Could be. Do you have any programming experience?
-
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Programming |OT| C is better than C++! No, C++ is better than C
- Thread starter Kikarian
- Start date
Yeah a bit of Java and have used R a fair amount too which may or may not count. All self taught though so if imaging I have some terrible habits.
You might find a bunch of it too introductory then. I'd recommend trying the official tutorial and go back to LPTHW if it's too confusing.
Cool, thanks for your help.
I need some help with the glut/opengl 2.1 api. It's for an intro class and I'm having trouble determining what needs changed.
The issue I'm having is that I'm trying to display a model using perspective viewing, but I can't get the model to display correctly. When I use glOrtho() I get a very nice view of it.
When I change Ortho to Frustum(), keeping the same parameters I get this.
i've tried adjusting the near and far clipping planes but it doesn't seem to help. If the near is positive it clips part of the cube and if its negative it looks like the above image.
I've tried using gluperspective as well but its either a blank screen or I can barely see parts of the cube. I'm trying to learn how to use it from the projections program here http://user.xmission.com/~nate/tutors.html, but none of my changes seem to make any sense in comparison with their program. Anyone have any ideas?
Here's the display sample code I'm messing with.
edit: I think I found the issue. One thing I was trying to do was use gluLookAt to move the camera back, but any changes to it didnt seem to do anything. Then I realized that I called loadIdentity, so my gluLookAt gets overwritten. I've commented out the sections where it's called but feel it's not exactly a good thing to do. My model is displaying properly now at least, but I need to figure out where I would want to put changing the perspective/camera movement.
edit2: alright after some googling I figured out how to place everything. Working well now. Now to add normals and lighting to make it not look awful.
The issue I'm having is that I'm trying to display a model using perspective viewing, but I can't get the model to display correctly. When I use glOrtho() I get a very nice view of it.
When I change Ortho to Frustum(), keeping the same parameters I get this.
i've tried adjusting the near and far clipping planes but it doesn't seem to help. If the near is positive it clips part of the cube and if its negative it looks like the above image.
I've tried using gluperspective as well but its either a blank screen or I can barely see parts of the cube. I'm trying to learn how to use it from the projections program here http://user.xmission.com/~nate/tutors.html, but none of my changes seem to make any sense in comparison with their program. Anyone have any ideas?
Here's the display sample code I'm messing with.
Code:
void myReshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h)
glOrtho(-2.0, 2.0, -2.0 * (GLfloat) h / (GLfloat) w,
2.0 * (GLfloat) h / (GLfloat) w, -10, 10.0);
else
glOrtho(-2.0 * (GLfloat) w / (GLfloat) h,
2.0 * (GLfloat) w / (GLfloat) h, -2.0, 2.0, -10, 10);
glMatrixMode(GL_MODELVIEW);
}edit: I think I found the issue. One thing I was trying to do was use gluLookAt to move the camera back, but any changes to it didnt seem to do anything. Then I realized that I called loadIdentity, so my gluLookAt gets overwritten. I've commented out the sections where it's called but feel it's not exactly a good thing to do. My model is displaying properly now at least, but I need to figure out where I would want to put changing the perspective/camera movement.
edit2: alright after some googling I figured out how to place everything. Working well now. Now to add normals and lighting to make it not look awful.
lorebringer
Member
Is there a reason you want something C++ based specifically? The two best general algorithm books out there right now in my opion are Algorithms by Robert Sedgewick, which uses Java and Introduction to Algorithms by Cormen et. al. which uses a python like psuedo code which is very easy to translate into your choice of imperative language. There are C/C++ specific books but I don't know of any that match the above for quality and breadth of coverage and I never found it all that helpful personally to learn algorithms through specific languages, usually a clean psuedocode works best for me.
If you want C++ stuff to help improve your own C++ I would recommend you read one of the above and also take a look at any or all of Scott Meyer's Effective series, Effective C++, More Effective C++ and Effective STL
Right now i'm programming with unity and C# and i have a problem which i can't resolve or find anything in the internet.
So, first I have a class called StandardRoom which will load a room-prefab (it's just an empty gamobject with enemies). in there, it will create a floor and doors, playe them an put them as a child. so far so good, it is all displayed correctly in the inspector when i start it.
