#include <iostream>

using namespace std;

int main()
{
  int num1 = 1234, num2 = 5678;
  cout << endl; //Start on a new line
  cout << num1 << num2; //Output two values
  cout << endl; //End on a new line
  return 0; //Exit program
}

#include <iostream>

using namespace std;

int main()
{
  int apples, oranges; // Declare two integer variables
  int fruit; // ...then another one

  apples = 5; oranges = 6; // Set initial values
  fruit = apples + oranges; // Get the total fruit

  cout << endl; // Start output on a new line
  cout << "Oranges are not the only fruit... " << endl
       << "- and we have " << fruit << " fruits in all.";
  cout << endl; // Start output on a new line

  return 0; // Exit the program
}

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
  int num1 = 1234, num2 = 5678;
  cout << endl; //Start on a new line
  cout << setw(6) << num1 << setw(6) << num2; //Output two values
  cout << endl; //Start on a new line
  return 0; //Exit program
}

// Calculating how many rolls of wallpaper are required for a room
#include <iostream>

using namespace std;

int main()
{
  double height = 0.0, width = 0.0, length = 0.0; 
  // Room dimensions
  double perimeter = 0.0; // Room perimeter

  const double rollwidth =21.0; // Standard roll width
  const double rolllength = 12.*33.; // Standard roll length(33ft.)

  int strips_per_roll = 0; // Number of strips in a roll
  int strips_reqd = 0; // Number of strips needed
  int nrolls = 0; // Total number of rolls

  cout << endl // Start a new line
       << "Enter the height of the room in inches: ";
  cin >> height;

  cout << endl // Start a new line
       << "Now enter the length and width in inches: ";
  cin >> length >> width;

  strips_per_roll = rolllength/height; 
  // Get number of strips in a roll
  perimeter = 2.0*(length + width); // Calculate room perimeter
  strips_reqd = perimeter/rollwidth; // Get total strips required
  nrolls = strips_reqd/strips_per_roll; 
  // Calculate number of rolls

  cout << endl
       << "For your room you need " << nrolls 
       << " rolls of wallpaper."
       << endl;

  return 0;
}

#include <iostream>

using namespace std;

int main()
{
  long num1 = 0, num2 = 0, num3 = 0, num4 = 0;

  num4 = (num1 = 10, num2 = 20, num3 = 30);
  cout << endl
       << "The value of a series of expressions "
       << "is the value of the right most: "
       << num4;
  cout << endl;

  return 0;
}

// Demonstrating variable scope
#include <iostream>

using namespace std;

int main()
{ // Function scope starts here
  int count1 = 10;
  int count3 = 50;
  cout << endl
       << "Value of outer count1 = " << count1 
       << endl;

  { // New scope starts here...
    int count1 = 20; // This hides the outer count1
    int count2 = 30;
    cout << "Value of inner count1 = " << count1
         << endl;
    count1 += 3; // This affects the inner count1
    count3 += count2;
  } // ...and ends here

  cout << "Value of outer count1 = " << count1
       << endl
       << "Value of outer count3 = " << count3
       << endl;

// cout << count2 << endl; // uncomment to get an error

  return 0;
} // Function scope ends here

// Demonstrating variable scope
#include <iostream>

using namespace std;

int count1 = 100; // Global version of count1

int main()
{ // Function scope starts here
  int count1 = 10;
  int count3 = 50;
  cout << endl
       << "Value of outer count1 = " << count1
       << endl;
  cout << "Value of global count1 = " << ::count1 
  // From outer block
       << endl;

  { // New scope starts here...
    int count1 = 20; //This hides the outer count1
    int count2 = 30;
    cout << "Value of inner count1 = " << count1
         << endl;
    cout << "Value of global count1 = " << ::count1 
    // From inner block
         << endl;

    count1 += 3; // This affects the inner count1
    count3 += count2;
  } // ...and ends here.

  cout << "Value of outer count1 = " << count1
       << endl
       << "Value of outer count3 = " << count3
       << endl;

//cout << count2 << endl; // uncomment to get an error

  return 0;
} // Function scope ends here

// Demonstrating namespace names
#include <iostream>

int value = 0;

int main()
{
  std::cout << "enter an integer: ";
  std::cin >> value;
  std::cout << "\nYou entered " << value
            << std::endl;

  return 0;
}

// Declaring a namespace
#include <iostream>

namespace myStuff
{
  int value = 0;
}

int main()
{
  std::cout << "enter an integer: ";
  std::cin >> myStuff::value;
  std::cout << "\nYou entered " << myStuff::value
            << std::endl;

  return 0;
}

#include <iostream>

namespace myStuff
{
  int value = 0;
}

using namespace myStuff;

int main()
{
  std::cout << "enter an integer: ";
  std::cin >> value;
  std::cout << "\nYou entered " << value
            << std::endl;

  return 0;
}