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/*【解题思路】 | |
c语言,char指针来对字符串进行操作,先找到尾指针,然后前后in place交换。 | |
【时间复杂度】 | |
O(N) | |
【空间复杂度】 | |
O(1) | |
【gist link】 | |
https://gist.github.com/LinyinWu/a8fc47eef2993e3bc749 | |
【test】 | |
hello | |
(空) | |
hello world | |
*/ | |
#include<stdio.h> | |
#include<stdlib.h> | |
#include<string.h> | |
void reverseString(char * str) { | |
if(str == NULL) | |
return; | |
char* end = str; | |
while(*end != '\0') { | |
end++; | |
} | |
end--; | |
while(str<end) { | |
char temp = *str; | |
*str = *end; | |
*end = temp; | |
str++; | |
end--; | |
} | |
} | |
int main() { | |
char in[256]; | |
printf("enter the string:\n"); | |
fgets (in, sizeof(in), stdin); | |
if ((strlen(in)>0) && (in[strlen (in) - 1] == '\n')) | |
in[strlen (in) - 1] = '\0'; | |
char * str = in; | |
printf("before reverse: %s\n", in); | |
reverseString(str); | |
printf("after reverse: %s\n", in); | |
return 0; | |
} |
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