[user02@FC4 Lesson06]$ cat -n mathvars.cpp

   1  #include <iostream>
   2  using namespace std;
   3
   4  int main()
   5  {
   6     float cost = 15.50;         // The cost of an item
   7     float sales_tax = 0.06;     // Sales tax is 6 percent
   8     float amount_paid = 20.00;  // The amount the buyer paid
   9     float tax, change, total;   // Sales tax, buyer change and
  10                                 // total bill
  11
  12     tax = cost * sales_tax;
  13     total = cost + tax;
  14     change = amount_paid - total;
  15
  16     cout << "Item Cost: $" << cost << "\tTax: $" << tax << "\tTotal: $" << total << endl;
  17
  18     cout << "Customer change: $" << change << endl;
  19
  20     return 0;
  21  }

[user02@FC4 Lesson06]$ g++ -o mathvars mathvars.cpp
[user02@FC4 Lesson06]$ ./mathvars
Item Cost: $15.5 Tax: $0.93 Total: $16.43
Customer change: $3.57