INTRO JAVA - AREA OF TRIANGLE - CH. 5 TONY GADDIS'S STARTING OUT W/ JAVA (6TH ED.)

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SOME OF THE CODE:

/** You must complete this program so it calculates and displays the area of a rectangle. */ // Insert any necessary import statements here. public class AreaRectangle { public static void main(String[] args) { double length, // The rectangle's length width, // The rectangle's width area; // The rectangle's area // Get the rectangle's length from the user. length = getLength(); // Get the rectangle's width from the user. width = getWidth(); // Get the rectangle's area. area = getArea(length, width); // Display the rectangle data. displayData(length, width, area); } } 

l the item's retail price is 10.00. ulator oblem f a n item's wholesale cost is 5.00 and its markup percentage is 50 percent, then item's retail price is 7.50. e program should have a method named calculateRetail that receives the wholesale cost and Th th e markup percentage as arguments, and returns the retail price of the item 3. Rectangle Area- Complete the Program f you h ave downloaded the book's source code from www.pearsonhighered.com/gaddis, ectangle, and then display the rectan- o getlength-This method should ask the user to enter the rectangle's length, and then n program named AreaRectangle.java in this chapter's . When it is complete, the program you will find a partially writte source code folder. Your job is to complete the program will ask the user to enter the width and length of a gle's area. The progranm rea. The program calls the following methods, which have not been written return that value as a double. return that value as a double. o getWidth- This method should ask the user to enter the rectangle's width, and then o getArea This method should accept the rectangle's length and width as arguments, and rn the rectangle's area. The area is calculated by multiplying the length by the width yData-This method should accept the rectangle's length, width, and area as rguments, and display them in an appropriate message on the screen 4. Paint Job Estimator A painting company has determined that for every 115 square f of paint for labor. Write a prog eet of wall space, one gallon and eight hours of labor will be required. The company charges $18.00 per hour ram that allows the user to enter the number of room t