hello world

最新推荐文章于 2024-07-01 09:09:28 发布

alex_mianmian

最新推荐文章于 2024-07-01 09:09:28 发布

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分类专栏： hello world

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本文提供了一段C++代码，用于演示如何倒序句子里的单词，包括整体句子和每个单词的倒序。通过两轮反转操作实现目标。

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This is a new start.

many code from the blogs can't work actually. So I post some really working code.

1. code to reverse the words in a sentence. ----- 倒序句子里的单词。

The idea is:

"ab cd" ---> "dc ba" ----> "dc"+"ba" ----> "cd"+"ab"

The first time is reversing the all items(letters+space) in whole sentence, the second time is reverse the letters of each word.

#include <stdio.h>
#include <string.h>
char * invert(char *start, char *end) 
{ 
char tmp, *ptmp = start; 
while (start != NULL && end != NULL && start < end) 
{ 
tmp = *start; 
*start = *end; 
*end = tmp; 
start ++; 
end --; 
} 
return ptmp; 
} 

void reverse_word(char* string)
{
int len=strlen(string);
char* input_string=NULL;
char* start_pos=NULL;
invert(string,string+len-1);
input_string = string;
while(*input_string != '\0'){
if(start_pos ==NULL){
start_pos=input_string;
}
if(*input_string==' '){
invert(start_pos,input_string-1);
start_pos=NULL;
}
input_string++;
}
invert(start_pos,input_string-1);
}
int main(int argc,char** argv)
{
char mytest_string[]="abcdefghijk is my word";

reverse_word(mytest_string);
printf("%s\n",mytest_string);
return 0;

}