字符串反转

#include <stdio.h>

void reverse(char *s)
{
    int len = 0;
    char *p = s;
    while(*p != '\0')
    {
        len++;
        p++;
    }
    int i= 0;
    char temp;
    while(i<=(len/2-1))
    {
        temp = *(s+i);
        *(s+i) = *(s+len-1-i);
        *(s+len-1-i) = temp;
        i++;
    }

}

int main()
{
    char test[1000];
    printf("please input string:\n");
    scanf("%s",test);
    reverse(test);
    printf("%s\n",test);
}