//
// Example 4.11. Interactive program to compute the raise of
// a salaried employee. Those that earn less than $2000 a
// month get a raise of $150 a month, and those with
// salaries between $2000 and $5000 a month receive a raise
// of $250 a month.
//

#include <iostream>

using namespace std;

int main()
{
   void instructions();		// prototypes
   int  readSalary();
   bool outOfRange(int salary);
   int  newSalary(int salary);

   int salary;                  // monthly salary
   
   instructions();
   salary = readSalary();
   if (outOfRange(salary))
      cout << endl << "That salary is out of range" << endl;
   else
      cout << endl << "The new salary is " << newSalary(salary) << endl;

   return 0;
}

//
// Function to print instructions on what the program does
// Pre:  none
// Post: Instructions have been displayed.
//

void instructions()
{
   cout << "This program interactively reads a monthly salary" << endl;
   cout << "and computes a new monthly salary. If the salary" << endl;
   cout << "is less than $2000 a month, the raise is $150 a month." << endl;
   cout << "If the salary is between $2000 and $5000 a month," << endl;
   cout << "the raise is $250 a month." << endl << endl;
}

//
// Function to read a salary interactively
// Pre:  none
// Post: The salary the user entered has been returned.
//

int readSalary()
{
   int salary;                // monthly salary

   cout << "Type a monthly salary between $0 and $5000." << endl;
   cout << "Do not use the dollar sign or commas. ";
   cin  >> salary;

   return salary;
}

//
// Function to return true if salary is out of range
// Range: $0 - $5000
// Pre:   salary is an integer.
// Post:  true has been returned if salary
//        is not in range; false if it is.
//

bool outOfRange(int salary)
{
   return ((salary < 0) || (salary > 5000));
}

//
// Function to return new salary. For salaries < $2000,
// raise is $150; for salaries between $2000 and $5000,
// raise is $250
// Pre:  salary is an integer between 0 and 5000.
// Post: The modified salary (previous salary + raise)
//       has been returned.
//

int newSalary(int salary)
{
   int raise;           // monthly raise in salary

   if (salary < 2000)
      raise = 150;
   else
      raise = 250;

   return (salary + raise);
}