Czytam plik z liczbami. Do programu sortowania i poszukiwania

/*
Vladimir Poplavskij. Wykladowca
* -----------------
* Read file.
* -----------------
2022-12-05
*/

#include <stdio.h>
#include <errno.h>

#define MAX_LINE_LENGTH 1000

int main(void) {
	FILE *fptr;
	int number, i = 0, arr[MAX_LINE_LENGTH];

	fptr = fopen("random.dat", "r");

	if (fptr != NULL) {
            printf("File opened successfully!\n");
	} else {
            printf("Failed to read the file.\n");
            return -1;
	}

	while ( fscanf(fptr, "%d", &number ) == 1 ) {
		arr[i] = number;
		printf("We just read %d\n", arr[i]);
		i++;
	}

	fclose(fptr);
	return 0;
}