Flexible array member

flexibleArray.c

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

#define BUFFLEN 10
typedef struct example *PtrToExample;
struct example{
  int a;
  int p[0];
};

int main(){
    PtrToExample P = (PtrToExample)malloc(sizeof(struct example)+sizeof(int) * BUFFLEN);
    //memset(P,0, sizeof(struct example)+BUFFLEN);

    if (P == NULL)
        exit(1);

    P->a = 100;

    for (int i = 0; i < BUFFLEN; i++){
        P->p[i] = i;
    }

    for (int i = 0; i < BUFFLEN; i++)
        printf("%d\n", P->p[i]);

    printf("%d\n", P->a);

    free(P);
    return 0;
}