#!/bin/sh
# This is a shar archive.
# The rest of this file is a shell script which will extract:
#
# 6_15h.h 6_15h1.h 6_15h10.h 6_15h11.h 6_15h12.h 6_15h13.h 6_15h14.h 6_15h15.h 6_15h16.h 6_15h17.h 6_15h18.h 6_15h19.h 6_15h2.h 6_15h20.h 6_15h21.h 6_15h3.h 6_15h4.h 6_15h5.h 6_15h6.h 6_15h7.h 6_15h8.h 6_15h9.h makefile tst.c tst.cmp vec4.h vec4all.h
#
# To extract the files from this shell archive file simply
# create a directory for this file, move the archive file
# to it and enter the command
#
#	sh filename
# 
# The files will be extracted automatically.
# Note: Do not use csh.
#
# Archive created: Mon Jul 30 23:06:28 EDT 1990
#
echo x - 6_15h.h
sed 's/^X//' > 6_15h.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
/*
	vector of four floats
	Exercise 6.15
*/
#ifndef VEC4_H
#define VEC4_H

# include <stream.h>

overload gauss;		// DELETE
#include "6_15h1.h"	// EXPAND class, vec4(), ~vec4()

				// vec4 x(0.,0.,0.,0.);
    vec4(float a, float b, float c, float d);

    vec4(vec4& a);		// vec4 x = y;
    vec4(float a);		// vec4 x = 35.;
    vec4(int a);		// vec4 x = 35;

    vec4 operator=(vec4 a);	// x = y;
    vec4 operator=(float a);	// x = 35.;

    // x = a + b, a - b, a * b, a / b, +a, -a
    friend vec4 operator+(vec4 a, vec4 b);
    friend vec4 operator-(vec4 a, vec4 b);
    friend vec4 operator*(vec4 a, vec4 b);
    friend vec4 operator/(vec4 a, vec4 b);
    friend vec4 operator+(vec4 a);
    friend vec4 operator-(vec4 a);

    vec4 operator+=(vec4 a);	// x += a
    vec4 operator-=(vec4 a);	// x -= a
    vec4 operator*=(vec4 a);	// x *= a
    vec4 operator/=(vec4 a);	// x /= a

    float& operator[](int i);	// f = a[i]

    // x = a == b, a != b
    friend int operator==(vec4 a, vec4 b);
    friend int operator!=(vec4 a, vec4 b);

				// cout << a
    friend ostream& operator<< (ostream& out, vec4 a);
    float dot(vec4 a);			// x = a.dot(b)
    friend class mat4;			// DELETE
    friend vec4 operator*(mat4, vec4);	// DELETE
    friend vec4 operator*(vec4, mat4);	// DELETE
    friend int gauss(mat4& a, mat4& b);	// DELETE
    friend int gauss(mat4& a, vec4& b);	// DELETE
};
#endif /* VEC4_H */
!EOF!
ls -l 6_15h.h
echo x - 6_15h1.h
sed 's/^X//' > 6_15h1.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
class vec4
{
    float f[4];

public:
    vec4()			// vec4 x; or new vec4;
    {
        f[0] = f[1] = f[2] = f[3] = 0;
    }

