedcbaabcdef
         gfedcbaabcdefg
        hgfedcbaabcdefgh
       ihgfedcbaabcdefghi
      jihgfedcbaabcdefghij
     kjihgfedcbaabcdefghijk
    lkjihgfedcbaabcdefghijkl
   mlkjihgfedcbaabcdefghijklm
  nmlkjihgfedcbaabcdefghijklmn
 onmlkjihgfedcbaabcdefghijklmno
ponmlkjihgfedcbaabcdefghijklmnop

=== Code Execution Successful ===









Testing with input c
Give a lowercase letter: c
  aa
 baab
cbaabc

Testing with input g
Give a lowercase letter: g
      aa
     baab
    cbaabc
   dcbaabcd
  edcbaabcde
 fedcbaabcdef
gfedcbaabcdefg

Testing with input h
Give a lowercase letter: h
       aa
      baab
     cbaabc
    dcbaabcd
   edcbaabcde
  fedcbaabcdef
 gfedcbaabcdefg
hgfedcbaabcdefgh

Testing with input r
Give a lowercase letter: r
                 aa
                baab
               cbaabc
              dcbaabcd
             edcbaabcde
            fedcbaabcdef
           gfedcbaabcdefg
          hgfedcbaabcdefgh
         ihgfedcbaabcdefghi
        jihgfedcbaabcdefghij
       kjihgfedcbaabcdefghijk
      lkjihgfedcbaabcdefghijkl
     mlkjihgfedcbaabcdefghijklm
    nmlkjihgfedcbaabcdefghijklmn
   onmlkjihgfedcbaabcdefghijklmno
  ponmlkjihgfedcbaabcdefghijklmnop
 qponmlkjihgfedcbaabcdefghijklmnopq
rqponmlkjihgfedcbaabcdefghijklmnopqr