Then I have the class LevelCreator, which will randomly use StandardRoom to create rooms for the level. creating this room will work, but i can't use room.transform.find() to get the child I'm looking floor.
here is the code:
and levelcreator:
Solution: I called setupDoors in the Start()-funktion. After calling it manually it worked.
So, first I have a class called StandardRoom which will load a room-prefab (it's just an empty gamobject with enemies). in there, it will create a floor and doors, playe them an put them as a child. so far so good, it is all displayed correctly in the inspector when i start it.
Then I have the class LevelCreator, which will randomly use StandardRoom to create rooms for the level. creating this room will work, but i can't use room.transform.find() to get the child I'm looking floor.
here is the code:
Code:
class StandardRoom{
void setupDoors ()
{
GameObject floorPrefab = (GameObject)Resources.Load("Level1/Floor");
GameObject floorInst = Instantiate(floorPrefab, transform.position, Quaternion.identity)as GameObject;
floorInst.name = "Floor";
Transform floor = floorInst.transform;
floor.parent = this.transform;
}
}and levelcreator:
Code:
public GameObject createLevel(int numberOfRooms)
{
Object[] standardrooms = Resources.LoadAll("Level1/StandardRooms");
GameObject prefabRoom = (GameObject)standardrooms[Random.Range(0, standardrooms.Length)];
GameObject room = Instantiate (prefabRoom, transform.position, Quaternion.identity) as GameObject;
Transform floor = room.transform.Find("Floor");
Debug.Log("bounds: " + floor);
}Solution: I called setupDoors in the Start()-funktion. After calling it manually it worked.
Thanks, that's a great link. I ended up finding some info on Reddit of all places too. It's for graduates specifically, but it's still at least as good a data point as Glassdoor.
I don't have much experience with it, but it seems that a lot of tools that I use are written in Erlang. Chef, RabbitMQ, CouchDB... seems like something I should learn eventually. Maybe someone else can comment on how marketable a skill it is.
Is there any easy and clean looking syntax for comparing multiple values against each other in Java? Right now I have something like this.
But I feel like that's a lot more complicated and "ugly" than it needs to be. I'm imaging something like the below, where each variable on the left would be compared with each variable on the right except for itself.
Code:
if( T != O && T != G && T != D && O != G && O != D && G != D)
//I'd like to apologize to the programming gods for using O as a varaibleBut I feel like that's a lot more complicated and "ugly" than it needs to be. I'm imaging something like the below, where each variable on the left would be compared with each variable on the right except for itself.
Code:
if( T,O,G,D != T,O,G,D)I don't think there is. The clean way to do it is to encapsulate that comparison in an appropriately named method (ie. not named O
. However, this might have changed with 8.What are you getting when calling room.transform.find("Floor");?
Also, is Floor a direct child of Room?
thanks for the suggestions. i may look into the effective c++ books later, but i have decided to go with this book instead http://www.amazon.com/Data-Structures-Using-D-Malik/dp/0324782012/ref=sr_1_3?s=books&ie=UTF8&qid=1410844776&sr=1-3&keywords=malik+c%2B%2B+data
lorebringer
Member
This is something that's very easy to do in a language with clean literal syntax for common collections. You're out of luck here really, the closest thing to this I can think of is to throw all the variables in a Set and then check the size.
Code:
if (new HashSet<>(Arrays.asList(T, O, G, D)).size() == 4) {
// no values are equal to each other yay
}Outside of the class it returns nothing, not even null. Inside the class it returns Floor.
In the standardroom class i create floor and set standardroom as a parent. When I run it, it shows Floor as a child of this class in the class hirarchy.
I also tried to save Floor.renderer.bounds.size in a variable, but when I call get(), it just returns 0.
Working in bash, and this is the first time I have ever used linux.... Don't know what is wrong because the error messages are so damn cryptic that I don't know where to look to fix this. Just keep getting
syntax error near unexpected token 'in
' case "$choice" in"
I am supposed to eventually make this into a loop, but right now I am trying to get the program to even run.
syntax error near unexpected token 'in
' case "$choice" in"
I am supposed to eventually make this into a loop, but right now I am trying to get the program to even run.
