Question

Coding Requirements for Assignment2_1.java:

Based on Assignment1.java, re-do all 7 methods from triangle_0 to triangle_6 by storing characters (which could be symbols or digits) in a 2D "square" array, meaning it has equal number of rows and columns. Now, because each triangle is supposed to contain rows filled with different number of characters, you are required to fill each row with only required number of characters in this square array. For example, in an up-side-down 8-row triangle of "$", the 3rd row from top should be filled with only 6 "$" and leave two not assigned with anything (i.e., each is null).

This assignment also requires to change all while-loop statements to for-loop statements, or the other way around, depending which was used on Assignment1. For each method of triangle_x, you should comment out the entire block of statements of the method you did in Assignment1, and write new statements on top of the comment. This allows your old method to be compared and verified with the new one developed in this work.

Finally, because you won't print every character and line as in Assignment1, instead, you store them in arrays. So, to print the array to show the triangle at the end of each triangle_x method, you are particularly required to use only enhanced for-loop statements, i.e., the one using ":" with no counter or index variables.

//Assignment 1 code

public class Assignment1 {
   public static void main(String args[]) {
int totalLines = Integer.parseInt(args[0]);
  
triangle_0(totalLines);
  
triangle_1(totalLines, args[1]);
triangle_2(totalLines);
triangle_3(totalLines);
triangle_4(totalLines, args[1]);
triangle_5(totalLines);
triangle_6(totalLines);
   }
  
   private static void triangle_0(int max){
int lineCount = 0, widthCount = max;
  
System.out.println("\ntriangle_0\n");
while (lineCount <= max){
while (widthCount >= 1){
if (widthCount == 1)
System.out.println("*");//move to new line after print, if it is the last "*" of the line
else
System.out.print("*");
widthCount = widthCount - 1;
}
lineCount = lineCount + 1;
widthCount = max - lineCount;
}
   }
  
   private static void triangle_1(int max,String displayvalue){
       int lineCount = 0, widthCount = max;
  
System.out.println("\ntriangle_1\n");
while (lineCount <= max){
while (widthCount >= 1){
if (widthCount == 1)
System.out.println(displayvalue);//move to new line after print, if it is the last "*" of the line
else
System.out.print(displayvalue);
widthCount = widthCount - 1;
}
lineCount = lineCount + 1;
widthCount = max - lineCount;
}
   }
  
   private static void triangle_2(int max){
       int lineCount = 0, widthCount = max;
  
System.out.println("\ntriangle_2\n");
while (lineCount <= max){
while (widthCount >= 1){
if (widthCount == 1)
System.out.println(max-lineCount);//move to new line after print, if it is the last "*" of the line
else
System.out.print(max-lineCount);
widthCount = widthCount - 1;
}
lineCount = lineCount + 1;
widthCount = max - lineCount;
}
   }
  
   private static void triangle_3(int max){
       int lineCount = 0, widthCount = max;
  
System.out.println("\ntriangle_3\n");
while (lineCount <= max){
while (widthCount >= 1){
if (widthCount == 1)
System.out.println(widthCount);//move to new line after print, if it is the last "*" of the line
else
System.out.print(widthCount);
widthCount = widthCount - 1;
}
lineCount = lineCount + 1;
widthCount = max - lineCount;
}
   }
  
   private static void triangle_4(int max,String displayvalue){
       int lineCount , widthCount;
       System.out.println("\ntriangle_4\n");
       for(lineCount=1;lineCount<=max;lineCount++){
           for(widthCount=1;widthCount<lineCount;widthCount++){
               System.out.print(displayvalue);
           }
           System.out.println(displayvalue);
       }
   }
  
   private static void triangle_5(int max){
       int lineCount , widthCount;
       System.out.println("\ntriangle_5\n");
       for(lineCount=1;lineCount<=max;lineCount++){
           for(widthCount=1;widthCount<lineCount;widthCount++){
               System.out.print(lineCount);
           }
           System.out.println(lineCount);
       }
   }
  
   private static void triangle_6(int max){
       int lineCount , widthCount;
       System.out.println("\ntriangle_6\n");
       for(lineCount=1;lineCount<=max;lineCount++){
           for(widthCount=1;widthCount<lineCount;widthCount++){
               System.out.print(widthCount);
           }
           System.out.println(widthCount);
       }
   }
  
}

CCWindowsSystem32cmd.exe Microsoft Windows [Version 18.0.17134.765] (c) 2018 Microsoft Corporation. All rights reserved. E:\>javac Assignment4.java E: \>java Assignment4 4$ triangle_e triangle_1 $$$$ triangle_2 4444 333 22 1 triangle_3 4321 321 1 triangle_4 $ $$$$ 01:27 ENG O Type here to search A INTL 05-06-2019 CCAWindows System32cmd.exe 4444 1 triangle_3 4321 321 21 1 triangle_4 $$ $$$$ triangle_5 333 4444 triangle_6 1 12 123 1234 E:\>. 01:27 ENG O Type here to search O INTL 05-06-2019

