incometaxcalculator.cpp

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// Tutorial 9: IncomeTaxCalculator.cpp
// Calculates a person's Federal income tax
// depending on that person's salary.
#include <iostream> // required to perform C++ stream I/O
#include <iomanip>  // required for parameterized stream manipulators

using namespace std; // for accessing C++ Standard Library members

// function main begins program execution
int main()
{
   // define variables
   double taxRate; // tax rate
   double salary;  // yearly salary

   // prompt user for and input yearly salary
   cout << "\nEnter yearly salary: ";
   cin >> salary; // get yearly salary

   // ensure that the user entered a value greater than zero
   if ( salary > 0.0 )
   {
      // determine appropriate tax rate based on yearly salary
      switch ( static_cast< int > ( salary ) / 25000 )
      {
         case 0: // yearly salary under $25,000
            taxRate = 0.15; // 15% tax rate
            break;

         case 1: // yearly salary in range $25,000-49,999
         case 2: // yearly salary in range $50,000-74,999
            taxRate = 0.25; // 25% tax rate
            break; 

         case 3: // yearly salary in range $75,000-99,999
         case 4: // yearly salary in range $100,000-124,999
         case 5: // yearly salary in range $125,000-149,999
            taxRate = 0.28; // 28% tax rate
            break; 

         case 6:  // yearly salary in range $150,000-174,999
         case 7:  // yearly salary in range $175,000-199,999
         case 8:  // yearly salary in range $200,000-224,999
         case 9:  // yearly salary in range $225,000-249,999
         case 10: // yearly salary in range $250,000-274,999
         case 11: // yearly salary in range $275,000-299,999
            taxRate = 0.33; // 33% tax rate
            break;

         default: // yearly salary $300,000 or higher
            taxRate = 0.35; // 35% tax rate

      } // end switch

      double incomeTax = salary * taxRate; // calculate taxes

      // display income tax
      cout << "\nIncome tax: $" << fixed << setprecision( 2 )
           << incomeTax << endl;
   } // end if
   else // display error message
   {
      cout << "\nError: Income must be greater than 0" << endl;
   } // end else

   cout << "\n";

   return 0; // indicate that program ended successfully

} // end function main


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