The Big Programming Thread - Page 682

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Thread Rules
1. This is not a "do my homework for me" thread. If you have specific questions, ask, but don't post an assignment or homework problem and expect an exact solution.
2. No recruiting for your cockamamie projects (you won't replace facebook with 3 dudes you found on the internet and $20)
3. If you can't articulate why a language is bad, don't start slinging shit about it. Just remember that nothing is worse than making CSS IE6 compatible.
4. Use [code] tags to format code blocks.

WarSame

Canada1950 Posts

November 26 2015 01:59 GMT

#13621

Well I have 2 friends that are working there, and they said that it's a pretty good company to work for, so I have a bit more faith than otherwise. Plus, I didn't do an internship(kids, do internships!) so my experience is limited, and I'm very low on cash. All of those raise my tolerance. But yeah, seeing those types of questions did not make me happy, especially when Java isn't my main language. Like who the fuck would know that answer offhand?

Animzor

Sweden2154 Posts

November 26 2015 07:05 GMT

#13622

Quick question(C++):

is this:

char* name;

the same as this?

char *name;

Manit0u

Poland17588 Posts

November 26 2015 07:39 GMT

#13623

On November 26 2015 07:48 WarSame wrote:
For example, one question asked - in what version did Java release Enum. I know Enums are a fairly basic class so I assumed they were released in the initial version, 1.0. They were released in 5.0 - released in 2004.

Stuff like that always reminds me how not really modern the modern languages can be. When you think about it, lambda expressions and anonymous functions became the rage fairly recently and then you realize that Lisp had it all in the 60's...

On November 26 2015 16:05 Animzor wrote:
Quick question(C++):

is this:

Show nested quote +

the same as this?

Show nested quote +

Yes. You can even write it as "char * name". At least it used to be like that so you better get a second opinion here.

Deleted User 101379

4849 Posts

November 26 2015 08:31 GMT

#13624

On November 26 2015 16:05 Animzor wrote:
Quick question(C++):

is this:

Show nested quote +

the same as this?

Show nested quote +

It is the same. There are just different opinions on where the asterisk should go.

char* name; // name is a variable of the type pointer-to-char
char *name; // name is a pointer to data of type char
char * name; // I'm bad at making decisions

Some people prefer to think of it the first way while others think of it the second way. I think the more common and accepted way is "char *name", because it makes multiple declarations less ambiguous:

char *name1, name2; // name1 is a pointer to char, name2 is a char (not a pointer)
char *name1, *name2; // name1 and name2 are pointers to char

Side node: Avoid combining declarations, especially when pointers are involved. It doesn't improve performance or memory footprint, it just makes it harder to read the code.

tofucake

Hyrule19188 Posts

November 26 2015 13:31 GMT

#13625

yeah putting the asterisk with the variable is the way I prefer because there isn't a type of char-pointer. It's best to be as explicit as possible when declaring.

solidbebe

Netherlands4921 Posts

November 26 2015 16:12 GMT

#13626

Meh I prefer it the other way around. I like to think of it as character-pointer called name

Gowerly

United Kingdom916 Posts

November 26 2015 16:16 GMT

#13627

I do the * on the type rather than the variable name.
But then that's because I never declare more than one variable on a line. I find it aids readability if things are separate.

mantequilla

Turkey781 Posts

November 26 2015 17:48 GMT

#13628

N00B to javascript world here. Are these analogous?

npm install ~ mvn install
package.json ~ pom.xml
grunt ~ mvn compile
gulp ~ ???
bower ~ ???

spinesheath

Germany8679 Posts

November 26 2015 20:39 GMT

#13629

On November 26 2015 22:31 tofucake wrote:
yeah putting the asterisk with the variable is the way I prefer because there isn't a type of char-pointer. It's best to be as explicit as possible when declaring.

I don't think that's right.

From the C++ standard:

9.3.2 The this pointer

In the body of a non-static (9.3) member function, the keyword this is a prvalue expression whose value is the address of the object for which the function is called. The type of this in a member function of a class X is X*. If the member function is declared const, the type of this is const X*, if the member function is declared volatile, the type of this is volatile X*, and if the member function is declared const volatile, the type of this is const volatile X*. [ Note: thus in a const member function, the object for which the function is called is accessed through a const access path. —end note ]

So it clearly says that "X*" is a type. Now obviously this excerpt talks about classes rather than chars, but I'd wager that the same thing applies for char* or any other pointer. At the very least usage suggests that pointers are types: when you typecast a pointer you include the asterisk.

