/*
**?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?*/

int	read_column_numbers（?int?columns[]?int?max?）;
void	rearrange（?char?*output?char?const?*input
	????int?n_columns?int?const?columns[]?）;

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?		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?copy
		**?what?will?fit.
		*/
		if（?output_col?+?ncha

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----
?????文件???????????0??2017-11-01?10:50??C鍜屾寚閽?
?????文件????????6148??2018-01-22?14:44??C鍜屾寚閽?.DS_Store
?????目錄???????????0??2018-01-29?20:06??__MACOSX\
?????文件???????????0??2018-01-29?20:06??__MACOSX\C鍜屾寚閽?
?????文件?????????120??2018-01-22?14:44??__MACOSX\C鍜屾寚閽?._.DS_Store
?????文件????29967827??2015-03-15?18:55??C鍜屾寚閽?C鍜屾寚閽?pdf
?????文件?????????223??2015-03-15?18:55??__MACOSX\C鍜屾寚閽?._C鍜屾寚閽?pdf
?????文件???????????0??2017-11-01?10:50??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?
?????文件????????6148??2018-01-22?14:44??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?.DS_Store
?????文件???????????0??2018-01-29?20:06??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?
?????文件?????????120??2018-01-22?14:44??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?._.DS_Store
?????目錄???????????0??2018-01-05?17:31??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\
?????目錄???????????0??2009-04-03?23:10??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch9\
?????文件?????????397??1997-06-20?11:45??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch9\token.c
?????目錄???????????0??2018-01-29?20:06??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\
?????目錄???????????0??2018-01-29?20:06??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch9\
?????文件?????????223??1997-06-20?11:45??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch9\._token.c
?????文件?????????882??1997-06-20?11:45??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch9\mstrrstr.c
?????文件?????????223??1997-06-20?11:45??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch9\._mstrrstr.c
?????文件?????????214??1997-06-20?11:45??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch9\strlen.c
?????文件?????????223??1997-06-20?11:45??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch9\._strlen.c
?????文件?????????187??2009-04-03?23:10??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\._ch9
?????目錄???????????0??2009-04-03?23:10??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch7\
?????文件?????????437??1997-06-20?11:45??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch7\find_int.c
?????目錄???????????0??2018-01-29?20:06??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch7\
?????文件?????????223??1997-06-20?11:45??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch7\._find_int.c
?????文件?????????342??1997-06-20?11:45??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch7\average1.c
?????文件?????????223??1997-06-20?11:45??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch7\._average1.c
?????文件?????????376??1997-06-20?11:45??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch7\fib_iter.c
?????文件?????????223??1997-06-20?11:45??__MACOSX\C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch7\._fib_iter.c
?????文件?????????344??1997-06-20?11:45??C鍜屾寚閽?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀錛誨畬鏁寸増錛?c鍜屾寚閽堜唬鐮佸強(qiáng)絳旀\ch7\clrarray.c
............此處省略256個(gè)文件信息