新手求助：使用指针实现字符串的逆序和去重

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

void delete_(char *);//删除重复
void reverse(char *);//逆序

int main(void)
{
    return 0;
}

void delete_(char *str)
{
    size_t lenth = strlen(str);
    size_t i = 1, j = 1, k = 0;

    for (; i < lenth; k = 0, i++)
    {
        while (k < i && str[i] != str[k])
            k++;
        if (k == i)
            str[j++] = str[i];
    }
    str[j] = '\0';
}

void reverse(char *str)
{
    for (size_t i = 0, lenth = strlen(str); i < lenth / 2; i++)
    {
        char temp = str[i];
        str[i] = str[lenth - i - 1];
        str[lenth - i - 1] = temp;
    }
}

[此贴子已经被作者于2019-3-6 15:19编辑过]

#include <stdio.h>
int main()
{
    char *p, *s="AA11BB22CC33DD44EE55";
    char a[128]= {0};
    for (p=s; *p; ++p);
    for (--p; p>=s; --p)
    {
        if (!a[*p])
        {
            printf("%c", *p);
            a[*p] = 1;
        }
    }
    return 0;
}