    ~vec4() {}			// delete vec4;
    // ...
!EOF!
ls -l 6_15h1.h
echo x - 6_15h10.h
sed 's/^X//' > 6_15h10.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = a / b
vec4 operator/(vec4 a, vec4 b)
{
    vec4 ret(a.f[0] / b.f[0],
	     a.f[1] / b.f[1],
	     a.f[2] / b.f[2],
	     a.f[3] / b.f[3]);
    return ret;
}
!EOF!
ls -l 6_15h10.h
echo x - 6_15h11.h
sed 's/^X//' > 6_15h11.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = +a
vec4 operator+(vec4 a)
{
    vec4 ret = a;
    return ret;
}
!EOF!
ls -l 6_15h11.h
echo x - 6_15h12.h
sed 's/^X//' > 6_15h12.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = -a
vec4 operator-(vec4 a)
{
    vec4 ret(-a.f[0], -a.f[1], -a.f[2], -a.f[3]);
    return ret;
}
!EOF!
ls -l 6_15h12.h
echo x - 6_15h13.h
sed 's/^X//' > 6_15h13.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x += a
vec4 vec4::operator+=(vec4 a)
{
    f[0] += a.f[0];
    f[1] += a.f[1];
    f[2] += a.f[2];
    f[3] += a.f[3];
    return *this;
}
!EOF!
ls -l 6_15h13.h
echo x - 6_15h14.h
sed 's/^X//' > 6_15h14.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x -= a
vec4 vec4::operator-=(vec4 a)
{
    f[0] -= a.f[0];
    f[1] -= a.f[1];
    f[2] -= a.f[2];
    f[3] -= a.f[3];
    return *this;
}
!EOF!
ls -l 6_15h14.h
echo x - 6_15h15.h
sed 's/^X//' > 6_15h15.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x *= a
vec4 vec4::operator*=(vec4 a)
{
    f[0] *= a.f[0];
    f[1] *= a.f[1];
    f[2] *= a.f[2];
    f[3] *= a.f[3];
    return *this;
}
!EOF!
ls -l 6_15h15.h
echo x - 6_15h16.h
sed 's/^X//' > 6_15h16.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x /= a
vec4 vec4::operator/=(vec4 a)
{
    f[0] /= a.f[0];
    f[1] /= a.f[1];
    f[2] /= a.f[2];
    f[3] /= a.f[3];
    return *this;
}
!EOF!
ls -l 6_15h16.h
echo x - 6_15h17.h
sed 's/^X//' > 6_15h17.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// f = a[i]
float& vec4::operator[](int i)
{
    return f[(i >= 0) && (i < 4) ? i : 0];
}
!EOF!
ls -l 6_15h17.h
echo x - 6_15h18.h
sed 's/^X//' > 6_15h18.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = (a == b)
int operator==(vec4 a, vec4 b)
{
    return (a.f[0] == b.f[0]) &&
	   (a.f[1] == b.f[1]) &&
	   (a.f[2] == b.f[2]) &&
	   (a.f[3] == b.f[3]);
}
!EOF!
ls -l 6_15h18.h
echo x - 6_15h19.h
sed 's/^X//' > 6_15h19.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = (a != b)
int operator!=(vec4 a, vec4 b)
{
    return (a.f[0] != b.f[0]) ||
	   (a.f[1] != b.f[1]) ||
	   (a.f[2] != b.f[2]) ||
	   (a.f[3] != b.f[3]);
}
!EOF!
ls -l 6_15h19.h
echo x - 6_15h2.h
sed 's/^X//' > 6_15h2.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
vec4::vec4(vec4& a)		// vec4 x = y;
{
    f[0] = a.f[0];
    f[1] = a.f[1];
    f[2] = a.f[2];
    f[3] = a.f[3];
}
!EOF!
ls -l 6_15h2.h
echo x - 6_15h20.h
sed 's/^X//' > 6_15h20.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// cout << a
ostream& operator<< (ostream& out, vec4 a)
{
    return out << "(" <<
	a.f[0] << "," <<
	a.f[1] << "," <<
	a.f[2] << "," <<
	a.f[3] << ")";
}
!EOF!
ls -l 6_15h20.h
echo x - 6_15h21.h
sed 's/^X//' > 6_15h21.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = a.dot(b)
float vec4::dot(vec4 a)
{
    return f[0] * a.f[0] + f[1] * a.f[1] +
	   f[2] * a.f[2] + f[3] * a.f[3];
}
!EOF!
ls -l 6_15h21.h
echo x - 6_15h3.h
sed 's/^X//' > 6_15h3.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
vec4::vec4(float a)		// vec4 x = 35.;
{
    f[0] = f[1] = f[2] = f[3] = a;
}

vec4::vec4(int a)		// vec4 x = 35;
{
    f[0] = f[1] = f[2] = f[3] = a;
}
!EOF!
ls -l 6_15h3.h
echo x - 6_15h4.h
sed 's/^X//' > 6_15h4.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// vec4 x(0.,0.,0.,0.);
vec4::vec4(float a, float b, float c, float d)
{
    f[0] = a;
    f[1] = b;
    f[2] = c;
    f[3] = d;
}
!EOF!
ls -l 6_15h4.h
echo x - 6_15h5.h
sed 's/^X//' > 6_15h5.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = y;
vec4 vec4::operator=(vec4 a)
{
    f[0] = a.f[0];
    f[1] = a.f[1];
    f[2] = a.f[2];
    f[3] = a.f[3];
    return *this;
}
!EOF!
ls -l 6_15h5.h
echo x - 6_15h6.h
sed 's/^X//' > 6_15h6.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = 35.;
vec4 vec4::operator=(float a)
{
    f[0] = f[1] = f[2] = f[3] = a;
    return *this;
}
!EOF!
ls -l 6_15h6.h
echo x - 6_15h7.h
sed 's/^X//' > 6_15h7.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = a + b
vec4 operator+(vec4 a, vec4 b)
{
    vec4 ret(a.f[0] + b.f[0],
	     a.f[1] + b.f[1],
	     a.f[2] + b.f[2],
	     a.f[3] + b.f[3]);
    return ret;
}
!EOF!
ls -l 6_15h7.h
echo x - 6_15h8.h
sed 's/^X//' > 6_15h8.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = a - b
vec4 operator-(vec4 a, vec4 b)
{
    vec4 ret(a.f[0] - b.f[0],
	     a.f[1] - b.f[1],
	     a.f[2] - b.f[2],
	     a.f[3] - b.f[3]);
    return ret;
}
!EOF!
ls -l 6_15h8.h
echo x - 6_15h9.h
sed 's/^X//' > 6_15h9.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// x = a * b
vec4 operator*(vec4 a, vec4 b)
{
    vec4 ret(a.f[0] * b.f[0],
	     a.f[1] * b.f[1],
	     a.f[2] * b.f[2],
	     a.f[3] * b.f[3]);
    return ret;
}
!EOF!
ls -l 6_15h9.h
echo x - makefile
sed 's/^X//' > makefile << '!EOF!'
CC= CC -I. -I../../CC
CFLAGS=

all: tst

tst: makefile tst.c	\
		6_15h1.h 6_15h2.h 6_15h3.h 6_15h4.h 6_15h5.h \
		6_15h6.h 6_15h7.h 6_15h8.h 6_15h9.h 6_15h10.h \
		6_15h11.h 6_15h12.h 6_15h13.h 6_15h14.h 6_15h15.h \
		6_15h16.h 6_15h17.h 6_15h18.h 6_15h19.h 6_15h20.h \
		6_15h21.h
	$(CC) $(CFLAGS) tst.c -o tst

