#!/bin/sh
# This is a shar archive.
# The rest of this file is a shell script which will extract:
#
# 6_7.c 6_7.cmp 6_7a.c 6_7tst.c makefile
#
# 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 23:08:20 EDT 1990
#
echo x - 6_7.c
sed 's/^X//' > 6_7.c << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// Exercise 6.7
// print out the conversions and
// values for each expression
#include <stream.h>

struct X
{
    int i;

    X(int in)
    {
	cout << "converting int " << in << " to X\n";
	i = in;
    }

    operator+(int in)
    {
	cout << "adding X " << i << " + int " << in << "\n";
	int ret = i + in;
	cout << "op+(X,int) returns " << ret << "\n";
	return ret;
    }
};

struct Y
{
    int i;

    Y(X Xin)
    {
	cout << "converting X " << Xin.i << " to Y\n";
	i = Xin.i;
    }

    operator+(X Xin)
    {
	cout << "adding Y " << i << " to X " <<
	    Xin.i << "\n";
	int ret = i + Xin.i;
	cout << "op+(Y,X) returns " << ret << "\n";
	return ret;
    }

    operator int()
    {
	cout << "converting Y " << i <<
	    " to int\n";
	return i;
    }
};

XX operator* (X Xin, Y Yin)
{
    cout << "multiplying X " << Xin.i << " times Y " <<
	Yin.i << "\n";
    X Xout(Xin.i * Yin.i);
    cout << "op*(X, Y) returns " << Xout.i << "\n";
    return Xout;
}

int f(X Xin)
{
    cout << "calling f(X = " << Xin.i << ")\n";
    return Xin.i;
}

XX x = 1;
Y y = x;
int i = 2;

main()
{
    int ret = i + 10;
    cout << "i + 10 = " << ret << "\n";

    ret = y + 10;
    cout << "y + 10 = " << ret << "\n";

    ret = y + 10 * y;
    cout << "y + 10 * y = " << ret << "\n";

    ret = x + y + i;
    cout << "x + y + i = " << ret << "\n";

    ret = x * x + i;
    cout << "x * x + i = " << ret << "\n";

    ret = f(7);
    cout << "f(7) = " << ret << "\n";

//  illegal conversion
//  ret = f(y);
//  cout << "f(y) = " << ret << "\n";

    ret = y + y;
    cout << "y + y = " << ret << "\n";

    ret = 106 + y;
    cout << "106 + y = " << ret << "\n";
    return 0;
}
!EOF!
ls -l 6_7.c
echo x - 6_7.cmp
sed 's/^X//' > 6_7.cmp << '!EOF!'
converting int 1 to X
converting X 1 to Y
i + 10 = 12
converting int 10 to X
adding Y 1 to X 10
op+(Y,X) returns 11
y + 10 = 11
converting int 10 to X
multiplying X 10 times Y 1
converting int 10 to X
op*(X, Y) returns 10
adding Y 1 to X 10
op+(Y,X) returns 11
y + 10 * y = 11
converting Y 1 to int
adding X 1 + int 1
op+(X,int) returns 2
x + y + i = 4
converting X 1 to Y
multiplying X 1 times Y 1
converting int 1 to X
op*(X, Y) returns 1
adding X 1 + int 2
op+(X,int) returns 3
x * x + i = 3
converting int 7 to X
calling f(X = 7)
f(7) = 7
converting Y 1 to int
converting Y 1 to int
y + y = 2
converting Y 1 to int
106 + y = 107
!EOF!
ls -l 6_7.cmp
echo x - 6_7a.c
sed 's/^X//' > 6_7a.c << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
struct X {
    int i;
    X(int);
    operator+(int);
};

struct Y {
    int i;
    Y(X);
    operator+(X);
    operator int();
};

XX operator* (X, Y);
int f(X);

XX x = 1;
Y y = x;
int i = 2;

main()
{
    i + 10;
    y + 10;
    y + 10 * y;
    x + y + i;
    x * x + i;
    f(7);
    f(y);
    y + y;
    106 + y;
}
!EOF!
ls -l 6_7a.c
echo x - 6_7tst.c
sed 's/^X//' > 6_7tst.c << '!EOF!'
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
/* Copyright (c) 1990 by AT&T Bell Telephone Laboratories, Incorporated. */
/* The C++ Answer Book */
/* Tony Hansen */
/* All rights reserved. */
// Exercise 6.7
// print out the conversions and
// values for each expression
#include <stream.h>

struct X
{
    int i;

    X(int in)
    {
	cout << "converting int " << in << " to X\n";
	i = in;
    }

    operator+(int in)
    {
	cout << "adding X " << i << " + int " << in << "\n";
	int ret = i + in;
	cout << "op+(X,int) returns " << ret << "\n";
	return ret;
    }
};

struct Y
{
    int i;

    Y(X Xin)
    {
	cout << "converting X " << Xin.i << " to Y\n";
	i = Xin.i;
    }

    operator+(X Xin)
    {
	cout << "adding Y " << i << " to X " <<
	    Xin.i << "\n";
	int ret = i + Xin.i;
	cout << "op+(Y,X) returns " << ret << "\n";
	return ret;
    }

    operator int()
    {
	cout << "converting Y " << i <<
	    " to int\n";
	return i;
    }
};

XX operator* (X Xin, Y Yin)
{
    cout << "multiplying X " << Xin.i << " times Y " <<
	Yin.i << "\n";
    X Xout(Xin.i * Yin.i);
    cout << "op*(X, Y) returns " << Xout.i << "\n";
    return Xout;
}

int f(X Xin)
{
    cout << "calling f(X = " << Xin.i << ")\n";
    return Xin.i;
}

XX x = 1;
Y y = x;
int i = 2;

main()
{
    int ret = i + 10;
    cout << "i + 10 = " << ret << "\n";

    ret = y + 10;
    cout << "y + 10 = " << ret << "\n";

    ret = y + 10 * y;
    cout << "y + 10 * y = " << ret << "\n";

    ret = x + y + i;
    cout << "x + y + i = " << ret << "\n";

    ret = x * x + i;
    cout << "x * x + i = " << ret << "\n";

    ret = f(7);
    cout << "f(7) = " << ret << "\n";

//  illegal conversion
//  ret = f(y);
//  cout << "f(y) = " << ret << "\n";

    ret = y + y;
    cout << "y + y = " << ret << "\n";

    ret = 106 + y;
    cout << "106 + y = " << ret << "\n";
    return 0;
}
!EOF!
ls -l 6_7tst.c
echo x - makefile
sed 's/^X//' > makefile << '!EOF!'
CC= CC -I. -I../../CC

all: 6_7

6_7: 6_7.c
	$(CC) 6_7.c -o 6_7

CMP= 6_7.cmp
OUT= 6_7.out

6_7.out: 6_7 ;	6_7 > 6_7.out

test: all $(OUT) $(CMP)
	cmp 6_7.out 6_7.cmp
	echo tests done
!EOF!
ls -l makefile
# The following exit is to ensure that extra garbage 
# after the end of the shar file will be ignored.
exit 0