Question

In each of the projects that follow, you should write a program that contains an introductory docstring. This documentation should describe what the program will do (analysis) and how it will do it (design the program in the form of a pseudocode algorithm). Include suitable prompts for all inputs, and label all outputs appropri- ately. After you have coded a program, be sure to test it with a reasonable set of legitimate inputs. 1 The tax calculator program of the case study outputs a floating-point number that might show more than two digits of precision. Use the round function to modify the program to display at most two digits of precision in the output number.

Answer 1

/*Java program that prompts the user to enter sales amount from the user and then finds the 5% sales tax on sales amount. Then print the sales and tax amount on sales . Print two decimal places for tax amount on sales. * */
//TaxCalculator.java
import java.util.Scanner;
public class TaxCalculator
{
   public static void main(String[] args)
   {
       //declare sales as double data type
       double sales;
       //set initial sales as 0
       sales=0;
       //initialize the tax value as 5%
       final double TAX=0.05;
      
       //create an instance of Scanner class
       Scanner scanner=new Scanner(System.in);
       //Prompt user to enter sales amount
       System.out.print("Enter sales :$ ");
       //read sales as string and convert to double
       sales=Double.parseDouble(scanner.nextLine());
      
       //calculate the tax on sales
       double taxamount=sales*TAX;
      
       System.out.println("Sales : $"+sales);
       //round the tax amount to 2 decimal places
       System.out.println("Tax amount: $"+Math.round(taxamount*100)/100.0);  
   }
}//end of the class

Sample Output:

Enter sales :$ 5869
Sales : $5869.0
Tax amount: $293.45

Note: Program is assumed to write in java language.