The Big Programming Thread - Page 479

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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.

MichaelEU

Netherlands816 Posts

May 13 2014 07:56 GMT

#9561

Never touched VS either.

Just, like, write some code man.

Gowerly

United Kingdom916 Posts

May 13 2014 09:00 GMT

#9562

Depends on the language, for me.

I write Python in Notepad++ or a Python IDE.
I write C++ and C# in VS (VS 2012 at work, VS Express at home).

But it's whatever works for you, really.

mcc

Czech Republic4646 Posts

May 13 2014 09:21 GMT

#9563

I barely touched VS in uni. It is arguably the best IDE, but it has one rather big drawback - platform dependence. But if you are ok with Windows, it is the best choice for the languages it supports well. But I see no reason for it to be something you necessarily need to learn in school, it is easy enough to learn it later when needed.

IMlemon

Lithuania296 Posts

May 13 2014 10:31 GMT

#9564

I use IntelliJ for everything.

MysteryMeat1

United States3292 Posts

May 13 2014 10:55 GMT

#9565

I've been having a lot of trouble lately when it comes to scanners and java and reading tokens. The lecturer didn't really cover it in class, but i was wondering if double and ints can be classified as strings then how do we select just for strings. for example 23, as a double is written 23.0, as an int 23, and as a string "23". When it comes to strings how do I be selective. I've been dealing with this problem for the last couple of hours but in essence i have a ton of numbers and two words that come before hand. How do i just search for these two words, and save the line that comes after.

Edit: my first time posting in this thread, its not really hw help, just a clarification of a topic.

Shield

Bulgaria4824 Posts

May 13 2014 12:05 GMT

#9566

Do you need to convert data types? If yes, try:

Integer.toString(int) // returns String
Double.toString(double) // returns String

or opposite conversion:

Integer.parseInt(String) // returns int
Double.parseDouble(String) // returns double

To check if a word exists in a String, then:

stringInstance.contains(stringInstance2);

MysteryMeat1

United States3292 Posts

May 13 2014 12:35 GMT

#9567

an example of the data would be

name gender 0 0 0 0 00 0 0 0 0 0 0

and i want to search for the name and gender and then get the next line and store the zeros as a variable.

currently my set up is to ask the user for name and gender that they want. I return that, and in another method take that return and have it set equal

while (console.hasNext()) {
Line = console.next().toLowerCase();
Scanner lineScanner = new Scanner (Line);
if (Line.equals(nameInput)) {
Line = console.nextLine();
return Line;

as below. The problem with my method so far is that i can't Line to equal both name and Gender, or i can but no space between them.

if i do Line += console.next() i get nameGender when i want name Gender

the other problem is that line returns only gender and the 0 0 0 0 instead of everything

Lorizean

Germany1330 Posts

May 13 2014 12:52 GMT

#9568

How come nobody mentioned emacs or vim as an alternative to the fullblown IDEs?

With youcompleteme and project plugins for vim. I got everything I need for my c++ needs.

Learning vim was probably the best decision I ever made

nunez

Norway4003 Posts

May 13 2014 12:56 GMT

#9569

lorizean, i am with you buddy!
some vims, convenient plugins (using youcompleteme too), a fresh gcc, solarized theme and shades.

mcc

Czech Republic4646 Posts

May 13 2014 13:10 GMT

#9570

On May 13 2014 21:52 Lorizean wrote:
How come nobody mentioned emacs or vim as an alternative to the fullblown IDEs?

With youcompleteme and project plugins for vim. I got everything I need for my c++ needs.

Learning vim was probably the best decision I ever made

They can be if you can get
a) autocomplete
b) go to definition
c) find all references
d) as good debugging functionality as good IDE
The rest of what IDE offers is just a nice bonus and can be easily replaced/lived without on most projects

EDIT: autocomplete has to be really smart and well done

Ben...

Canada3485 Posts

May 13 2014 16:00 GMT

#9571

On May 13 2014 19:31 IMlemon wrote:
I use IntelliJ for everything.

Yup. I seldom use IDEs, but the times I do use them it is always JetBrains stuff. They make actual good IDEs that are fast and highly customizable. Most IDEs are awful in comparison, Visual Studio included. The only IDEs I typically will use are IDEA, PyCharm (not very often though, I usually just use Sublime for Python), and, on rare occasion, MARS, which is a MIPS IDE that isn't complete garbage like SPIM (though that is only for school). Outside of some GUI stuff or special cases, I don't see the point of ever using IDEs. Though I basically never work on Windows anymore because I prefer having the OS not get in the way of me doing work.

I'm at the point where I do the extreme majority of my programming in Sublime (modified to behave like Vim) or Vim now with a terminal. I find a text editor and a makefile much faster and easier to use than any IDE for anything other than GUI stuff (heck, even for some GUI stuff, like Swing, I find a text editor faster). For Web stuff, I use a plugin for Sublime and have a separate, extension-free version of Chrome used specifically for testing.