Blisse

Canada3710 Posts

November 26 2015 21:31 GMT

#13630

You're pretty much all wrong. You should be using smart pointers in C++

Manit0u

Poland17588 Posts

November 26 2015 23:10 GMT

#13631

On November 27 2015 02:48 mantequilla wrote:
N00B to javascript world here. Are these analogous?

npm install ~ mvn install
package.json ~ pom.xml
grunt ~ mvn compile
gulp ~ ???
bower ~ ???

Please don't confuse JavaScript with Java. The tools you mentioned in theory serve the same purpose but they're totally different beast.

Also:

npm install -> this one is used to install node dependencies and run them in order (like getting bower and gulp and then running them)
bower install -> this thing grabs your javascript dependences according to the settings, if it finds conflicts (like 2 scripts requiring incompatible jQuery packages) it asks you to choose between available versions. I think it also does that for css but I'm not 100% sure (been a long time since I did any frontend work)
gulp -> merges, compiles, minifies and uglifies your assets provided by the other two

Usually in the project it's like that:

npm install (grab bower and gulp and execute the following commands - based on package.json) -> bower install (grab all the js and css requirements for your package - based on something) -> gulp (compile sass/less to css, compile javascripts, merge everything, do some magic, put asset images and scripts in the right folders etc. - based on gulpfile.js).

I believe that Grunt and Bower and/or Gulp are interchangeable.

solidbebe

Netherlands4921 Posts

November 27 2015 00:15 GMT

#13632

HP is giving me headaches

Im trying to set up a win7/ubuntu dualboot (single drive) on my HP laptop, got both installed but I cant boot from ubuntu now. In the boot menu i can only select boot from drive which goes into win7. I cheched out all the bios settings but nothing apparent that might help.

Anyone got any ideas??

Ropid

Germany3557 Posts

November 27 2015 00:39 GMT

#13633

If this is a modern laptop with UEFI, there's a FAT32 partition with the boot loaders on it. You could move things around in there to fix it if your problem is that Windows has overwritten the Ubuntu boot loader.

The UEFI's boot menu can also be edited to add several boot loaders from that partition to it. That can be done through the "efibootmgr" tool.

I'll take a look at my stuff here locally and type up something more about what's going on and how to do work on it from within the environment you have when you boot the Ubuntu installation media and go to its desktop.

Manit0u

Poland17588 Posts

November 27 2015 01:06 GMT

#13634

Yeah, I remember that introducing UEFI caused problems with dual-booting. The very first thing you should try is installing the systems in the right order (that's Windows first and Linux second). It's because no matter what you do Windows will shove itself into MBR and screw up your setup. Another way around it is pretty oldschool (having a boot disk with you at all times) so I won't even suggest it

Ropid

Germany3557 Posts

November 27 2015 01:09 GMT

#13635

Check this out, I have Windows on a separate drive and I'm inspecting what's going on there from my Linux drive:

Here's the partitions of my first drive which is the one with Windows on it:

$ sudo parted /dev/sda print
Model: ATA Samsung SSD 840 (scsi)
Disk /dev/sda: 250GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name  Flags
 1      17.4kB  134MB   134MB                      msftres
 2      135MB   450MB   315MB   ntfs               diag
 3      450MB   555MB   105MB   fat32              boot, esp
 4      555MB   69.3GB  68.7GB  ntfs               msftdata
 5      69.3GB  250GB   181GB   ntfs               msftdata

Partition number three is the EFI partition. Let's mount it and take a look at it:

$ mkdir temp

$ sudo mount /dev/sda3 temp

$ cd temp

$ tree .
.
└── EFI
    ├── Acronis
    │   ├── asrm.efi
    │   └── asrm.xml
    ├── Boot
    │   └── bootx64.efi
    └── Microsoft
        └── Boot
            ├── BCD
            ├── BCD.LOG
            ├── BCD.LOG1
            ├── BCD.LOG2
            ├── bg-BG
            │   ├── bootmgfw.efi.mui
            │   └── bootmgr.efi.mui
            ├── bootmgfw.efi
            ├── bootmgr.efi
            ├── BOOTSTAT.DAT
            ├── boot.stl
            ├── cs-CZ
            │   ├── bootmgfw.efi.mui
            │   ├── bootmgr.efi.mui
            │   └── memtest.efi.mui
            ├── da-DK
            │   ├── bootmgfw.efi.mui
 ... a lot of files ...
44 directories, 126 files

