struct date {
        char day[80];
        int month;
        int year;
    };

    //Error a value of type "void*" cannot be used to initialize an entity of type "date*"
    struct date *object=malloc(sizeof(struct date));
    strcpy(object->day,"Good day");
    object->month=6;
    object->year=2013;
    FILE * file= fopen("output", "wb");

    if (file != NULL) {
        fwrite(object, sizeof(struct date), 1, file);
        fclose(file);
    }