/******************************************************
Name: reverse_str.c
Copyright: kernelxu
Author: kernelxu
Date: 29-08-05 12:10
Description: reverse astring allocated in an array
将一个存储在数组中的字符串倒置。
My E_mail: kernelxu@hotmail.com
******************************************************/
#include <stdio.h>
#include <string.h> void reverse_str(char * ch);
void reverse_str2(char *ch); int main(void)
{
char c[] = "Can you reverse me?"; printf("original string c: \n%s\n", c);
reverse_str(c);
printf("reversed string after calling reverse_str: \n%s\n", c);
reverse_str2(c);
printf("reversed string after calling reverse_str2: \n%s\n", c);
system("pause"); return 0;
} void reverse_str(char *ch) /*使用中间变量*/
{
int len;
int i;
len = strlen(ch)-1;
char ctemp; for(i = 0; i < len-i; i++)
{
ctemp = ch[i];
ch[i] = ch[len-i];
ch[len-i] = ctemp;
}
ch[len+1] = 0; } void reverse_str2(char *ch) /*不用中间变量*/
{
int len;
int i;
len = strlen(ch)-1;
char ctemp; for(i = 0; i < len-i; i++)
{
ch[i] = ch[i] ^ ch[len-i];
ch[len-i] = ch[i] ^ ch[len-i];
ch[i] = ch[i] ^ ch[len-i];
}
ch[len+1] = 0;
}
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