// ------------------------------------------------------------
 //   hello.cpp
 // ------------------------------------------------------------

#include <iostream.h>        // Stream library
#include <conio.h>           // Console i/o library
#include <math.h>            // Math library

 // --------------------------------------------------------

	  char QUIT = 0;   // global variable

	  void wait();     // declaration of two functions

	  double sqr(double x);

 // --------------------------------------------------------
 // Main progam

 void main ()
  {
	cout << " ------------------------- \n";
	cout << "   Welcome to hello.cpp\n";
	cout << " ------------------------- \n\n";

	int i;      // declare
	i = 1;      // assign a value

	int j = 3;  // one step

	int k(5);   // by casting

	cout << "   i = " << i << "    j = " << j << "   k = " <<  k <<"\n\n";

	double x,y;
	x = y = 0;


	x = 3;
	y = sqr(x);

	cout << "   sqr(" << x << ") = " << y << "\n\n";

	x = 3.14159/4;
	y = sin(x);

	cout << "   sin(" << x << ") = " << y << "\n\n";

   wait();

	if (QUIT) cout << "   QUIT = 1";
	else      cout << "   QUIT = 0";

	}

 // ---------------------------------------------------------
 // definitions (implementations)

	double sqr(double x) { return x*x; }

	void wait()
	 { QUIT = 0; char q = getch(); if (q == 'q') QUIT = 1; }

 // ---------------------------------------------------------
 /* output

 -------------------------
   Welcome to hello.cpp
 -------------------------

   i = 1    j = 3   k = 5

   sqr(3) = 9

   sin(0.785397) = 0.707106

 */