Code:
#!/bin/bash
echo "1. Add a contact"
echo "2. Remove a contact"
echo "3. Find a contact"
echo "4. List all contacts"
echo "5. Exit the program"
read -p "Please enter selection: " choice
case "$choice" in
1)
read -p "Enter a name: " firstname lastname
read -p "Enter an email address: " email
if grep -fxq "$firstname $lastname" contacts.dat
then
echo "$firstname $lastname, $email" >> contacts.dat
continue
else
echo "There is already an entry for $firstname $lastname"
fi
;;
2)
cat contacts.dat
read -p "Enter a name: " firstname lastname
sed -e s/$firstname $lastname//g -i *
;;
3)
cat contacts.dat
read -p "Enter a name: " firstname lastname
results=$(grep "$firstname $lastname" contacts.dat)
echo results
;;
4)
sort --k2=2 contacts.dat
;;
5)
exit
;;
*)
echo "Please enter a valid choice"
;;
esacSniperHunter
Banned
has anyone used or gone through the book, "C++ for beginners" what did you guys think of it?
I am mostly going through the book to learn C++, it is very math based. Is it a good idea to learn multiple languages?? what languages are in demand at the moment? I need a proper structure
I am mostly going through the book to learn C++, it is very math based. Is it a good idea to learn multiple languages?? what languages are in demand at the moment? I need a proper structure
Tried copy pasting your code and it works fine for me:
Code:
> ./test.sh
1. Add a contact
2. Remove a contact
3. Find a contact
4. List all contacts
5. Exit the program
Please enter selection:...or at least executed, didn't go much further than that.
Code:
> bash --version
GNU bash, version 4.1.10(4)-release (i686-pc-cygwin)Which version of bash are you using? And are you sure it's not a symlink to another shell, like sh?
my trouble is when I try to do an option I keep getting the same error, no matter which option I try.
no idea what version I am using. I am pretty new to linux and am remoted into the schools linux system.
Really strange. I just copied the script and it worked perfectly, catching the case. Just erroring out at the choice since the files didn't exist. Can you screenshot what happens when you run it?
Everything I've seen for that error is that it's not supported by the shell. You're sure you're using bash and not sh?
Can you run "cat /etc/shells" and make sure /bin/bash shows up there? It might be a slightly different shell to run.
oh yeah, or run it with bash instead of sh, lol. Should've noticed that.
Or just ./step_prog1.sh should run too.
Can you run "cat /etc/shells" and make sure /bin/bash shows up there? It might be a slightly different shell to run.
oh yeah, or run it with bash instead of sh, lol. Should've noticed that.
Or just ./step_prog1.sh should run too.
Laurentius
Member
Try "bash prog1.sh" instead of "sh prog1.sh".
The above replies are correct, you're using sh instead of bash there.
Considering you're using a #!/bin/bash shebang there, you should be able to call the file directly if you make it executable.
Run:
and you should be able to run it by calling it directly:
I also recommend changing your shebang from #!/bin/bash to #!/usr/bin/env bash
Relevant information:
- Difference between sh and bash
- Preferred bash shebang?
Considering you're using a #!/bin/bash shebang there, you should be able to call the file directly if you make it executable.
Run:
Code:
sudo chmod +x prog1.shand you should be able to run it by calling it directly:
Code:
./prog1.shI also recommend changing your shebang from #!/bin/bash to #!/usr/bin/env bash
Relevant information:
- Difference between sh and bash
- Preferred bash shebang?
I'm stumped on this. My only guess would be related to scope, and that your trying to access floor from somewhere that it isn't defined.
If you figure it out, please be sure to update with your solution.
Elfforkusu
Member
What platforms does /bin/bash not work on?
I don't usually quote myself, but...
Retyped everything in vim and have it working now....previously I typed it in notepad++ and apparently that isn't the way to go. I couldn't figure anything out because I guess there were hidden carriage returns I wasn't seeing and what not. Either way thanks for all your help.
I was just getting extremely frustrated not being able to get anything running. The teacher said we could use whatever text editor we would like, didn't specify it had to be a Linux text editor...
