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

struct node
{
    int x;
    int y;
    int z;

    char name[21];
};
typedef struct node node_t;

void mymemset(void *mem, char c, unsigned int n)
{
    char *p = (char *) mem;

    while (n--)
        *p++ = c;
}

void func(int arr[])
{
    printf("the size of arr is: %lu\n", sizeof(arr));
    arr[0] = 9;
}

int main(int argc, char *argv[])
{
    node_t *p = (node_t *) malloc(sizeof(node_t) + 21); /* c99 */
    strcpy(p->name, "I have a long name");

    printf("%s", p->name);

    int myarr[] = { 1,2,3,4,5,6,7,8,9,10 };
    func(myarr);

    printf("%d\n", myarr[0]);

    mymemset(p, -1, sizeof(node_t));

    return 0;
}