The fscanf function is weird

int* Load_File(void) {

    FILE * fp;

    fp = fopen("Birthday.txt", "r");
    int idx;
    int arr[100];

    for (idx = 0; idx < 58; idx++) {

        fscanf(fp, "%d\n", &arr[idx]);

        cout << arr[idx] << endl;
    }

    return arr;
}