On an unrelated note, these new lambda functions in Java 8 seem kinda neat. They're not what I expected when I first read about lambda functions being added to Java, but nonetheless they are pretty neat. Nice and compact.

Blitzkrieg0

United States13132 Posts

May 13 2014 16:17 GMT

#9572

On May 13 2014 21:35 MysteryMeat1 wrote:
an example of the data would be

name gender 0 0 0 0 00 0 0 0 0 0 0

and i want to search for the name and gender and then get the next line and store the zeros as a variable.

currently my set up is to ask the user for name and gender that they want. I return that, and in another method take that return and have it set equal

while (console.hasNext()) {
Line = console.next().toLowerCase();
Scanner lineScanner = new Scanner (Line);
if (Line.equals(nameInput)) {
Line = console.nextLine();
return Line;

as below. The problem with my method so far is that i can't Line to equal both name and Gender, or i can but no space between them.

if i do Line += console.next() i get nameGender when i want name Gender

the other problem is that line returns only gender and the 0 0 0 0 instead of everything

Line += " " + console.next() will add a space to the String. Review String concatenation if you want more information about this matter.

the other problem is that line returns only gender and the 0 0 0 0 instead of everything

Line = console.nextLine();
return Line;

You are overwriting the Line String when you do this which is why you're losing the name. If you want to add on the gender and numbers then you need to do += instead. If you want it spaced then you'll have to use String concatenation again.

spinesheath

Germany8679 Posts

May 13 2014 17:26 GMT

#9573

On May 13 2014 22:10 mcc wrote:

Show nested quote +

Add an extensive set of warnings and code smells.
And refactorings, lots of them. Automatically suggested at appropriate places.
Good class hierarchy and deep value origin/destination inspection are awesome too.
Basically all the stuff Resharper does.

mcc

Czech Republic4646 Posts

May 13 2014 18:48 GMT

#9574

On May 14 2014 01:00 Ben... wrote:

Show nested quote +

Is there any proper support for things like I mentioned in my previous post that you can get working in non-IDE editor (RT code analysis so you have the go to definition, find all references and similar, and debugging) ? I was looking for some pleasant way to program on Linux, but all IDEs I tested were completely lacking and I am not willing to give up the comfort of all those tools just for my after-work programming.

As for lambdas in Java, well they finally copied them from C#

(not exactly). I cannot even imagine life without them last few years.

Nesserev

Belgium2760 Posts

May 13 2014 18:56 GMT

#9575

--- Nuked ---

sluggaslamoo

Australia4494 Posts

May 13 2014 21:45 GMT

#9576

On May 14 2014 03:48 mcc wrote:

Show nested quote +

As for lambdas in Java, well they finally copied them from C#

(not exactly). I cannot even imagine life without them last few years.

Or copied them from like, every other dynamic language that already has them...

On May 14 2014 03:48 mcc wrote:

Show nested quote +

Its more the fact that people who don't use those tools don't find those features necessary. Instead you just use the console, as it is much faster and more flexible.

If you need auto-complete and search functions and whatnot, you are really stuck with an IDE or heavily customized text editor like vim/emacs.

sluggaslamoo

Australia4494 Posts

May 13 2014 21:47 GMT

#9577

On May 14 2014 03:56 Nesserev wrote:

Show nested quote +

On May 13 2014 16:27 adwodon wrote:
+ Show Spoiler +

Well that comment made me laugh, that you think you must be such a well rounded developer who CS grads should aspire to, but you've never touched probably the most widely used IDE in mainstream industry. A CS course which doesn't give its graduates proper scope for industry is a bad course so just because you'd perhaps discovered your niche early and it didn't require VS then that's great for you but the majority of graduates aren't in that position and crippling them in industry by not allowing them good experience with a very popular IDE is just daft, you have a 3 year course which is more than enough time to give students experience with a wide range of tools and considering VS is free I see absolutely no reason to withhold that from them, they have time to spend a thousand hours learning emacs commands too, they can't still choose the righteous path of Unix, don't worry, your beliefs are safe.

It's nice that you're so narrow minded and find these things funny but a sad reflection on the mindset of many developers that they believe in hobbling the potential for individuals by limiting their experience and therefore their choice because of their own dogmas. A good course should teach graduates a range of things and prepare them for industry as that's where most of them will end up, there's already a worrying trend of graduates coming out with only Java experience and completely faceplanting at standard industry positions because they have a poor grasp of anything outside of this, making niche graduates is bad for everyone, giving them a little bit of a wide gamut of knowledge is far better than a narrow but in depth slice of the whole pie and its why companies like mine don't hire CS grads, despite being a software and hardware company, since most grads have no understanding of the hardware these days they make poor developers for anything that requires understanding of the hardware and its much easier to teach a physicist or electrical engineer to write good software (at least in UK, maybe other countries have better CS courses).

Wow, you really took that very personal...

I don't know if you've noticed, but the internet is a bad way to communicate feelings. I didn't mean it in any offensive way, hor was I talking down upon you, nor was I professing any personal dogmas in any way. It's weird how you judged my whole character on the basis of one sentence...

