/*
* Computes the tax due based on a tax table.
* Pre : salary is defined.
* Post: Returns the tax due for 0.0 <= salary <= 150,000.00;
* returns -1.0 if salary is outside the table range.
*/
#include <stdio.h>
double
comp_tax(double salary)
{
double tax;
if (salary < 0.0)
tax = -1.0;
else if (salary < 15000.00) /* first range */
tax = 0.15 * salary;
else if (salary < 30000.00) /* second range */
tax = (salary - 15000.00) * 0.18 + 2250.00;
else if (salary < 50000.00) /* third range */
tax = (salary - 30000.00) * 0.22 + 5400.00;
else if (salary < 80000.00) /* fourth range */
tax = (salary - 50000.00) * 0.27 + 11000.00;
else if (salary <= 150000.00) /* fifth range */
tax = (salary - 80000.00) * 0.33 + 21600.00;
else
tax = -1.0;
return (tax);
}
int
main (void)
{
double income;
printf ("Enter the income > ");
scanf ("%lf", &income);
printf ("The income tax due is %0.2lf.\n", comp_tax (income));
return (0);
}
