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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Hi I am having some difficulties with this problem, I am not sure why my code is giving an incorrect output.

Here is the provided code:

import java.util.Scanner;

public class DrawHalfArrow {
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
int arrowBaseHeight;
int arrowBaseWidth;
int arrowHeadWidth;

System.out.println("Enter arrow base height:");
arrowBaseHeight = scnr.nextInt();

System.out.println("Enter arrow base width:");
arrowBaseWidth = scnr.nextInt();

System.out.println("Enter arrow head width:");
arrowHeadWidth = scnr.nextInt();
System.out.println("");

// Draw arrow base (height = 3, width = 2)
System.out.println("**");
System.out.println("**");
System.out.println("**");

// Draw arrow head (width = 4)
System.out.println("****");
System.out.println("***");
System.out.println("**");
System.out.println("*");
}
}

Here is my code:

import java.util.Scanner;

public class DrawHalfArrow {

public static void main(String[] args) {

//declare variables of integer type

int baseHeight;

int baseWidth;

int headWidth;

//Scanner class object

Scanner console=new Scanner(System.in);

//height, width and head width

System.out.println("Enter arrow base height:");

baseHeight=Integer.parseInt(console.nextLine());

System.out.println("Enter arrow base width:");

baseWidth=Integer.parseInt(console.nextLine());

System.out.println("Enter arrow head width:");

headWidth=Integer.parseInt(console.nextLine());

//arrow tail

for (int i = 0; i < baseHeight; i++)

{

for (int j = 0; j < baseWidth; j++)

{

System.out.printf("*");

}

System.out.println();

}

//print arrow head

for (int i = headWidth; i>=1; i--)

{

for (int j = i; j >=1 ; j--)

{

System.out.print("*");

}

System.out.println();

}

Thanks!

This program outputs a downwards facing arrow composed of a rectangle and a right triangle. The arrow dimensions are defined by user
specified arrow base height, arrow base width, and arrow head width.
(1) Modify the given program to use a loop to output an arrow base of height arrowBaseHeight. (1 pt)
(2) Modify the given program to use a loop to output an arrow base of width arrowBaseWidth. Use a nested loop in which the inner loop
draws the *'s, and the outer loop iterates a number of times equal to the height of the arrow base. (1 pt)
(3) Modify the given program to use a loop to output an arrow head of width arrowHeadWidth. Use a nested loop in which the inner loop
draws the *'s, and the outer loop iterates a number of times equal to the height of the arrow head. (2 pts)
(4) Modify the given program to only accept an arrow head width that is larger than the arrow base width. Use a loop to continue prompting
the user for an arrow head width until the value is larger than the arrow base width. (1 pt)
while (arrowHeadWidth <= arrowBaseWidth) {
// Prompt user for a valid arrow head value

Example output for arrowBaseHeight = 5, arrowBaseWidth = 2, and arrowHeadWidth = 4:
Enter arrow base height:
Enter arrow base width:
Enter arrow head width:
4
**
**
**
**
****
***
**

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