C语言，分别用字符数组和字符指针作函数参数两种方法编程实现字符串

Question

C语言，分别用字符数组和字符指针作函数参数两种方法编程实现字符串逆序存放功能。

Answer 1

#include <stdio.h>
#include <string.h>
#include <malloc.h>

void niXuArr(char arr[]);
char * niXuPoint(char *p);

int main(void)
{
char arr[] = {"abcdefghigk"}, *p = "you are the first";
printf("逆序前：%s\n逆序后：", arr);
niXuArr(arr);
printf("%s\n", arr);

printf("逆序前：%s\n逆序后：", p);

p = niXuPoint(p);
printf("%s\n", p);
return 0;
}

void niXuArr(char arr[])
{
int i = 0;
char temp = 0;

for(i = 0; i < strlen(arr) / 2; i++)
{
temp = arr[i];
arr[i] = arr[strlen(arr) - 1 - i];
arr[strlen(arr) - 1 - i] = temp;
}
}

char * niXuPoint(char *p)
{
char *pHead = NULL, *pTail = NULL, temp = 0;

int i = 0;

pHead = (char*)malloc(strlen(p));
pTail = p + strlen(p) - 1;
p = pHead;

for(i = 0; i < strlen(p); i++)
{
*pHead++ = *pTail--;
}

*pHead = '\0';

return p;
}