I was just getting extremely frustrated not being able to get anything running. The teacher said we could use whatever text editor we would like, didn't specify it had to be a Linux text editor...
You can see newlines in notepad++ with View > Show Symbol > Show All Characters. [1]
To choose the newline format of a new document, choose Settings -> Preferences -> New Document/Default Directory -> New Document -> Format -> Windows/Mac/Unix
For an already-open document choose Edit -> EOL Conversion [2]
1. http://stackoverflow.com/q/14682329
2. http://stackoverflow.com/q/8195839
Non-Linux Unix (e.g. BSD) systems often don't even have bash installed by default. The last OpenBSD box I was on did have it installed, but since it was user-installed it was on /usr/local/bin.
Granted, there is the possibility of env not being there either, or not being in /usr/bin, but that's less common in my experience.
In any case, there's good arguments for/against #!/bin/bash and #!/usr/bin/env bash, so that's why I said I recommended it instead of saying it was necessary. If you're being security conscious, #!/bin/bash is probably better. Then again, if you're that concerned over security, you probably aren't worried about portability and could do with just removing the shebang entirely.
One thing we should all agree on is not to use #!/bin/sh even if yours is symlinked to bash.
Also, for future reference, if you want to check for invisible characters in vim, use
Code:
:set listGlad you solved the issue!
dragonelite
Member
Any recommended books or tutorials i can follow to get up to speed with ASP.net MVC?
Just graduated and a lot of local jobs have C# and ASP.net in their needed skillset.
Just graduated and a lot of local jobs have C# and ASP.net in their needed skillset.
When is setupDoors() being called? You will have to call that explicitly before you attempt to find the floor. If you call it in the Awake() method of StandardRoom, that might be called as soon as you Instantiate it, but to be absolutely sure you should just call it directly before you need it.
Hopefully one of you guys can help me out here, I'm taking an intro to python programming class this semester and the assignment I'm currently working on requires me to loop until a form a table of radii, circumferences, and areas from radius 1 to 10. I have the loop working perfectly, it's just the display is wonky. Here's my code
When I run it I get this:
I'm sure I made a super simple goof, it would just help to have a fresh pair of eyes take a look.
Code:
import math
def main():
rad=0
pi = float(math.pi)
print('Radius \t \t Area\t \t Circumference')
for radius in range (1,11):
rad+=1
cir = float(2*pi*rad)
area = float(pi*rad**2)
print(format(rad,'.3f'), '\t', '\t',format(area,'.3f'),'\t','\t', format(cir,'.3f'))
main()When I run it I get this:
I'm sure I made a super simple goof, it would just help to have a fresh pair of eyes take a look.
It looks like you're running into the tab boundaries, so when a number gets too many digits, it pushes it to the next tab. I moved the area down to .2f and it put half the list in line, but once it got too many digits, it moved it again.
Might need to mess with the formatting a bit more.
I messed around and got a proper looking format by inserting and removing some spaces.
Can throw that format(rad,'.3f') back in there, but I personally think it's superfluous since they're all integers. Either way, the format still works.
Might need to mess with the formatting a bit more.
I messed around and got a proper looking format by inserting and removing some spaces.
Code:
import math
def main():
rad = 0
pi = float(math.pi)
print('Radius \t\t Area \t\t Circumference')
for radius in range (1,11):
rad+=1
cir = float(2*pi*rad)
area = float(pi*rad**2)
print(rad, '\t','\t',format(area,'.3f'),' \t', format(cir,'.3f'))
main()Can throw that format(rad,'.3f') back in there, but I personally think it's superfluous since they're all integers. Either way, the format still works.
lorebringer
Member
This is happening because you are using tabs to space out the table. You can see that the two lines that are indenting too far left are the lines that have less than 6 characters in the area column. I think the cleanest way to sort this out is to just use spaces for indentation and use the fill specifier for format.
Code:
def main():
rad = 0
pi = float(math.pi)
print('{: <13}{: <13}{: <13}'.format('Radius', 'Area', 'Circumference'))
for radius in range(1, 11):
rad += 1
cir = float(2*pi*rad)
area = float(pi*rad**2)
print('{: <13.3f}{: <13.3f}{: <13.3f}'.format(rad, area, cir))These examples use the format string syntax, indent left and space to a minimum of 13 spaces.
