Store an Array in shared memory c

sharedMemoryArray.c

// write.c
#include<stdio.h>
#include <sys/ipc.h> 
#include <sys/shm.h> 
#include <stdio.h>

int main(int argc, char const *argv[]) {
	int key = ftok(".", 34);
	int *arr;
	
	int shmid = shmget(key,sizeof(int)*5,0666|IPC_CREAT);

	arr = (int *)shmat(shmid, NULL, 0);
	int i;
	for(i=0; i<5; i++)
    	arr[i] = i*3;

	for(i=0; i<5; i++)
    	printf("%d\n", arr[i]);


    shmdt((void *) arr);
	return 0;
}

//read.c 
#include<stdio.h>
#include <sys/ipc.h> 
#include <sys/shm.h> 
#include <stdio.h>

int main(int argc, char const *argv[]) {
	int key = ftok(".", 34);
	int *arr;
	
	int shmid = shmget(key,sizeof(int)*5,0666|IPC_EXCL);

	arr = shmat(shmid, NULL, 0);

	int i;
	for(i=0; i<5; i++) 
        printf("%d\n", arr[i] );

    shmdt((void *) arr);
    shmctl(shmid, IPC_RMID, NULL);
	return 0;
}