/*
**?This?program?reads?input?lines?from?the?standard?input?and?prints
**?each?input?line?followed?by?just?some?portions?of?the?lines?to
**?the?standard?output.
**
**?The?first?input?is?a?list?of?column?numbers?which?ends?with?a
**?negative?number.??The?column?numbers?are?paired?and?specify
**?ranges?of?columns?from?the?input?line?that?are?to?be?printed.
**?For?example?0?3?10?12?-1?indicates?that?only?columns?0?through?3
**?and?columns?10?through?12?will?be?printed.
*/

#include?
#include?
#include?
#define	MAX_COLS	20	/*?max?#?of?columns?to?process?*/
#define	MAX_INPUT	1000	/*?max?len?of?input?&?output?lines?*/

#ifdef?R
int	read_column_numbers（?int?columns[]?int?max?）;
void	rearrange（?char?*output?char?const?*input
	????int?n_columns?int?const?columns[]?）;
#endif
int
main（?void?）
{
	int	n_columns;		/*?#?of?columns?to?process?*/
	int	columns[MAX_COLS];	/*?the?columns?to?process?*/
	char	input[MAX_INPUT];	/*?array?for?input?line?*/
	char	output[MAX_INPUT];	/*?array?for?output?line?*/

	/*
	**?Read?the?list?of?column?numbers
	*/
	n_columns?=?read_column_numbers（?columns?MAX_COLS?）;

	/*
	**?Read?process?and?print?the?remaining?lines?of?input.
	*/
	while（?gets（?input?）?!=?NULL?）{
		printf（?“Original?input?:?%s\n“?input?）;
		rearrange（?output?input?n_columns?columns?）;
		printf（?“Rearranged?line:?%s\n“?output?）;
	}

	return?EXIT_SUCCESS;
}

/*
**?Read?the?list?of?column?numbers?ignoring?any?beyond?the?specified
**?maximum.
*/
int
read_column_numbers（?int?columns[]?int?max?）
{
	int	num?=?0;
	int	ch;

	/*
	**?Get?the?numbers?stopping?at?eof?or?when?a?number?is?	*/
	while（?num?	????&&?columns[num]?>=?0?）
		num?+=?1;

	/*
	**?Make?sure?we?have?an?even?number?of?inputs?as?they?are
	**?supposed?to?be?paired.
	*/
	if（?num?%?2?!=?0?）{
		puts（?“Last?column?number?is?not?paired.“?）;
		exit（?EXIT_FAILURE?）;
	}

	/*
	**?Discard?the?rest?of?the?line?that?contained?the?final
	**?number.
	*/
	while（?（ch?=?getchar（））?!=?EOF?&&?ch?!=?‘\n‘?）
		;

	return?num;
}

/*
**?Process?a?line?of?input?by?concatenating?the?characters?from
**?the?indicated?columns.??The?output?line?is?then?NUL?terminated.
*/
void?rearrange（?char?*output?char?const?*input
????int?n_columns?int?const?columns[]?）
{
	int	col;		/*?subscript?for?columns?array?*/
	int	output_col;	/*?output?column?counter?*/
	int	len;		/*?length?of?input?line?*/

	len?=?strlen（?input?）;
	output_col?=?0;

	/*
	**?Process?each?pair?of?column?numbers.
	*/
	for（?col?=?0;?col?	{?/*-=============11================-*/
		int	nchars?=?columns[col?+?1]?-?columns[col]?+?1;

		/*
		**?If?the?input?line?isn‘t?this?long?or?the?output
		**?array?is?full?we‘re?done.
		*/
		if（?columns[col]?>=?len?||
		????output_col?==?MAX_INPUT?-?1?）
			break;

		/*
		**?If?there?isn‘t?room?in?the?output?array?only?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???11599067??2006-10-13?13:39??C和指針\C和指針.pdf

?????文件???????3336??2008-02-08?08:58??C和指針\programs\ch1\rearrang.c

?????文件??????10052??2008-02-02?16:07??C和指針\programs\ch1\rearrang.exe

?????文件????????986??2008-02-02?16:07??C和指針\programs\ch1\rearrang.obj

?????文件??????10052??2008-02-02?16:07??C和指針\programs\ch1\tempfile.exe

?????目錄??????????0??2008-10-31?11:48??C和指針\programs\ch1

?????文件????????386??1997-06-20?11:45??C和指針\programs\ch11\alloc.c

?????文件????????234??1997-06-20?11:45??C和指針\programs\ch11\alloc.h

?????文件????????233??1997-06-20?11:45??C和指針\programs\ch11\a_client.c

?????文件???????1056??1997-06-20?11:45??C和指針\programs\ch11\invcreat.c

?????文件????????464??1997-06-20?11:45??C和指針\programs\ch11\invdelet.c

?????文件????????595??1997-06-20?11:45??C和指針\programs\ch11\inventor.h

?????文件???????1311??1997-06-20?11:45??C和指針\programs\ch11\sort.c

?????文件????????614??1997-06-20?11:45??C和指針\programs\ch11\strdup.c

?????目錄??????????0??2008-10-31?11:48??C和指針\programs\ch11

?????文件???????1792??1997-06-20?11:45??C和指針\programs\ch12\dll_ins1.c

?????文件????????692??1997-06-20?11:45??C和指針\programs\ch12\dll_ins2.c

?????文件????????284??1997-06-20?11:45??C和指針\programs\ch12\dll_ins3.c

?????文件???????1282??1997-06-20?11:46??C和指針\programs\ch12\dll_ins4.c

?????文件????????187??1997-06-20?11:45??C和指針\programs\ch12\dll_ins5.c

?????文件?????????86??1997-06-20?11:45??C和指針\programs\ch12\dll_node.h

?????文件????????927??1997-06-20?11:46??C和指針\programs\ch12\insert1.c

?????文件???????1106??1997-06-20?11:46??C和指針\programs\ch12\insert2.c

?????文件????????953??1997-06-20?11:46??C和指針\programs\ch12\insert3.c

?????文件?????????67??1997-06-20?11:45??C和指針\programs\ch12\sll_node.h

?????目錄??????????0??2008-10-31?11:48??C和指針\programs\ch12

?????文件????????331??1997-06-20?11:45??C和指針\programs\ch13\btoa.c

?????文件????????879??1997-06-20?11:45??C和指針\programs\ch13\cmd_line.c

?????文件????????340??1997-06-20?11:45??C和指針\programs\ch13\echo.c

?????文件????????205??1997-06-20?11:45??C和指針\programs\ch13\mystery.c

............此處省略111個文件信息