I just found it funny that I never had to use VS, but you said that it was a must... an IDE is just an IDE, another tool that can help you in your journey to writing the code that you want. Also, because I don't use VS, doesn't mean that I've nestled myself into some kind of niche branch.

In my opinion, and that's the same opinion of my university's department, students should be able to decide what IDE they personally want to use. Some students use VS, some Eclipse, etc. it's one big happy family. Of course students have to learn how to use IDE's, but that doesn't make VS a must.

It's a general rule when it comes to anything in CS: "You should be able to pick up any 'tool' in a very short amount of time." For example: If you always used MySQL, and you then have to switch over to PostgreSQL, then that shouldn't form a problem, just like going from Eclipse to Netbeans, VS or any other IDE. If I ever have to use VS for professional reasons, I don't foresee to have any problems, it's just another IDE (with a couple of different features).

I definitely understand the latter part of your 'rant', but that has nothing to do with me.

Yeah, using an IDE isn't any kind of special skill, it doesn't take more than a few days, of which most companies are more than willing to allow for you to just settle in.

Manit0u

Poland17799 Posts

May 13 2014 22:37 GMT

#9578

So, my friend asked me for help with some test at his university. They're doing some C++ and he's not a very good coder. I haven't touched C++ in ages but I think I solved the problem. Would any of you be so kind and review it for any major errors and how I could've done it better?

Problem: create a numeric array (template), get average and median of its members (or something like that, for sure there was something about templates so I guessed they had to use them).

Solution:


#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

template<class T>
double GetAverage(vector<T>& arr)
{
   T sum = T();
   int size = int(arr.size());

   for (int i = 0; i != size; ++i)
   {
       sum += arr[i];
   }

   return double(sum) / size;
}

template<class T>
double GetMedian(vector<T>& arr)
{
   double median;
   int size = int(arr.size());
   int n = size / 2;

   sort(arr.begin(), arr.end());

   median = size % 2 ? arr[n] : (arr[n - 1] + arr[n]) / 2;

   return median;
}

template<class T>
void PrintVector(vector<T>& arr)
{
   int size = int(arr.size());

   for (int i = 0; i < size; ++i)
   {
       cout << arr[i] << " ";
   }
}

template<class T>
void ParseVector(vector<T>& arr)
{
   cout << "Average and median of vector:" << endl;
   cout << "Vector: ";
   PrintVector(arr);
   cout << endl;
   cout << "Average: " << GetAverage(arr);
   cout << endl;
   cout << "Median: " << GetMedian(arr);
   cout << endl;
}

int main()
{
   vector<int> intVector { 100, 200, 400, 800, 500 };
   vector<float> floatVector { 1.3, 8.5, 9.2, 4.1, 3.7 };
   
   ParseVector(intVector);
   ParseVector(floatVector);
   
   return 0;
}

I know what it lacks for sure:
class definition, taking input from console, IOC, interfaces

But I'll let my friend figure this all out

nunez

Norway4003 Posts

May 13 2014 23:20 GMT

#9579

seems correct i think.
here i'm using accumulate, is_default_constructible and assert(check only if debug build).

disclaimer: had a couple of brews.

#include<algorithm>
#include<cassert>
#include<type_traits>
#include<vector>

template<class T> //if T is default constructible we can just take a vector
typename std::enable_if<
	std::is_default_constructible<T>::value,
	T
>::type avg(vector<T> const& v){ 
	auto size=v.size();
	assert(size>0);
	return std::accumulate(std::begin(v),std::end(v),T())/size; 
}

template<class T> //else we need initial value
T avg(vector<T> const& v, T const& i){ 
	auto size=v.size();
	assert(size>0);
	return std::accumulate(std::begin(v),std::end(v),i)/size; 
}

template<class T>
T med(vector<T>& v){
	auto size=v.size();
	assert(size>0); 
	auto tmp=size/2;
	std::sort(std::begin(v),std::end(v));
	return size%2?v[tmp]:((v[tmp-1]+v[tmp])/2); 
}

netherh

United Kingdom333 Posts

May 13 2014 23:22 GMT

#9580

GetAverage could be called GetMean (since median is also an average).

Use std::accumulate to sum a vector, and std::copy to print a vector. You can also use std::nth_element in the median function.

Use more C++11 features (at least use auto, and use range-based for if you don't go with accumulate and copy).

Consider making the median logic clearer (at least a comment, or maybe IsEvenSize and GetMean(val1, val2) functions (you could reuse GetAverage({val1, val2}), but that would be less efficient)).

I don't think your median function works with even numbers, because you divide two ints by 2 (an int), not 2.0 (a double).

Check the problem specifications: Are you sure you want to return doubles, not Ts (be aware of conversions that happen either way...)? What about empty vectors? What about input vectors with 1 item (does the median function still work?) Also see whether the inputs can overflow (i.e. you may be summing lots of large numbers).

Pass vectors by const reference. Consider copying the input vector in GetMedian before sorting, so you don't change the input vector itself.

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