C语言--把一个字符串的内容逆序

    把一个字符串的内容逆序输出

#include<stdio.h>
#include<assert.h>
#include<string.h>
char * my_change(char*srt1,int k)
{
    char *ret = srt1;
    char *start = srt1;
    char *end = srt1 + k - 1;
    char tmp;
    while (start < end)
    {
        tmp = *start;
        *start = *end;
        *end = tmp;
        start++;
        end--;
    }
    return ret;
}
int main(void)
{
    char arr[10] = "abcdef";
    int k = strlen(arr);
    printf("%s\n", my_change(arr,k));
    system("pause");
}