How to use python, php or c language to realize string flipping
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Original title:
Q: there is an a.txt file, which contains the following 1234569 abcABCabc requirements: awk is required to print out the following result 987654321 cbaCBAcba
A:
Shell: [root@vps tmp] # rev a.txt 9654321 cbaCBAcba
Perl: [root@vps tmp] # perl-nle 'print scalar reverse $_;' a.txt 9654321 cbaCBAcba
Awk: [root@vps tmp] # awk'{num=split ($0djinarr, ""); for (iMagnum [I]) {printf arr [I]; if (iMagnum 1) {printf "\ n"}} 'a.txt 9654321 cbaCBAcba
Php: [root@vps tmp] # php-r'$fp=fopen ("a.txt", "r"); while (! feof ($fp)) {echo strrev (fgets ($fp,999));} echo "\ n";; '9654321 cbaCBAcba
Sed: [root@vps tmp] # sed'/\ n cbaCBAcba / (.\)\ (.\)\ (. *\ n\) / &\ 2\ 1
Python: (one of the methods)
> arr='hello'
> > arr [::-1]
'olleh'
(method 2)
> str='hello'
> tmp= "
> > for s in reversed (str):
... Tmp+=s
...
> print tmp
Olleh
Reverse.h
# ifndef _ reverse_h
Int getLine (char s [], int limit)
Void reverse (char s [])
# endif
Int getLine (char s [], int limit)
{
Int c,i
For (I = 0; ireverse.c)
# include "stdio.h"
# include "/ Users/chenqing/tmp/reverse.h"
# define MAXLINE 1000
/ *
Reverse a string use c langusge
, /
Int main (void)
{
Int len
Char line [MAXLINE]
If ((len = getLine (line,MAXLINE)) > 0) {
Reverse (line)
Printf ("% s", line)
}
Return 0
}
Gcc reverse.c-o reverse
Qing:tmp chenqing$ echo "ChinaCache" |. / reverse
EhcaCanihC above is an example of using these implementations to implement string flipping under the terminal command line.
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