IPC SystemV Shared memory

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#define SHMSIZE 4
#define ARRAY_ELEM 10

int main(int argc, char *argv[])
{
    pid_t pid;
    key_t key;
    int shmid;
    pid = fork();
    if (pid == -1)
    {
        perror("fork");
        exit(EXIT_FAILURE);
    }
    else if (pid == 0)
    {

        int *ptr;
        key = ftok(".", 1);
        shmid = shmget(key, sizeof(int) * ARRAY_ELEM, IPC_CREAT | 0755);
        ptr = shmat(shmid, NULL, 0);
        for (int i = 0; i < ARRAY_ELEM; i++)
            ptr[i] = i * 11;
        printf("Child int pointer address: %p\n", ptr);
        shmdt(ptr);
        return 0;
    }
    else if (pid > 0)
    {
        wait(NULL);
        int *ptr;
        key = ftok(".", 1);
        shmid = shmget(key, sizeof(int) * ARRAY_ELEM, 0755);
        ptr = shmat(shmid, NULL, 0);
        printf("Parent int pointer address: %p\n", ptr);
        for (int i = 0; i < ARRAY_ELEM; i++)
            printf("Shared memory value: %d\n", ptr[i]);
        shmdt(ptr);
//        shmctl(shmid, IPC_RMID, NULL);
    }
    return 0;
}