That "EFI/Boot/bootx64.efi" file is the default boot loader. That's the file that gets loaded by the UEFI if you didn't configure anything special. For me here, it's a copy of a file in the Microsoft folder. See here:

$ diff -s EFI/Boot/bootx64.efi EFI/Microsoft/Boot/bootmgfw.efi 
Files EFI/Boot/bootx64.efi and EFI/Microsoft/Boot/bootmgfw.efi are identical

I assume Ubuntu uses the grub boot loader. You probably see it somewhere in its own folder on the drive. You should compare files with diff and see if the Ubuntu installation has overwritten the EFI/Boot/bootx64.efi file or if it's still the Microsoft file. I hope it's the Microsoft file and you can just copy the grub one over it and then things are working. It's not scary as you have the original in the Microsoft folder to copy back if needed.

There's a tool "efibootmgr" that can edit a list that's in the UEFI. That list has at first just that one entry for the default boot loader file, but you can add a bunch more to it. Those added entries should then show up in the boot menu of the UEFI. The "efibootmgr" tool is weird and I forgot how to use it. Also, I bet HP has issues in its UEFI and disregards what you would do with the efibootmgr tool. That's perhaps the reason that Ubuntu doesn't boot.

EDIT: The Archwiki has an article about one particular HP laptop:

https://wiki.archlinux.org/index.php/HP_EliteBook_840_G1

Even if UEFI, Arch Linux and (e.g.) GRUB are correctly configured and with the correct UEFI NVRAM variables set, the system will not boot from the HDD/SSD. The problem is that HP hard coded the paths for the OS boot manager in their UEFI boot manager to \EFI\Microsoft\Boot\bootmgfw.efi to boot Microsoft Windows, regardless of how the UEFI NVRAM variables are changed.

Great work by HP's programmers.

The article explains that this particular laptop has a BIOS update that introduced a setting named "customized boot" where you can enter the path+filename to an alternative boot loader.

Manit0u

Poland17588 Posts

November 27 2015 02:25 GMT

#13636

And what if you would swap your Linux boot with the Windows one but keep the name of the file same as Windowsy stuff?

Ropid

Germany3557 Posts

November 27 2015 07:37 GMT

#13637

Yeah, worst case you might have to overwrite the file in the "/EFI/Microsoft" folder. I hope that's not the case because then you would have to research how to still be able to boot Windows (perhaps reading up on manually editing the grub boot loader's config files so that it finds a renamed Microsoft file).

A thing I forgot is "SecureBoot". That has to be disabled for alternative boot loaders to work, though there was something about Ubuntu supposedly being able to work with it enabled.

Nesserev

Belgium2760 Posts

November 27 2015 08:27 GMT

#13638

--- Nuked ---

mantequilla

Turkey781 Posts

November 27 2015 08:37 GMT

#13639

On November 27 2015 08:10 Manit0u wrote:

Show nested quote +

Inserting required css and javascript files into HTML document's head is done by hand, or with one of these build tools?

Manit0u

Poland17588 Posts

November 27 2015 09:27 GMT

#13640

On November 27 2015 17:37 mantequilla wrote:

Show nested quote +

Inserting required css and javascript files into HTML document's head is done by hand, or with one of these build tools?

By hand. You do something like that:


<link href="/assets/css/compiled.css" rel="stylesheet" type="text/css">
<script src="/assets/js/compiled.js"></script>

Now, you don't really have those files. All you have are unprocessed stylesheets and javascripts in non-public folder:


private/
    sass/
        forms.sass
        layout.sass
        typography.sass
        ui.sass
    js/
        custom.js
        ui.js

Now, launching bower + gulp (via npm) will perform those steps:

1. Download jquery, angular, bootstrap, pace js and css (and whatever elese you need)
2. Compile your sass to css
3. Merge all css into a single file, minify and output it into /assets/css/compiled.css
4. Merge all js, minify, uglify and output it into /assets/js/compiled.js

This way you really link only a single file somewhere in your layout and don't have to worry about it since all the assets will be compiled into them. You just have to run npm install after deployment. During development you might need to run gulp manually each time your js/css changes unless you have an IDE in which you can set up file watchers to do it for you automatically in the background upon file save (jetbrains products have such a feature).

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