Question

Program: Drawing a half arrow (Java)

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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)

Answer 1

code

import java.util.Scanner;
import java.lang.Math;
public class HalfArrow {
private int arrowBaseHeight;//create arrowBaseHeight data member
private int arrowBaseWidth;//create arrowBaseWidth data member
private int arrowHeadWidth;//create arrowHeadWidth data member
public static Scanner sc=new Scanner(System.in);//create scanner object to scan object
//setters
public void setArrowBaseHeight(int bh)
{
arrowBaseHeight=bh;
}
public void setArrowBaseWidth(int wh)
{
arrowBaseWidth=wh;
}
public void setArrowHeadWidth(int hw)
{
do
{//if head width is greater than base width then only accept it
if(hw>arrowBaseWidth)
{
arrowHeadWidth=hw;
break;
}
//otherwise ask user until he/she inputs no. greater than base width
System.out.println("Please enter arrow head width greater than arrow base width");
hw=sc.nextInt();
}while(true);

}
//draw rectangle
public void drawRectangle()
{
for(int i=0;i<arrowBaseHeight;i++)//draw for arrowBaseHeight height
{
for(int j=0;j<arrowBaseWidth;j++)
{
System.out.print("*");//print * arrowBaseWidth times
}
System.out.println();//new line
}
}
public void drawTriangle()
{
int x,y,spaces;
//as this trianle is right angle then by applying tan formula height comes out to be arrowHeadWidth/2
for(int i=0;i<arrowHeadWidth/2;i++)
{
// for i as row we print arrayHeadWidth/power(2,i) *'s
/*and total spaces before and after stars would be no. of stars printed in first row - no. of stars printed in current row but that is total spaces so divide it by 2 to get space which comes before stars.*/
x=(int)Math.pow(2,i);
y=arrowHeadWidth/x;
spaces=(arrowHeadWidth-y)/2;
for(int j=0;j<spaces;j++)
{
System.out.print(" ");//print spaces
}
for(int j=0;j<y;j++)
{
System.out.print("*");//print stars
}
System.out.println();
}
}
public static void main(String args[])
{
HalfArrow arr=new HalfArrow();//create object
System.out.println("Please enter arrow base width");
int bw=sc.nextInt();//take base width input
arr.setArrowBaseWidth(bw);
System.out.println("Please enter arrow base height");
arr.setArrowBaseHeight(sc.nextInt());//set base height
System.out.println("Please enter arrow head width");
arr.setArrowHeadWidth(sc.nextInt());//set head width
//as it is downfacing so first print rectangle then triangle
arr.drawRectangle();//draw rectangle
arr.drawTriangle();//draw triangle
}
}