C++ Compiling Your First Code

These will be the fundamental  examples for CFD

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Example 1

// my first program in C++
 #include <iostream> 
 int main() {
 std::cout << "Welcome to the CFD Programming World!";
 }

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Example 2

#include <iostream>
using namespace std;

const double R = 8.314;
const char newline = '\n';

int main ()
{
  double MU=29.0;               // Air Gas Constant
  double Gas_Constant;

  Gas_Constant = R/MU;
  cout << Gas_Constant;
  cout << newline;
}

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Example 3

// assignment operator
#include <iostream>
using namespace std;

int main ()
{
  int dx, dy;         // dx:?,  dy:?
  dx = 10;           // dx:10, dy:?
  dy = 4;            // dx:10, dy:4
  dx = dy;            // dx:4,  dy:4
  dy= 7;            // dx:4,  dy:7

  cout << "dx:";
  cout << dx;
  cout << " dy:";
  cout << dy;
}

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Example 4

#include <iostream>
using namespace std;

int main ()
{
  double N;
  double L;
  double dx;
  cout << "Please enter the number of grid points: ";
  cin >> N;
  cout << "The number of grid points you entered is " << N;
  cout << "  Please enter the Length Segment: ";
  cin >> L;
  cout << "The Length of the Segment you entered is " << L;
  dx = L/N;
  cout << " The discrete element size is " << dx;
}

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