Model

• Domain  specific representation of the data
• Domain logic adds meaning to raw data
• When a model changes its state, it notifies its associated views so they can refresh.
• Model encapculate storage mechanism
• Models are not data access objects
• Model knows how to persist itself.

View

• Renders the model into a form suitable for interaction
• a user interface element.
• Multiple views can exist for a single model for different purposes.

Controller

• Receives input and initiates a response by making calls on model objects.
• An MVC application may be a collection of model/view/controller triplets, each responsible for a different UI element.

a (preprocessor directive) instruction to the compiler to include another file in program code before compiling

using namespace std;

Says that all the program statements that follow are within the std namespace.

The 2 statements cause a linefeed to be inserted into the stream (ending line)but endl (unlike ‘\n’) also causes the output buffer to be flushed.

Escape Sequences

Simple code example:

#include <iostream>

using namespace std;

int main()

   {

   int ftemp;  //for temperature in fahrenheit

   cout << “Enter temperature in fahrenheit: “;

   cin >> ftemp;

   int ctemp = (ftemp-32) * 5 / 9;

   cout << “Equivalent in Celsius is: “ << ctemp << ‘\n’;

   return 0;

   }

The setw Manipulator :

changes the field width of output. The value is right-justified within the field

// width2.cpp
// demonstrates setw manipulator
#include <iostream>
#include <iomanip>     // for setw
using namespace std;
 
int main()
   {
   long pop1=2425785, pop2=47, pop3=9761;
 
   cout << setw(8) << “LOCATION” << setw(12)
        << “POPULATION” << endl
        << setw(8) << “Portcity” << setw(12) << pop1 << endl
        << setw(8) << “Hightown” << setw(12) << pop2 << endl
        << setw(8) << “Lowville” << setw(12) << pop3 << endl;
   return 0;
   }


Output:

LOCATION  POPULATION
Portcity     2425785
Hightown          47
Lowville        9761