Job Ready Java

Lesson 6Pulling It All Together: Building a Useful Program

Now, let's pull everything we've learned together and build our first useful program. The purpose of the program is to calculate the total cost for home replacement windows. Here are the requirements:

PROGRAM OBJECTIVES

• Must prompt the user for the height of the window (in feet).
• Must prompt the user for the width of the window (in feet).
• Must calculate and display the area of the window.
• Must calculate and display the perimeter of the window.
• Based on the area and perimeter, it must calculate the total cost of the window.
  • The glass for the windows costs $3.50 per square foot.
  • The trim for the windows costs $2.25 per linear foot.

PLANNING THE PROGRAM

Before you boot up your IDE and start to write the code, you should always take time to plan any program you will write. This includes identifying any variables your program will need and how the variables are related to each other, as well as using pseudocode or a flowchart (or both) to identify the steps your program will need to complete.

NOTE

If you haven't worked with flowcharts before, don't fret! You'll learn more about creating a flowchart in Lesson 9, “Understanding Flowcharts and Algorithms.”

Identifying the Variables

Looking through the requirements list, we will need the following variables:

• String variable for height (read from console)
• String variable for width (read from console)
• Float variable for height (converted from string; use ...