sending array of integers via shared memory - c

Question

I've written a producer and consumer code wherein a character sequence written to shared memory from producer.c is read from consumer.c
But the problem occured when I tried to send integer array from producer.c via shared memory and read from consumer.c
producer.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <sys/mman.h>
int main(){
const int SIZE = 4096;
const char *Obj = "Shm";
int shm_fd;
void *ptr;
shm_fd = shm_open(Obj, O_CREAT | O_RDWR, 0666);
ftruncate(shm_fd, SIZE);
ptr = mmap(0, SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
if (ptr == MAP_FAILED)
{
printf("Map failed\n");
return -1;
}
fgets(ptr, SIZE, stdin);
printf("Producer: Writing the sequence to the shared-memory object is done! \n");
return 0;
}
consumer.c
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <sys/mman.h>
int main()
{
const int SIZE = 4096;
const char *Obj = "Shm";
int shm_fd;
void *ptr;
shm_fd = shm_open(Obj, O_RDONLY, 0666);
if (shm_fd == -1)
{
printf("Shared memory failed\n");
exit(-1);
}
ptr = mmap(0, SIZE, PROT_READ, MAP_SHARED, shm_fd, 0);
if (ptr == MAP_FAILED)
{
printf("Map failed\n");
exit(-1);
}
printf("Consumer: The output sequence is: %d", (int *)ptr);
if (shm_unlink(Obj) == -1)
{
printf("Error removing the shared memory object %s\n", Obj);
exit(-1);
}
return 0;
}