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This article mainly explains "how to use python, php or c language to achieve string flipping". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to use python, php or c language to realize string flipping".

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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