$6\mathrm{.}23$ Java example: Salary calculation with methods

zyDE $6\mathrm{.}23\mathrm{.}1$: Calculate salary: Using methods.

Separating calculations into methods simplifies modifying and expanding programs.

The following program calculates the tax rate and tax to pay, using methods. One method returns a tax rate based on an annual salary.

$1.$ Run the program below with annual salaries of $40000,60000,$ and $0.$

$2.$ Change the program to use a method to input the annual salary.

$3.$ Run the program again with the same annual salaries as above. Are results the same?

Note: The calculation is inaccurate to how taxes are formally assessed and is a simplification for educational purposes only.

$```$

Load default template...

$38\backslash /$ FIXME: Change the input to come from a method

annualSalary $=$ scnr$.$nextInt$()$;

while $($annualSalary $>0)\{$

taxRate $=$ getCorrespondingTableValue$($annualSalary$,$ salaryBase, taxBase$)$;

taxToPay$=($int$)($annualSalary $*$ taxRate$)$; $//$ Truncate tax to an integer amount

System.out.println$("$Annual salary: $"+$ annualSalary $+$

$"\backslash$tTax rate: $"+$ taxRate $+$

$"\backslash$tTax to pay: $"+$ taxToPay$)$;

$//$ Get the next annual salary

$//$ FIXME: Change the input to come from a method

System.out.println$("$

Enter annual salary $(0$ to exit$)$: $")$;

annualSalary $=$ scnr$-$nextInt$()$;

$\}$

$57$

$40000600000$

$```$