Answer 1

JAVA PROGRAM :- NOTE :- I have modified the code such that functions don't print the values but store in a 2d array i.e a square matrix and return that matrix to the caller function. There I print the matrix in-order to show what is stored. I have attached the output to this answer and also switched while loop into for loop

public class Assignment1 {
  
static void print_t_d_arr(char[][] arr){
for(int i = 0;i<arr.length;i++){
for(int j = 0;j<arr.length;j++){
System.out.print(arr[i][j]);
}
System.out.println();
}
}
  
public static void main(String args[]) {
  
int totalLines = Integer.parseInt(args[0]);
  
char[][] matrix = new char[totalLines][totalLines];
  
matrix = triangle_0(totalLines);
System.out.println("\ntriangle_0\n");
print_t_d_arr(matrix);
  
matrix = triangle_1(totalLines, args[1]);
System.out.println("\ntriangle_1\n");
print_t_d_arr(matrix);
  
matrix = triangle_2(totalLines);
System.out.println("\ntriangle_2\n");
print_t_d_arr(matrix);
  
matrix = triangle_3(totalLines);
System.out.println("\ntriangle_3\n");
print_t_d_arr(matrix);

matrix = triangle_4(totalLines, args[1]);
System.out.println("\ntriangle_4\n");
print_t_d_arr(matrix);
  
matrix = triangle_5(totalLines);
System.out.println("\ntriangle_5\n");
print_t_d_arr(matrix);
  
matrix = triangle_6(totalLines);
System.out.println("\ntriangle_6\n");
print_t_d_arr(matrix);
}
  
private static char[][] triangle_0(int max){
char[][] td_arr = new char[max][max];
  
for(int lineCount = 0; lineCount <= max; lineCount++){
for(int widthCount = max - lineCount; widthCount >= 1; widthCount--){
td_arr[lineCount][widthCount-1] = '*';
}
}
  
return td_arr;
}
  

private static char[][] triangle_1(int max,String displayvalue){
char[][] td_arr = new char[max][max];
  
for(int lineCount = 0; lineCount <= max; lineCount++){
for(int widthCount = max - lineCount; widthCount >= 1; widthCount--){
td_arr[lineCount][widthCount-1] = displayvalue.charAt(0);
}
}
  
return td_arr;
}
  
private static char[][] triangle_2(int max){
char[][] td_arr = new char[max][max];
  
for(int lineCount = 0; lineCount <= max; lineCount++){
for(int widthCount = max - lineCount; widthCount >= 1; widthCount--){
td_arr[lineCount][widthCount-1] = Character.forDigit(max-lineCount,10);
}
}
  
return td_arr;
}

private static char[][] triangle_3(int max){
char[][] td_arr = new char[max][max];
  
for(int lineCount = 0; lineCount <= max; lineCount++){
for(int widthCount = max - lineCount; widthCount >= 1; widthCount--){
td_arr[lineCount][widthCount-1] = Character.forDigit(widthCount,10);
}
}
  
return td_arr;
}
  
  
private static char[][] triangle_4(int max,String displayvalue){
char[][] td_arr = new char[max][max];
  
for(int lineCount = 0; lineCount < max; lineCount++){
for(int widthCount = 0; widthCount <= lineCount ; widthCount++){
td_arr[lineCount][widthCount] = displayvalue.charAt(0);
}
}
  
return td_arr;
}

private static char[][] triangle_5(int max){
char[][] td_arr = new char[max][max];
  
for(int lineCount = 0; lineCount < max; lineCount++){
for(int widthCount = 0; widthCount <= lineCount ; widthCount++){
td_arr[lineCount][widthCount] = Character.forDigit(lineCount+1,10);
}
}
  
return td_arr;
}

private static char[][] triangle_6(int max){
char[][] td_arr = new char[max][max];
  
for(int lineCount = 0; lineCount < max; lineCount++){
for(int widthCount = 0; widthCount <= lineCount ; widthCount++){
td_arr[lineCount][widthCount] = Character.forDigit(widthCount+1,10);
}
}
  
return td_arr;
}

Output:-

Interactive mode CommandLine Argunents OFF Focus View: 4 $ OFF Version: JDK 18.e.1 Stdin Inputs... External Libraries O Add Extersal Library O Execute My Projects Collaborate More Options Save Recent FAQ Result... CPu Tine: .15 sec(s), Momory: 38064 ALLobyters) triangle_e triangle 1 $$$$ $$$ $.. triangle 2 4444 333 22- 1. triangle 3 1234 123 12.- 1.. triangle 4 $$ $$$. $$$s triangle 5 1.1 22.. 333 4444 triangle 6 1-. 12- 123 1234
  
}