CMP= tst.cmp
OUT= tst.out

tst.out: tst ;	tst > tst.out

test: all $(OUT) $(CMP)
	cmp tst.out tst.cmp
	echo tests done
!EOF!
ls -l makefile
echo x - tst.c
sed 's/^X//' > tst.c << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
#include "vec4.h"
#include "vec4all.h"

main()
{
    vec4 a, b = (float)1., c(4.,3.,2.,1.);
    cout << "init" << ", " << "a=" << a << "\n";
    cout << "init" << ", " << "b=" << b << "\n";
    cout << "init" << ", " << "c=" << c << "\n";
#if 1
    a=19.;
    cout << "a=19." << ", " << "a=" << a << "\n";
    a=c;
    cout << "a=c" << ", " << "a=" << a << "\n";
    a = b + c;
    cout << "a = b + c" << ", " << "a=" << a << "\n";
    cout << "b=" << b << "\n";
    cout << "c=" << c << "\n";
    a = b - c;
    cout << "a = b - c" << ", " << "a=" << a << "\n";
    cout << "b=" << b << "\n";
    cout << "c=" << c << "\n";
    a = b - (float)5.;
    cout << "a = b - 5." << ", " << "a=" << a << "\n";
    cout << "b=" << b << "\n";
    cout << "c=" << c << "\n";
    a = b - 5;
    cout << "a = b - 5" << ", " << "a=" << a << "\n";
    cout << "b=" << b << "\n";
    cout << "c=" << c << "\n";
#endif
    b += b;
    cout << "b += b" << ", " << "b=" << b << "\n";
    b *= b;
    cout << "b *= b" << ", " << "b=" << b << "\n";
    b /= (float) 5.;
    cout << "b /= 5." << ", " << "b=" << b << "\n";
    c *= (float) 5.;
    cout << "c *= 5." << ", " << "c=" << c << "\n";
    cout << "c[2]=" << c[2] << "\n";
    c[2]=99.;
    cout << "c[2]=99." << ", " << "c=" << c << "\n";
    cout << "(b==c=)" << (b==c) << "\n";
    cout << "(b!=c=)" << (b!=c) << "\n";
    cout << "b.dot(c)=" << b.dot(c) << "\n";
    cout << "c.dot(b)=" << c.dot(b) << "\n";
    return 0;
}
!EOF!
ls -l tst.c
echo x - tst.cmp
sed 's/^X//' > tst.cmp << '!EOF!'
init, a=(0,0,0,0)
init, b=(1,1,1,1)
init, c=(4,3,2,1)
a=19., a=(19,19,19,19)
a=c, a=(4,3,2,1)
a = b + c, a=(5,4,3,2)
b=(1,1,1,1)
c=(4,3,2,1)
a = b - c, a=(-3,-2,-1,0)
b=(1,1,1,1)
c=(4,3,2,1)
a = b - 5., a=(-4,-4,-4,-4)
b=(1,1,1,1)
c=(4,3,2,1)
a = b - 5, a=(-4,-4,-4,-4)
b=(1,1,1,1)
c=(4,3,2,1)
b += b, b=(2,2,2,2)
b *= b, b=(4,4,4,4)
b /= 5., b=(0.8,0.8,0.8,0.8)
c *= 5., c=(20,15,10,5)
c[2]=10
c[2]=99., c=(20,15,99,5)
(b==c=)0
(b!=c=)1
b.dot(c)=111.2
c.dot(b)=111.2
!EOF!
ls -l tst.cmp
echo x - vec4.h
sed 's/^X//' > vec4.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
#include "6_15h.h"
!EOF!
ls -l vec4.h
echo x - vec4all.h
sed 's/^X//' > vec4all.h << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
#include "6_15h2.h"
#include "6_15h3.h"
#include "6_15h4.h"
#include "6_15h5.h"
#include "6_15h6.h"
#include "6_15h7.h"
#include "6_15h8.h"
#include "6_15h9.h"
#include "6_15h10.h"
#include "6_15h11.h"
#include "6_15h12.h"
#include "6_15h13.h"
#include "6_15h14.h"
#include "6_15h15.h"
#include "6_15h16.h"
#include "6_15h17.h"
#include "6_15h18.h"
#include "6_15h19.h"
#include "6_15h20.h"
#include "6_15h21.h"
!EOF!
ls -l vec4all.h
# The following exit is to ensure that extra garbage 
# after the end of the shar file will be ignored.
exit 0