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

	 extern 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

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

#endif