Thank you, I knew it was an easy fix I'm just sick as hell right now so my brain don't work too good. My professor wants all the numbers formatted to 3 decimal spaces for some reason, that's the only reason I had the radii formatted like that.
Thank you for this, I will definitely look into learning more about this concept.
Oh wow. I had it in the Start()-funktion. I just called it manually and it worked. Thank you very much!
Laurentius
Member
You can also use the dos2unix tool. It should resolve newline issues if you're copying files written on Windows to Unix or Linux.
Technosteve
Banned
To the guy that suggested Rubymines for Ruby on Rails IDE, thanks. It's very good.
You're welcome. JetBrains rocks!
Moral Panic
Member
Any ios developers here? Where their any changes to ARC in ios 8? My references aren't being kept in my popover and I can't find out out what changes were made from 7.1 where it works perfectly.
Rust is great. It's a "best of" collection of features from contemporary programming languages with C++'s attitude towards zero-cost abstractions and Haskell's devotion to memory safety as overriding concerns. Its most distinctive feature is its lifetime system, which has previously only appeared in a research language called Cyclone. It operates through a combination of linear types and region-based memory management to guarantee memory safety and data-race safety without garbage collection. Rust also makes a number of other choices to eliminate undefined behavior. Because it's starting from scratch, it is also able to correct some C++ misfeatures: it replaces the Turing-complete template parser with type-safe generics and hygienic macros, has proper type inference (not quite Hindley-Milner but nearly the same in practice), has a real module system, abandons the malloc / free API by using RAII to guarantee sized deallocations, and has aliasing semantics that basically make every pointer "restrict." It has lots of other features, too, but those are the big ones that I think make it a clear win over C++.
While it won't hit 1.0 until the end of this year, the core language is stable enough that you shouldn't be afraid of starting personal projects in it. I'd be happy to answer any specific questions you or anyone else on GAF has about the language, but failing that the IRC channel and subreddit are both very good resources.
What's the newest language that's managed to become popular and widely used? Certainly it seems like there would be a lot of momentum keeping currently popular languages from being replaced, even if newer languages were better.
Anyway, Rust looks interesting to me as well, especially since it's "multi-paradigm". I'm not really a fan of this whole "object-oriented" thing so far.
Anyway, Rust looks interesting to me as well, especially since it's "multi-paradigm". I'm not really a fan of this whole "object-oriented" thing so far.
Wow! Thanks for the write up. In my limited exposure to programming as a whole, C is easily my favorite language. Mostly I like the level at which it sites in abstraction, still very close to the hardware and OS. But it really shows it's age, and it's frusterating despite it also being super rewarding.
I never found C++ to my liking, nor Java, or C#. Just too bulky of languages and so often you get constrained under the weight of IDEs, and dependency resolution. I have NEVER successfully deployed C++ or Java, and only once did I have a deployable C# project.
But I love C and I'm frusterated by interpretated scripting languages and I ESPECIALLY HATE dynamic typing so Python was never as appealing in reality as when people pitched it to me.
Haskell and Go immediatly jumped out to me amongst the bunch, and recently I've taken to teaching myself Haskell. It's really challenging my views of what a language should be, and what a language can be. Super enjoyable and refreshing. GHCI is also a great side option.
But yeah I'll have to look into Rust, it sounds like everything I want in a language. I'm so tired of writing things in C89. Too much trouble to work with C99 or C++11.
Udacity's nanodegrees are starting. Got an email to apply for the front-end web dev one.
I hope these turn out to be good in both curriculum and job seeking opportunity.
The last year and a half I have learned a lot, but I keep jumping around subjects, everything from Android development to Ruby. I'm hoping these structured outlines in the nanodegrees will help me focus my learning better.
I hope these turn out to be good in both curriculum and job seeking opportunity.
The last year and a half I have learned a lot, but I keep jumping around subjects, everything from Android development to Ruby. I'm hoping these structured outlines in the nanodegrees will help me focus my learning better.