C语言结构体里的成员数组和指针

struct test{
    int i;
    char *p;
};

 struct test *str;
    int a = 1;
    char *b = "ioiodddddddddddd";

    str = (struct test *)malloc(sizeof(struct test));//结构体指针不为null
    str->i = a;
    str->p = b;
    printf("%s\n",str->p);  //输出ioiodddddddddddd
return 1;

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struct test{
    int i;
    char s[10];
};

struct test *str;
str = (struct test *)malloc(sizeof(struct test));//结构体指针不为null
printf("%x\n",str);         //输出 72403170
printf("%x\n",str->s);      //输出 72403174
return 1;