Question

How do I code a pyramid and a row (reference shapes below) into JAVA using user prompts (asking for different dimensions)? I am trying to make a nested loop code and keep running into these syntax issues. Will rate for proofed code!!!

Please try to leave lots of explanation.

Pyramid:

---*---

--**--

-***-

****

Row:

---***---

This is what I have so far:

public static void main(String[] args) {
       // TODO Auto-generated method stub
      
       //start the scanner
       Scanner scanner = new Scanner(System.in);
      
       final char SIDE_SYMB = '-';
       final char MID_SYMB = '*';
      
       //Start setting values for pyramid
       String inputStr = "";
       char choice = ' ';
       int numSymbols = -1, sideWidth = -1, midWidth = -1;
      
       do {
           System.out.print("Please enter your selection");   
           System.out.print("'r' Print a row of symbols");
           System.out.print("'p' Print out a pyramid");
           System.out.print("'q' Quit program");
           inputStr = scanner.nextLine();
           if (inputStr.length() > 0) {
               choice = inputStr.charAt(0); }
           else { choice = ' '; }
          
           //Set up the switch
           switch (choice) {
          
           //Code for the row output
           case 'r':
           System.out.println("Width of the sides?");
           sideWidth = scanner.nextInt();
           System.out.println("Width of the middle?");
           midWidth = scanner.nextInt();
           scanner.nextLine();
          
           case 'p':
               System.out.println("Number of symbols on the lowest layer?");
               numSymbols = scanner.nextInt();   
               scanner.nextLine();
               // Flush junk newline symbols
               System.out.println();
               System.out.println(buildPyramid(SIDE_SYMB, MID_SYMB, numSymbols));
               break;

           case 'q':
               System.out.println("Bye");
               break;
           //Send code back to the top  
           default:
                   System.out.println("Please choose a valid option from the menu.");
                                               }
          
private static
String buildRow(char sideSymb, int sideWidth, char midSymb, int midWidth){
String result = "";

for (int i = 0; i < sideWidth; i++){
result += sideSymb; }

for (int i = 0; i < midWidth; i++) {
result += midSymb; }

return result;}

                  
                  
//Separate code for building pyramid shape                  
private static
   String buildPyramid(char sideSymb, char midSymb, int numSymbols) {
   String result = "";
   int totalSymbOneRow = numSymbols;
   for (int numStars = 1; numStars <= numSymbols; numStars += 2)   
   {int numDashed = (totalSymbOneRow - numStars) / 2;   
   String buildRow(char sideSymb, char numDashed, char midSymb, numStars);
                   result += row + "\n"; }
                   return result;
   }
}

the goal of the code is to get a diamond and a row output with a size rhat depends on user input. I am getting error codes thrown at me at fhe bottom of the code and do not know where rhey are coming from. if you input the code unto the JAVA 2019-20 platform yiu shiuld see the 2 red X logos and the one lightbulb with a red X at the bottom of the code.

Answer 1

import java.util.*;
public class RandomNum {
   public static void main(String[] args) {
   // TODO Auto-generated method stub
  
   //start the scanner
   Scanner scanner = new Scanner(System.in);
  
   final char SIDE_SYMB = '-';
   final char MID_SYMB = '*';
  
   //Start setting values for pyramid
   String inputStr = "";
   char choice = ' ';
   int numSymbols = -1, sideWidth = -1, midWidth = -1;
  
   do {
   System.out.print("Please enter your selection");   
   System.out.print("'r' Print a row of symbols");
   System.out.print("'p' Print out a pyramid");
   System.out.print("'q' Quit program");
   inputStr = scanner.nextLine();
   if (inputStr.length() > 0) {
   choice = inputStr.charAt(0); }
   else { choice = ' '; }
  
   //Set up the switch
   switch (choice)
   {
  
   //Code for the row output
   case 'r':
   System.out.println("Width of the sides?");
   sideWidth = scanner.nextInt();
   System.out.println("Width of the middle?");
   midWidth = scanner.nextInt();
   scanner.nextLine();
   // break;
   case 'p':
   System.out.println("Number of symbols on the lowest layer?");
   numSymbols = scanner.nextInt();   
   scanner.nextLine();
   // Flush junk newline symbols
   System.out.println();
   System.out.println(buildPyramid(SIDE_SYMB, MID_SYMB, numSymbols));
   break;

   case 'q':
   System.out.println("Bye");
   break;
   }
   //Send code back to the top
   // default:
   // System.out.println("Please choose a valid option from the menu.");
   }while(choice=='q');   
   }   
   private static String buildRow(char sideSymb, int sideWidth, char midSymb, int midWidth)
   {
   String result = "";

   for (int i = 0; i < sideWidth; i++){
   result += sideSymb; }

   for (int i = 0; i < midWidth; i++) {
   result += midSymb; }

   return result;

   }   
  
   //Separate code for building pyramid shape
   public static String buildPyramid(char sideSymb, char midSymb, int numSymbols)
   {
   String result = "";
   int totalSymbOneRow = numSymbols;
   for (int numStars = 1; numStars <= numSymbols; numStars += 2)   
   {
       int numDashed = (totalSymbOneRow - numStars) / 2;   
   String row=buildRow(sideSymb,numDashed, midSymb,numStars);//function call does not need datatypes
   result += row + "\n";
   }
   return result;
   }
  

}