// ------------------------------------------------------------
 //  w0.h   base, and text output functions All C++
 // ------------------------------------------------------------
 /*

	NB This is w.h with the definitions of ftab and roll removed:
		the completion of these functions are exercises.

	Base section has definitions we always use
	Simplify by not using a text win class
	Keep all code generic
	Combine declarations and definitions in one file:
	hence ifndef-define-endif wraps this whole file.
 */
#ifndef w_h
#define w_h
// ------------------------------------------------------------------
// top-level functions
#ifndef fptype_1
#define fptype_1
	typedef double (*fptype1)( double);
#endif

#ifndef fptype_2
#define fptype_2
	typedef double (*fptype2)( double,double);
#endif

#ifndef fptype_3
#define fptype_3
	typedef double (*fptype3)( double,double,double);
#endif
// -----------------------------------------------------------------
//  the fun function classes
#ifndef fun_1
#define fun_1
	class fun
	  { public: virtual double f(double) = 0; };
#endif

#ifndef fun_2
#define fun_2
	class fun2
	  { public: virtual double f(double, double) = 0; };
#endif

#ifndef fun_3
#define fun_3
	class fun3
	  { public: virtual double f(double, double, double) = 0; };
#endif

// ---------------------------------------------------------------------
// our usual selection of libraries
#include <iostream.h>        // Stream library
#include <conio.h>           // Console i/o library
#include <stdio.h>           // for gets
#include <stdlib.h>          // for atoi
#include <stdarg.h>          // for format strings
#include <string.h>          // string library
#include <math.h>            // Math library


// some global constants (defined later)
 const extern double Pi;
 const extern double Piby2;
 const extern double Piby4;
 const extern double Piby180;
 const extern double Exp1;


 // some global functions

	 int QUIT;    // 1 or 0
	 void wait(); // wait for key press 'q' -> quit = 1


	 int roll(int i, int n, int di = 1);
	 // di cyclic perms of 1..n starting at i

	 double fid(double x);  // functional identity
	 double sqr(double x);

 // ------------------------------------------------------
 // io functions


 void nl(int dn = 1);  // new line(s)
 void p(char *s);      // print s to current position
 void pl(char *s);     // print s with new line
 void p(double x);     // print x to current position
 void pl(double x);    // print x with new line
 void p(char *s,double x); // print s x
 void pl(char*s,double x); // print s x
 void banner(char *s);     // print banner
 void pf(char *fmt, ...);  // p formatted data
 void pfl(char *fmt, ...); // p formatted data with nl
 void r(char *s);          // read string s, and nl
 void r(double &x);        // read string s, x = atof(s)
 void r(char *s, double &x);
 void ftab(fptype1 f, char *fs, // tabulate x f(x)
			  double xa, double xb, int nx);
 void ftab(fun *f, char *fs, // tabulate x f(x)
				double xa, double xb, int nx);

 void precision(int n);    // sets cout precision

// ------------------------------------------------------------
//   w.cpp  definitions (implementations)
// ------------------------------------------------------------

const double Pi      = 3.1415926535897932;
const double Piby2   = 1.5707963267948966;
const double Piby4   = 0.7853981633974483;
const double Piby180 = 1.7453292519943296e-2;
const double Exp1    = 2.7182818284590452;
char *MARGSTR = "   ";
char *TABSTR = "%s(%10.6f) = %12.6f";

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

	 void wait()
	  { char c;
		 c = getc(stdin);
		 if (c == 'q') QUIT = 1;
		 else QUIT = 0; }
		 


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

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

		void nl(int dn)
			{ for (int i = 0; i < dn; i++) cout << "\n";
			  cout << MARGSTR; cout.flush(); }

		void p(char *s)
		  {  cout << s;}

		void pl(char *s)
		  { p(s); nl(); }
   
		void p(double x)
		  { cout << x; }
			
		void pl(double x)
		  { p(x); nl(); }

		void p(char *s,double x)
			{ p(s); p(x); }

		void pl(char*s,double x)
		  { p(s); pl(x); }

		void banner(char *s)
		  { int len = strlen(s)+2,i;
          for (i = 0; i < len; i++) p("-"); nl();
			 p(" "); pl(s);
			 for (i = 0; i < len; i++) p("-"); nl(); }

		void setmarg(char *m)
		  { strcpy(MARGSTR,m); }

		void pf(char *fmt, ...)  // p for formatted data
		  { char s[80];
			 va_list argptr;
			 va_start(argptr, fmt);
			 vsprintf(s,fmt, argptr);
			 va_end(argptr);
			 p(s); }

		 void pfl(char *fmt, ...)  //  .. and nl
		  {
			char s[80];
			va_list argptr;
			va_start(argptr, fmt);
			vsprintf(s,fmt, argptr);
			va_end(argptr);
			p(s); nl();}

			void r(char* s)  // read a string into s
			 { gets(s); }

			 void r(double &x)
			 { char s[80];
				gets(s);
				x = atof(s);
           }

			 void r(char *s, double &x)
			 { p(s); r(x); nl(); }

			 
        
			void precision(int n = 7)
			  { cout.precision(n); } // call iostream fun
			

 // -----------------------------------------------------------
#endif